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  1. Article ; Online: SARS-CoV-2 immunity and reasons for non-vaccination among healthcare workers from eastern and northern Switzerland: results from a nested multicentre cross-sectional study.

    Albrecht, Selina / Grässli, Fabian / Cusini, Alexia / Brucher, Angela / Goppel, Stephan / Betschon, Elsbeth / Möller, J Carsten / Ortner, Manuela / Ruetti, Markus / Stocker, Reto / Vuichard-Gysin, Danielle / Besold, Ulrike / Risch, Lorenz / Von Kietzell, Matthias / Schlegel, Matthias / Vernazza, Pietro / Kuster, Stefan P / Kahlert, Christian R / Kohler, Philipp

    Swiss medical weekly

    2024  Volume 154, Page(s) 3734

    Abstract: Aims of the study: We aimed to assess the extent of SARS-CoV-2 humoral immunity elicited by previous infections and/or vaccination among healthcare workers, and to identify reasons why healthcare workers decided against vaccination.: Methods: This ... ...

    Abstract Aims of the study: We aimed to assess the extent of SARS-CoV-2 humoral immunity elicited by previous infections and/or vaccination among healthcare workers, and to identify reasons why healthcare workers decided against vaccination.
    Methods: This nested cross-sectional study included volunteer healthcare workers from 14 healthcare institutions in German-speaking Switzerland. In January 2021, SARS-CoV-2 vaccines were available for healthcare workers. In May and June 2022, participants answered electronic questionnaires regarding baseline characteristics including SARS-CoV-2 vaccination status (with one or more vaccine doses defined as vaccinated) and previous SARS-CoV-2 infections. Unvaccinated participants indicated their reasons for non-vaccination. Participants underwent testing for SARS-CoV-2 anti-spike (anti-S) and anti-nucleocapsid (anti-N) antibodies. Antibody prevalence was described across age groups. In addition, we performed multivariable logistic regression to identify baseline characteristics independently associated with non-vaccination and described reasons for non-vaccination.
    Results: Among 22,438 eligible employees, 3,436 (15%) participated; the median age was 43.7 years (range 16-73), 2,794 (81.3%) were female, and 1,407 (47.7%) identified as nurses; 3,414 (99.4%) underwent serology testing, among whom 3,383 (99.0%) had detectable anti-S (3,357, 98.3%) antibodies, anti-N (2,396, 70.1%) antibodies, or both (2,370, 69.4%). A total of 296 (8.6%) healthcare workers were unvaccinated, whereas 3,140 (91.4%) were vaccinated. In multivariable analysis, age (adjusted OR [aOR] 1.02 per year, 95% CI 1.01-1.03), being a physician (aOR 3.22, 95% CI 1.75-5.92) or administrator (aOR 1.88, 95% CI 1.27-2.80), and having higher education (aOR 2.23, 95% CI 1.09-4.57) were positively associated with vaccine uptake, whereas working in non-acute care (aOR 0.58, 95% CI 0.34-0.97), active smoking (aOR 0.68, 95% CI 0.51-0.91), and taking prophylactic home remedies against SARS-CoV-2 (aOR 0.42, 95% CI 0.31-0.56) were negatively associated. Important reasons for non-vaccination were a belief that the vaccine might not have long-lasting immunity (267/291, 92.1%) and a preference for gaining naturally acquired instead of vaccine-induced immunity (241/289, 83.4%).
    Conclusions: Almost all healthcare workers in our cohort had specific antibodies against SARS-CoV-2 from natural infection and/or from vaccination. Young healthcare workers and those working in non-acute settings were less likely to be vaccinated, whereas physicians and administrative staff showed higher vaccination uptake. Presumed ineffectiveness of the vaccine is an important reason for non-vaccination.
    MeSH term(s) Humans ; Switzerland ; Cross-Sectional Studies ; COVID-19/prevention & control ; COVID-19/immunology ; Health Personnel/statistics & numerical data ; Female ; Male ; COVID-19 Vaccines/immunology ; SARS-CoV-2/immunology ; Adult ; Middle Aged ; Antibodies, Viral/blood ; Vaccination/statistics & numerical data ; Young Adult ; Adolescent ; Immunity, Humoral ; Surveys and Questionnaires ; Aged
    Chemical Substances COVID-19 Vaccines ; Antibodies, Viral
    Language English
    Publishing date 2024-04-13
    Publishing country Switzerland
    Document type Journal Article ; Multicenter Study
    ZDB-ID 2036179-8
    ISSN 1424-3997 ; 1424-7860
    ISSN (online) 1424-3997
    ISSN 1424-7860
    DOI 10.57187/s.3734
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Clinical symptoms of SARS-CoV-2 breakthrough infection during the Omicron period in relation to baseline immune status and booster vaccination-A prospective multicentre cohort of health professionals (SURPRISE study).

    Kohler, Philipp / Babouee Flury, Baharak / Güsewell, Sabine / Egger, Thomas / Leal, Onicio / Brucher, Angela / Lemmenmeier, Eva / Meier Kleeb, Dorette / Möller, J Carsten / Ortner, Manuela / Rieder, Philip / Ruetti, Markus / Schmid, Hans-Ruedi / Stocker, Reto / Vuichard-Gysin, Danielle / Speer, Oliver / Wiggli, Benedikt / Besold, Ulrike / McGeer, Allison /
    Risch, Lorenz / Friedl, Andrée / Schlegel, Matthias / Vernazza, Pietro / Kahlert, Christian R / Kuster, Stefan P

    Influenza and other respiratory viruses

    2023  Volume 17, Issue 6, Page(s) e13167

    Abstract: The effects of different types of pre-existing immunity on the frequency of clinical symptoms caused by the SARS-CoV-2 breakthrough infection were prospectively assessed in healthcare workers during the Omicron period. Among 518 participants, hybrid ... ...

    Abstract The effects of different types of pre-existing immunity on the frequency of clinical symptoms caused by the SARS-CoV-2 breakthrough infection were prospectively assessed in healthcare workers during the Omicron period. Among 518 participants, hybrid immunity was associated with symptom reduction for dizziness, muscle or limb pain and headache as compared to vaccination only. Moreover, the frequencies of dizziness, cough and muscle or limb pain were lower in participants who had received a booster vaccine dose. Thus, hybrid immunity appeared to be superior in preventing specific symptoms during breakthrough infection compared to vaccination alone. A booster vaccine dose conferred additional symptom reduction.
    MeSH term(s) Humans ; COVID-19/prevention & control ; SARS-CoV-2 ; Breakthrough Infections ; Dizziness ; Prospective Studies ; Vaccination ; Health Personnel ; Pain ; Vaccines
    Chemical Substances Vaccines
    Language English
    Publishing date 2023-06-19
    Publishing country England
    Document type Multicenter Study ; Journal Article
    ZDB-ID 2274538-5
    ISSN 1750-2659 ; 1750-2640
    ISSN (online) 1750-2659
    ISSN 1750-2640
    DOI 10.1111/irv.13167
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Post-Acute Sequelae After Severe Acute Respiratory Syndrome Coronavirus 2 Infection by Viral Variant and Vaccination Status: A Multicenter Cross-Sectional Study.

    Kahlert, Christian R / Strahm, Carol / Güsewell, Sabine / Cusini, Alexia / Brucher, Angela / Goppel, Stephan / Möller, Elisabeth / Möller, J Carsten / Ortner, Manuela / Ruetti, Markus / Stocker, Reto / Vuichard-Gysin, Danielle / Besold, Ulrike / McGeer, Allison / Risch, Lorenz / Friedl, Andrée / Schlegel, Matthias / Vernazza, Pietro / Kuster, Stefan P /
    Kohler, Philipp

    Clinical infectious diseases : an official publication of the Infectious Diseases Society of America

    2023  Volume 77, Issue 2, Page(s) 194–202

    Abstract: Background: Disentangling the effects of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) variants and vaccination on the occurrence of post-acute sequelae of SARS-CoV-2 (PASC) is crucial to estimate and reduce the burden of PASC.: Methods! ...

    Abstract Background: Disentangling the effects of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) variants and vaccination on the occurrence of post-acute sequelae of SARS-CoV-2 (PASC) is crucial to estimate and reduce the burden of PASC.
    Methods: We performed a cross-sectional analysis (May/June 2022) within a prospective multicenter healthcare worker (HCW) cohort in north-eastern Switzerland. HCWs were stratified by viral variant and vaccination status at time of their first positive SARS-CoV-2 nasopharyngeal swab. HCWs without positive swab and with negative serology served as controls. The sum of 18 self-reported PASC symptoms was modeled with univariable and multivariable negative-binomial regression to analyze the association of mean symptom number with viral variant and vaccination status.
    Results: Among 2912 participants (median age: 44 years; 81.3% female), PASC symptoms were significantly more frequent after wild-type infection (estimated mean symptom number: 1.12; P < .001; median time since infection: 18.3 months), after Alpha/Delta infection (0.67 symptoms; P < .001; 6.5 months), and after Omicron BA.1 infections (0.52 symptoms; P = .005; 3.1 months) versus uninfected controls (0.39 symptoms). After Omicron BA.1 infection, the estimated mean symptom number was 0.36 for unvaccinated individuals versus 0.71 with 1-2 vaccinations (P = .028) and 0.49 with ≥3 prior vaccinations (P = .30). Adjusting for confounders, only wild-type (adjusted rate ratio [aRR]: 2.81; 95% confidence interval [CI]: 2.08-3.83) and Alpha/Delta infections (aRR: 1.93; 95% CI: 1.10-3.46) were significantly associated with the outcome.
    Conclusions: Previous infection with pre-Omicron variants was the strongest risk factor for PASC symptoms among our HCWs. Vaccination before Omicron BA.1 infection was not associated with a clear protective effect against PASC symptoms in this population.
    MeSH term(s) Female ; Humans ; Adult ; Male ; COVID-19/complications ; SARS-CoV-2 ; Cross-Sectional Studies ; Prospective Studies ; Disease Progression ; Vaccination
    Language English
    Publishing date 2023-03-09
    Publishing country United States
    Document type Multicenter Study ; Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1099781-7
    ISSN 1537-6591 ; 1058-4838
    ISSN (online) 1537-6591
    ISSN 1058-4838
    DOI 10.1093/cid/ciad143
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Impact of respirator versus surgical masks on SARS-CoV-2 acquisition in healthcare workers: a prospective multicentre cohort.

    Haller, Sabine / Güsewell, Sabine / Egger, Thomas / Scanferla, Giulia / Thoma, Reto / Leal-Neto, Onicio B / Flury, Domenica / Brucher, Angela / Lemmenmeier, Eva / Möller, J Carsten / Rieder, Philip / Rütti, Markus / Stocker, Reto / Vuichard-Gysin, Danielle / Wiggli, Benedikt / Besold, Ulrike / Kuster, Stefan P / McGeer, Allison / Risch, Lorenz /
    Schlegel, Matthias / Friedl, Andrée / Vernazza, Pietro / Kahlert, Christian R / Kohler, Philipp

    Antimicrobial resistance and infection control

    2022  Volume 11, Issue 1, Page(s) 27

    Abstract: Background: There is insufficient evidence regarding the role of respirators in the prevention of SARS-CoV-2 infection. We analysed the impact of filtering facepiece class 2 (FFP2) versus surgical masks on the risk of SARS-CoV-2 acquisition among Swiss ... ...

    Abstract Background: There is insufficient evidence regarding the role of respirators in the prevention of SARS-CoV-2 infection. We analysed the impact of filtering facepiece class 2 (FFP2) versus surgical masks on the risk of SARS-CoV-2 acquisition among Swiss healthcare workers (HCW).
    Methods: Our prospective multicentre cohort enrolled HCW from June to August 2020. Participants were asked about COVID-19 risk exposures/behaviours, including preferentially worn mask type when caring for COVID-19 patients outside of aerosol-generating procedures. The impact of FFP2 on (1) self-reported SARS-CoV-2-positive nasopharyngeal PCR/rapid antigen tests captured during weekly surveys, and (2) SARS-CoV-2 seroconversion between baseline and January/February 2021 was assessed.
    Results: We enrolled 3259 participants from nine healthcare institutions, whereof 716 (22%) preferentially used FFP2. Among these, 81/716 (11%) reported a SARS-CoV-2-positive swab, compared to 352/2543 (14%) surgical mask users; seroconversion was documented in 85/656 (13%) FFP2 and 426/2255 (19%) surgical mask users. Adjusted for baseline characteristics, COVID-19 exposure, and risk behaviour, FFP2 use was non-significantly associated with decreased risk for SARS-CoV-2-positive swab (adjusted hazard ratio [aHR] 0.8, 95% CI 0.6-1.0) and seroconversion (adjusted odds ratio [aOR] 0.7, 95% CI 0.5-1.0); household exposure was the strongest risk factor (aHR 10.1, 95% CI 7.5-13.5; aOR 5.0, 95% CI 3.9-6.5). In subgroup analysis, FFP2 use was clearly protective among those with frequent (> 20 patients) COVID-19 exposure (aHR 0.7 for positive swab, 95% CI 0.5-0.8; aOR 0.6 for seroconversion, 95% CI 0.4-1.0).
    Conclusions: Respirators compared to surgical masks may convey additional protection from SARS-CoV-2 for HCW with frequent exposure to COVID-19 patients.
    MeSH term(s) Adolescent ; Adult ; Aerosols ; Aged ; COVID-19/epidemiology ; COVID-19/prevention & control ; Female ; Health Personnel ; Humans ; Infection Control/methods ; Kaplan-Meier Estimate ; Logistic Models ; Male ; Masks ; Middle Aged ; Prospective Studies ; Respiratory Protective Devices ; Seroconversion ; Switzerland ; Young Adult
    Chemical Substances Aerosols
    Language English
    Publishing date 2022-02-05
    Publishing country England
    Document type Journal Article ; Multicenter Study ; Observational Study ; Research Support, Non-U.S. Gov't
    ZDB-ID 2666706-X
    ISSN 2047-2994 ; 2047-2994
    ISSN (online) 2047-2994
    ISSN 2047-2994
    DOI 10.1186/s13756-022-01070-6
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Risk and symptoms of COVID-19 in health professionals according to baseline immune status and booster vaccination during the Delta and Omicron waves in Switzerland-A multicentre cohort study.

    Babouee Flury, Baharak / Güsewell, Sabine / Egger, Thomas / Leal, Onicio / Brucher, Angela / Lemmenmeier, Eva / Meier Kleeb, Dorette / Möller, J Carsten / Rieder, Philip / Rütti, Markus / Schmid, Hans-Ruedi / Stocker, Reto / Vuichard-Gysin, Danielle / Wiggli, Benedikt / Besold, Ulrike / McGeer, Allison / Risch, Lorenz / Friedl, Andrée / Schlegel, Matthias /
    Kuster, Stefan P / Kahlert, Christian R / Kohler, Philipp

    PLoS medicine

    2022  Volume 19, Issue 11, Page(s) e1004125

    Abstract: Background: Knowledge about protection conferred by previous Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) infection and/or vaccination against emerging viral variants allows clinicians, epidemiologists, and health authorities to predict ... ...

    Abstract Background: Knowledge about protection conferred by previous Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) infection and/or vaccination against emerging viral variants allows clinicians, epidemiologists, and health authorities to predict and reduce the future Coronavirus Disease 2019 (COVID-19) burden. We investigated the risk and symptoms of SARS-CoV-2 (re)infection and vaccine breakthrough infection during the Delta and Omicron waves, depending on baseline immune status and subsequent vaccinations.
    Methods and findings: In this prospective, multicentre cohort performed between August 2020 and March 2022, we recruited hospital employees from ten acute/nonacute healthcare networks in Eastern/Northern Switzerland. We determined immune status in September 2021 based on serology and previous SARS-CoV-2 infections/vaccinations: Group N (no immunity); Group V (twice vaccinated, uninfected); Group I (infected, unvaccinated); Group H (hybrid: infected and ≥1 vaccination). Date and symptoms of (re)infections and subsequent (booster) vaccinations were recorded until March 2022. We compared the time to positive SARS-CoV-2 swab and number of symptoms according to immune status, viral variant (i.e., Delta-dominant before December 27, 2021; Omicron-dominant on/after this date), and subsequent vaccinations, adjusting for exposure/behavior variables. Among 2,595 participants (median follow-up 171 days), we observed 764 (29%) (re)infections, thereof 591 during the Omicron period. Compared to group N, the hazard ratio (HR) for (re)infection was 0.33 (95% confidence interval [CI] 0.22 to 0.50, p < 0.001) for V, 0.25 (95% CI 0.11 to 0.57, p = 0.001) for I, and 0.04 (95% CI 0.02 to 0.10, p < 0.001) for H in the Delta period. HRs substantially increased during the Omicron period for all groups; in multivariable analyses, only belonging to group H was associated with protection (adjusted HR [aHR] 0.52, 95% CI 0.35 to 0.77, p = 0.001); booster vaccination was associated with reduction of breakthrough infection risk in groups V (aHR 0.68, 95% CI 0.54 to 0.85, p = 0.001) and H (aHR 0.67, 95% CI 0.45 to 1.00, p = 0.048), largely observed in the early Omicron period. Group H (versus N, risk ratio (RR) 0.80, 95% CI 0.66 to 0.97, p = 0.021) and participants with booster vaccination (versus nonboosted, RR 0.79, 95% CI 0.71 to 0.88, p < 0.001) reported less symptoms during infection. Important limitations are that SARS-CoV-2 swab results were self-reported and that results on viral variants were inferred from the predominating strain circulating in the community at that time, rather than sequencing.
    Conclusions: Our data suggest that hybrid immunity and booster vaccination are associated with a reduced risk and reduced symptom number of SARS-CoV-2 infection during Delta- and Omicron-dominant periods. For previously noninfected individuals, booster vaccination might reduce the risk of symptomatic Omicron infection, although this benefit seems to wane over time.
    MeSH term(s) Humans ; COVID-19/epidemiology ; COVID-19/prevention & control ; Viral Vaccines ; Prospective Studies ; Switzerland/epidemiology ; SARS-CoV-2 ; Vaccination/methods
    Chemical Substances Viral Vaccines
    Language English
    Publishing date 2022-11-07
    Publishing country United States
    Document type Multicenter Study ; Journal Article
    ZDB-ID 2185925-5
    ISSN 1549-1676 ; 1549-1277
    ISSN (online) 1549-1676
    ISSN 1549-1277
    DOI 10.1371/journal.pmed.1004125
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  6. Article ; Online: Association of viral variant and vaccination status with the occurrence of symptoms compatible with post-acute sequelae after primary SARS-CoV-2 infection

    Kahlert, Christian R. / Strahm, Carol B / Guesewell, Sabine / Cusini, Alexia / Brucher, Angela / Goppel, Stephan / Moeller, Carsten / Ortner, Manuela / Ruetti, Markus / Stocker, Reto / Vuichard-Gysin, Danielle / Besold, Ulrike / McGeer, Allison / Risch, Lorenz / Friedl, Andree / Schlegel, Matthias / Vernazza, Pietro / Kuster, Stefan / Kohler, Philipp

    medRxiv

    Abstract: Importance: Disentangling the effects of different SARS-CoV-2 variants and of vaccination on the occurrence of post-acute sequelae of SARS-CoV-2 (PASC) is crucial to estimate and potentially reduce the future burden of PASC. Objective: To determine the ... ...

    Abstract Importance: Disentangling the effects of different SARS-CoV-2 variants and of vaccination on the occurrence of post-acute sequelae of SARS-CoV-2 (PASC) is crucial to estimate and potentially reduce the future burden of PASC. Objective: To determine the association of primary SARS-CoV-2 infection on the frequency of PASC symptoms by viral variant and vaccination status. Design: Cross-sectional questionnaire and SARS-CoV-2 serology (May/June 2022) performed within a prospective healthcare worker cohort (SURPRISE study). Setting: Multicenter study in nine healthcare networks from North-Eastern Switzerland. Participants: Volunteer sample of healthcare workers (HCW) from participating institutions. Of approximately 20000 eligible participants, 3870 registered for the cohort and 2912 were included in this analysis. Exposures: SARS-CoV-2 infection documented by positive nasopharyngeal swab (>4 weeks ago), stratified by viral variant and vaccination status at time of infection, compared to absence of documented infection (no positive swab, negative serology). Main Outcome: Sum score of eighteen self-reported PASC symptoms. Results: Among 2912 participants (median age 44 years, 81.3% female), SARS-CoV-2 infection was reported by 1685 (55.9%) participants, thereof 315 (18.7%) during Wild-type, 288 (17.1%) during Alpha/Delta, and 1082 (64.2%) during Omicron circulation. Mean symptom number in previously infected participants significantly exceeded that of uninfected controls (0.39), but decreased with recency of the viral variant: 1.12 (p<0.001) for Wild-type (median time since infection 18.5 months), 0.67 (p<0.001) for Alpha/Delta (6.6 months), and 0.52 (p=0.005) for Omicron BA.1 (3.1 months) infected participants. After Omicron BA.1 infection, the mean symptom score was 0.49 (p=0.30) for those with at least 3 prior vaccinations and 0.71 (p=0.028) with 1-2 previous vaccinations compared to 0.36 for unvaccinated individuals. Adjusting for confounders, Wild-type (adjusted risk ratio [aRR] 2.81, 95% confidence interval [CI] 2.08-3.83) and Alpha/Delta infection (aRR 1.93, 95% CI 1.10-3.46) showed significant associations with the outcome, whereas Omicron BA.1 infection (aRR 1.29, 95% CI 0.69-2.43) and vaccination before infection (aRR 1.27, 95% CI 0.82-1.94) did not. Conclusions and Relevance: Previous infection with pre-Omicron variants was the strongest risk factor for reporting PASC symptoms in this HCW cohort. A definite influence of prior vaccination on the prevention of PASC after Omicron BA.1 infection was not measurable.
    Keywords covid19
    Language English
    Publishing date 2022-10-22
    Publisher Cold Spring Harbor Laboratory Press
    Document type Article ; Online
    DOI 10.1101/2022.10.21.22281349
    Database COVID19

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  7. Article ; Online: Impact of baseline SARS-CoV-2 antibody status on syndromic surveillance and the risk of subsequent COVID-19-a prospective multicenter cohort study.

    Kohler, Philipp / Güsewell, Sabine / Seneghini, Marco / Egger, Thomas / Leal, Onicio / Brucher, Angela / Lemmenmeier, Eva / Möller, J Carsten / Rieder, Philip / Ruetti, Markus / Stocker, Reto / Vuichard-Gysin, Danielle / Wiggli, Benedikt / Besold, Ulrike / Kuster, Stefan P / McGeer, Allison / Risch, Lorenz / Friedl, Andrée / Schlegel, Matthias /
    Vernazza, Pietro / Kahlert, Christian R

    BMC medicine

    2021  Volume 19, Issue 1, Page(s) 270

    Abstract: Background: In a prospective healthcare worker (HCW) cohort, we assessed the risk of SARS-CoV-2 infection according to baseline serostatus.: Methods: Baseline serologies were performed among HCW from 23 Swiss healthcare institutions between June and ... ...

    Abstract Background: In a prospective healthcare worker (HCW) cohort, we assessed the risk of SARS-CoV-2 infection according to baseline serostatus.
    Methods: Baseline serologies were performed among HCW from 23 Swiss healthcare institutions between June and September 2020, before the second COVID-19 wave. Participants answered weekly electronic questionnaires covering information about nasopharyngeal swabs (PCR/rapid antigen tests) and symptoms compatible with coronavirus disease 2019 (COVID-19). Screening of symptomatic staff by nasopharyngeal swabs was routinely performed in participating facilities. We compared numbers of positive nasopharyngeal tests and occurrence of COVID-19 symptoms between HCW with and without anti-nucleocapsid antibodies.
    Results: A total of 4812 HCW participated, wherein 144 (3%) were seropositive at baseline. We analyzed 107,807 questionnaires with a median follow-up of 7.9 months. Median number of answered questionnaires was similar (24 vs. 23 per person, P = 0.83) between those with and without positive baseline serology. Among 2712 HCW with ≥ 1 SARS-CoV-2 test during follow-up, 3/67 (4.5%) seropositive individuals reported a positive result (one of whom asymptomatic), compared to 547/2645 (20.7%) seronegative participants, 12 of whom asymptomatic (risk ratio [RR] 0.22; 95% confidence interval [CI] 0.07 to 0.66). Seropositive HCWs less frequently reported impaired olfaction/taste (6/144, 4.2% vs. 588/4674, 12.6%, RR 0.33, 95% CI 0.15-0.73), chills (19/144, 13.2% vs. 1040/4674, 22.3%, RR 0.59, 95% CI 0.39-0.90), and limb/muscle pain (28/144, 19.4% vs. 1335/4674, 28.6%, RR 0.68 95% CI 0.49-0.95). Impaired olfaction/taste and limb/muscle pain also discriminated best between positive and negative SARS-CoV-2 results.
    Conclusions: Having SARS-CoV-2 anti-nucleocapsid antibodies provides almost 80% protection against SARS-CoV-2 re-infection for a period of at least 8 months.
    MeSH term(s) COVID-19 ; Cohort Studies ; Health Personnel ; Humans ; Prospective Studies ; SARS-CoV-2 ; Sentinel Surveillance
    Language English
    Publishing date 2021-10-14
    Publishing country England
    Document type Journal Article ; Multicenter Study ; Research Support, Non-U.S. Gov't
    ISSN 1741-7015
    ISSN (online) 1741-7015
    DOI 10.1186/s12916-021-02144-9
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  8. Article ; Online: Non-occupational and occupational factors associated with specific SARS-CoV-2 antibodies among hospital workers - A multicentre cross-sectional study.

    Kahlert, Christian R / Persi, Raphael / Güsewell, Sabine / Egger, Thomas / Leal-Neto, Onicio B / Sumer, Johannes / Flury, Domenica / Brucher, Angela / Lemmenmeier, Eva / Möller, J Carsten / Rieder, Philip / Stocker, Reto / Vuichard-Gysin, Danielle / Wiggli, Benedikt / Albrich, Werner C / Babouee Flury, Baharak / Besold, Ulrike / Fehr, Jan / Kuster, Stefan P /
    McGeer, Allison / Risch, Lorenz / Schlegel, Matthias / Friedl, Andrée / Vernazza, Pietro / Kohler, Philipp

    Clinical microbiology and infection : the official publication of the European Society of Clinical Microbiology and Infectious Diseases

    2021  Volume 27, Issue 9, Page(s) 1336–1344

    Abstract: Objectives: Protecting healthcare workers (HCWs) from coronavirus disease-19 (COVID-19) is critical to preserve the functioning of healthcare systems. We therefore assessed seroprevalence and identified risk factors for severe acute respiratory syndrome- ...

    Abstract Objectives: Protecting healthcare workers (HCWs) from coronavirus disease-19 (COVID-19) is critical to preserve the functioning of healthcare systems. We therefore assessed seroprevalence and identified risk factors for severe acute respiratory syndrome-coronavirus-2 (SARS-CoV-2) seropositivity in this population.
    Methods: Between 22 June 22 and 15 August 2020, HCWs from institutions in northern/eastern Switzerland were screened for SARS-CoV-2 antibodies. We recorded baseline characteristics, non-occupational and occupational risk factors. We used pairwise tests of associations and multivariable logistic regression to identify factors associated with seropositivity.
    Results: Among 4664 HCWs from 23 healthcare facilities, 139 (3%) were seropositive. Non-occupational exposures independently associated with seropositivity were contact with a COVID-19-positive household (adjusted OR 59, 95% CI 33-106), stay in a COVID-19 hotspot (aOR 2.3, 95% CI 1.2-4.2) and male sex (aOR 1.9, 95% CI 1.1-3.1). Blood group 0 vs. non-0 (aOR 0.5, 95% CI 0.3-0.8), active smoking (aOR 0.4, 95% CI 0.2-0.7), living with children <12 years (aOR 0.3, 95% CI 0.2-0.6) and being a physician (aOR 0.2, 95% CI 0.1-0.5) were associated with decreased risk. Other occupational risk factors were close contact to COVID-19 patients (aOR 2.7, 95% CI 1.4-5.4), exposure to COVID-19-positive co-workers (aOR 1.9, 95% CI 1.1-2.9), poor knowledge of standard hygiene precautions (aOR 1.9, 95% CI 1.2-2.9) and frequent visits to the hospital canteen (aOR 2.3, 95% CI 1.4-3.8).
    Discussion: Living with COVID-19-positive households showed the strongest association with SARS-CoV-2 seropositivity. We identified several potentially modifiable work-related risk factors, which might allow mitigation of the COVID-19 risk among HCWs. The lower risk among those living with children, even after correction for multiple confounders, is remarkable and merits further study.
    MeSH term(s) Adolescent ; Adult ; Aged ; Antibodies, Viral/metabolism ; COVID-19/epidemiology ; COVID-19/immunology ; Cross-Sectional Studies ; Female ; Health Personnel ; Humans ; Male ; Middle Aged ; Multivariate Analysis ; Occupational Diseases/epidemiology ; Occupational Diseases/immunology ; Occupational Diseases/virology ; Risk Factors ; SARS-CoV-2/immunology ; Seroepidemiologic Studies ; Sex Characteristics ; Socioeconomic Factors ; Switzerland/epidemiology ; Young Adult
    Chemical Substances Antibodies, Viral
    Language English
    Publishing date 2021-05-19
    Publishing country England
    Document type Journal Article ; Multicenter Study
    ZDB-ID 1328418-6
    ISSN 1469-0691 ; 1470-9465 ; 1198-743X
    ISSN (online) 1469-0691
    ISSN 1470-9465 ; 1198-743X
    DOI 10.1016/j.cmi.2021.05.014
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  9. Article ; Online: Symptoms Compatible With Long Coronavirus Disease (COVID) in Healthcare Workers With and Without Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) Infection-Results of a Prospective Multicenter Cohort.

    Strahm, Carol / Seneghini, Marco / Güsewell, Sabine / Egger, Thomas / Leal-Neto, Onicio / Brucher, Angela / Lemmenmeier, Eva / Meier Kleeb, Dorette / Möller, J Carsten / Rieder, Philip / Ruetti, Markus / Rutz, Remus / Schmid, Hans Ruedi / Stocker, Reto / Vuichard-Gysin, Danielle / Wiggli, Benedikt / Besold, Ulrike / Kuster, Stefan P / McGeer, Allison /
    Risch, Lorenz / Friedl, Andrée / Schlegel, Matthias / Schmid, Dagmar / Vernazza, Pietro / Kahlert, Christian R / Kohler, Philipp

    Clinical infectious diseases : an official publication of the Infectious Diseases Society of America

    2022  Volume 75, Issue 1, Page(s) e1011–e1019

    Abstract: Background: The burden of long-term symptoms (ie, long COVID) in patients after mild COVID-19 is debated. Within a cohort of healthcare workers (HCWs), frequency and risk factors for symptoms compatible with long COVID are assessed.: Methods: ... ...

    Abstract Background: The burden of long-term symptoms (ie, long COVID) in patients after mild COVID-19 is debated. Within a cohort of healthcare workers (HCWs), frequency and risk factors for symptoms compatible with long COVID are assessed.
    Methods: Participants answered baseline (August/September 2020) and weekly questionnaires on SARS-CoV-2 nasopharyngeal swab (NPS) results and acute disease symptoms. In January 2021, SARS-CoV-2 serology was performed; in March, symptoms compatible with long COVID (including psychometric scores) were asked and compared between HCWs with positive NPS, seropositive HCWs without positive NPS (presumable asymptomatic/pauci-symptomatic infections), and negative controls. The effect of time since diagnosis and quantitative anti-spike protein antibodies (anti-S) was evaluated. Poisson regression was used to identify risk factors for symptom occurrence.
    Results: Of 3334 HCWs (median, 41 years; 80% female), 556 (17%) had a positive NPS and 228 (7%) were only seropositive. HCWs with positive NPS more frequently reported ≥1 symptom compared with controls (73% vs 52%, P < .001); seropositive HCWs without positive NPS did not score higher than controls (58% vs 52%, P = .13), although impaired taste/olfaction (16% vs 6%, P < .001) and hair loss (17% vs 10%, P = .004) were more common. Exhaustion/burnout was reported by 24% of negative controls. Many symptoms remained elevated in those diagnosed >6 months ago; anti-S titers correlated with high symptom scores. Acute viral symptoms in weekly questionnaires best predicted long-COVID symptoms. Physical activity at baseline was negatively associated with neurocognitive impairment and fatigue scores.
    Conclusions: Seropositive HCWs without positive NPS are only mildly affected by long COVID. Exhaustion/burnout is common, even in noninfected HCWs. Physical activity might be protective against neurocognitive impairment/fatigue symptoms after COVID-19.
    MeSH term(s) Asymptomatic Infections/epidemiology ; COVID-19/complications ; COVID-19/epidemiology ; Fatigue ; Female ; Health Personnel ; Humans ; Male ; Olfaction Disorders ; Prospective Studies ; SARS-CoV-2
    Language English
    Publishing date 2022-01-28
    Publishing country United States
    Document type Journal Article ; Multicenter Study
    ZDB-ID 1099781-7
    ISSN 1537-6591 ; 1058-4838
    ISSN (online) 1537-6591
    ISSN 1058-4838
    DOI 10.1093/cid/ciac054
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article: Polypharmazie: Weniger ist oft mehr

    Rychter, Olav / Besold, Ulrike / Kistler, Bernhard / Hürny, Christoph / Münzer, Thomas

    Hausarzt-Praxis

    2011  Volume 6, Issue 6/7, Page(s) 39

    Language German
    Document type Article
    ZDB-ID 2229849-6
    ISSN 1661-6197
    Database Current Contents Medicine

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