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  1. Article ; Online: COVID-19 self-testing using antigen rapid diagnostic tests: Feasibility evaluation among health-care workers and general population in Malawi.

    Mukoka, Madalo / Sibanda, Euphemia / Watadzaushe, Constancia / Kumwenda, Moses / Abok, Florence / Corbett, Elizabeth L / Ivanova, Elena / Choko, Augustine Talumba

    PloS one

    2023  Volume 18, Issue 7, Page(s) e0289291

    Abstract: Background: COVID-19 testing is critical for identifying cases to prevent transmission. COVID-19 self-testing has the potential to increase diagnostic testing capacity and to expand access to hard-to-reach areas in low-and-middle-income countries. We ... ...

    Abstract Background: COVID-19 testing is critical for identifying cases to prevent transmission. COVID-19 self-testing has the potential to increase diagnostic testing capacity and to expand access to hard-to-reach areas in low-and-middle-income countries. We investigated the feasibility and acceptability of COVID-19 self-sampling and self-testing using SARS-CoV-2 Antigen-Rapid Diagnostic Tests (Ag-RDTs).
    Methods: From July 2021 to February 2022, we conducted a mixed-methods cross-sectional study examining self-sampling and self-testing using Standard Q and Panbio COVID-19 Ag Rapid Test Device in Urban and rural Blantyre, Malawi. Health care workers and adults (18y+) in the general population were non-randomly sampled.
    Results: Overall, 1,330 participants were enrolled of whom 674 (56.0%) were female and 656 (54.0%) were male with 664 for self-sampling and 666 for self-testing. Mean age was 30.7y (standard deviation [SD] 9.6). Self-sampling usability threshold for Standard Q was 273/333 (82.0%: 95% CI 77.4% to 86.0%) and 261/331 (78.8%: 95% CI 74.1% to 83.1%) for Panbio. Self-testing threshold was 276/335 (82.4%: 95% CI 77.9% to 86.3%) and 300/332 (90.4%: 95% CI 86.7% to 93.3%) for Standard Q and Panbio, respectively. Agreement between self-sample results and professional test results was 325/325 (100%) and 322/322 (100%) for Standard Q and Panbio, respectively. For self-testing, agreement was 332/333 (99.7%: 95% CI 98.3 to 100%) for Standard Q and 330/330 (100%: 95% CI 99.8 to 100%) for Panbio. Odds of achieving self-sampling threshold increased if the participant was recruited from an urban site (odds ratio [OR] 2.15 95% CI 1.44 to 3.23, P < .01. Compared to participants with primary school education those with secondary and tertiary achieved higher self-testing threshold OR 1.88 (95% CI 1.17 to 3.01), P = .01 and 4.05 (95% CI 1.20 to13.63), P = .02, respectively.
    Conclusions: One of the first studies to demonstrate high feasibility and acceptability of self-testing using SARS-CoV-2 Ag-RDTs among general and health-care worker populations in low- and middle-income countries potentially supporting large scale-up. Further research is warranted to provide optimal delivery strategies of self-testing.
    MeSH term(s) Adult ; Humans ; Female ; Male ; COVID-19 Testing ; Malawi/epidemiology ; COVID-19/diagnosis ; COVID-19/epidemiology ; Cross-Sectional Studies ; Feasibility Studies ; Self-Testing ; SARS-CoV-2 ; Sensitivity and Specificity
    Language English
    Publishing date 2023-07-28
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2267670-3
    ISSN 1932-6203 ; 1932-6203
    ISSN (online) 1932-6203
    ISSN 1932-6203
    DOI 10.1371/journal.pone.0289291
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  2. Article ; Online: Accuracy of and preferences for blood-based versus oral-fluid-based HIV self-testing in Malawi: a cross-sectional study.

    O'Reilly, Ailva / Mavhu, Webster / Neuman, Melissa / Kumwenda, Moses K / Johnson, Cheryl C / Sinjani, George / Indravudh, Pitchaya / Choko, Augustin / Hatzold, Karin / Corbett, Elizabeth L

    BMC infectious diseases

    2024  Volume 22, Issue Suppl 1, Page(s) 979

    Abstract: Background: HIV self-testing (HIVST) can use either oral-fluid or blood-based tests. Studies have shown strong preferences for self-testing compared to facility-based services. Despite availability of low-cost blood-based HIVST options, to date, HIVST ... ...

    Abstract Background: HIV self-testing (HIVST) can use either oral-fluid or blood-based tests. Studies have shown strong preferences for self-testing compared to facility-based services. Despite availability of low-cost blood-based HIVST options, to date, HIVST implementation in sub-Saharan Africa has largely been oral-fluid-based. We investigated whether users preferred blood-based (i.e. using blood sample derived from a finger prick) or oral fluid-based HIVST in rural and urban Malawi.
    Methods: At clinics providing HIV testing services (n = 2 urban; n = 2 rural), participants completed a semi-structured questionnaire capturing sociodemographic data before choosing to test using oral-fluid-based HVST, blood-based HIVST or provider-delivered testing. They also completed a self-administered questionnaire afterwards, followed by a confirmatory test using the national algorithm then appropriate referral. We used simple and multivariable logistic regression to identify factors associated with preference for oral-fluid or blood-based HIVST.
    Results: July to October 2018, N = 691 participants enrolled in this study. Given the choice, 98.4% (680/691) selected HIVST over provider-delivered testing. Of 680 opting for HIVST, 416 (61.2%) chose oral-fluid-based HIVST, 264 (38.8%) chose blood-based HIVST and 99.1% (674/680) reported their results appropriately. Self-testers who opted for blood-based HIVST were more likely to be male (50.3% men vs. 29.6% women, p < 0.001), attending an urban facility (43% urban vs. 34.6% rural, p = 0.025) and regular salary-earners (49.5% regular vs. 36.8% non-regular, p = 0.012). After adjustment, only sex was found to be associated with choice of self-test (adjusted OR 0.43 (95%CI: 0.3-0.61); p-value < 0.001). Among 264 reporting blood-based HIVST results, 11 (4.2%) were HIV-positive. Blood-based HIVST had sensitivity of 100% (95% CI: 71.5-100%) and specificity of 99.6% (95% CI: 97.6-100%), with 20 (7.6%) invalid results. Among 416 reporting oral-fluid-based HIVST results 18 (4.3%) were HIV-positive. Oral-fluid-based HIVST had sensitivity of 88.9% (95% CI: 65.3-98.6%) and specificity of 98.7% (95% CI: 97.1-99.6%), with no invalid results.
    Conclusions: Offering both blood-based and oral-fluid-based HIVST resulted in high uptake when compared directly with provider-delivered testing. Both types of self-testing achieved high accuracy among users provided with a pre-test demonstration beforehand. Policymakers and donors need to adequately plan and budget for the sensitisation and support needed to optimise the introduction of new quality-assured blood-based HIVST products.
    MeSH term(s) Humans ; Male ; Female ; Self-Testing ; HIV ; Cross-Sectional Studies ; Malawi ; Self Care ; HIV Infections/diagnosis ; HIV Testing ; Surveys and Questionnaires ; Mass Screening/methods
    Language English
    Publishing date 2024-04-02
    Publishing country England
    Document type Journal Article
    ZDB-ID 2041550-3
    ISSN 1471-2334 ; 1471-2334
    ISSN (online) 1471-2334
    ISSN 1471-2334
    DOI 10.1186/s12879-024-09231-1
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Experience of social harms among female sex workers following HIV self-test distribution in Malawi: results of a cohort study.

    Mee, Paul / Neuman, Melissa / Kumwenda, Moses / Lora, Wezzie S / Sikwese, Simon / Sambo, Mwiza / Fielding, Katherine / Indravudh, Pitchaya P / Hatzold, Karin / Johnson, Cheryl / Corbett, Elizabeth L / Desmond, Nicola

    BMC infectious diseases

    2024  Volume 22, Issue Suppl 1, Page(s) 978

    Abstract: Background: In Malawi, female sex workers (FSW) have high HIV incidence and regular testing is suggested. HIV self-testing (HIVST) is a safe and acceptable alternative to standard testing services. This study assessed; whether social harms were more ... ...

    Abstract Background: In Malawi, female sex workers (FSW) have high HIV incidence and regular testing is suggested. HIV self-testing (HIVST) is a safe and acceptable alternative to standard testing services. This study assessed; whether social harms were more likely to be reported after HIVST distribution to FSW by peer distributors than after facility-based HIV testing and whether FSW regretted HIVST use or experienced associated relationship problems.
    Methods: Peer HIVST distributors, who were FSW, were recruited in Blantyre district, Malawi between February and July 2017. Among HIVST recipients a prospective cohort was recruited. Interviews were conducted at baseline and at end-line, 3 months later. Participants completed daily sexual activity diaries. End-line data were analysed using logistic regression to assess whether regret or relationship problems were associated with HIVST use. Sexual activity data were analysed using Generalised Estimating Equations to assess whether HIVST use was temporally associated with an increase in social harms.
    Results: Of 265 FSW recruited and offered HIVST, 131 completed both interviews. Of these, 31/131(23.7%) reported initial regret after HIVST use, this reduced to 23/131(17.6%) at the 3-month follow-up. Relationship problems were reported by 12/131(9.2%). Regret about HIVST use was less commonly reported in those aged 26-35 years compared to those aged 16-25 years (OR immediate regret-0.40 95% CI 0.16-1.01) (OR current regret-0.22 95% CI 0.07 - 0.71) and was not associated with the HIVST result. There was limited evidence that reports of verbal abuse perpetrated by clients in the week following HIVST use were greater than when there was no testing in the preceding week. There was no evidence for increases in any other social harms. There was some evidence of coercion to test, most commonly initiated by the peer distributor.
    Conclusions: Little evidence was found that the peer distribution model was associated with increased levels of social harms, however programmes aimed at reaching FSW need to carefully consider possible unintended consequences of their service delivery approaches, including the potential for peer distributors to coerce individuals to test or disclose their test results and alternative distribution models may need to be considered.
    MeSH term(s) Humans ; Female ; Sex Workers ; Cohort Studies ; Prospective Studies ; Self-Testing ; Malawi/epidemiology ; Mass Screening/methods ; HIV Infections/diagnosis ; HIV Infections/epidemiology ; HIV Testing
    Language English
    Publishing date 2024-03-11
    Publishing country England
    Document type Journal Article
    ZDB-ID 2041550-3
    ISSN 1471-2334 ; 1471-2334
    ISSN (online) 1471-2334
    ISSN 1471-2334
    DOI 10.1186/s12879-024-09178-3
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  4. Article ; Online: HIV self-testing to scale up couples and partner testing.

    Johnson, Cheryl C / Corbett, Elizabeth L

    The lancet. HIV

    2016  Volume 3, Issue 6, Page(s) e243–4

    MeSH term(s) Family Characteristics ; HIV Infections ; HIV Seropositivity ; Humans ; Mass Screening ; Serologic Tests ; Sexual Partners
    Language English
    Publishing date 2016-04-08
    Publishing country Netherlands
    Document type Journal Article ; Comment
    ISSN 2352-3018
    ISSN (online) 2352-3018
    DOI 10.1016/S2352-3018(16)00044-8
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  5. Article ; Online: Non-Tuberculous Mycobacterial Pulmonary Disease identified during community-based screening for

    Twabi, Hussein H / Mukoka-Thindwa, Madalo / Shani, Doris / Nliwasa, Marriott / Corbett, Elizabeth L

    Malawi medical journal : the journal of Medical Association of Malawi

    2021  Volume 33, Issue 1, Page(s) 65–67

    Abstract: There is a rising prevalence of Non-Tuberculous Mycobacterial (NTM) disease in sub-Saharan Africa identified on culture specimens. However, distinguishing mycobacterial colonisations from infection from identified NTMs on culture in the sub-Saharan ... ...

    Abstract There is a rising prevalence of Non-Tuberculous Mycobacterial (NTM) disease in sub-Saharan Africa identified on culture specimens. However, distinguishing mycobacterial colonisations from infection from identified NTMs on culture in the sub-Saharan Africa setting remains to be established. A 49-year-old man presented with the cardinal symptoms of tuberculosis (TB) in a community TB prevalence survey in Blantyre, Malawi. Mycobacteriology was atypical, prompting a line probe assay which revealed Mycobacterium avium complex (MAC) species. The epidemiology of
    MeSH term(s) Antiretroviral Therapy, Highly Active ; Antitubercular Agents/therapeutic use ; HIV Infections/complications ; HIV Infections/diagnosis ; HIV Infections/drug therapy ; Humans ; Male ; Middle Aged ; Mycobacterium Infections, Nontuberculous/drug therapy ; Nontuberculous Mycobacteria/isolation & purification ; Treatment Outcome
    Chemical Substances Antitubercular Agents
    Language English
    Publishing date 2021-08-23
    Publishing country Malawi
    Document type Case Reports
    ZDB-ID 2491952-4
    ISSN 1995-7270 ; 1995-7270
    ISSN (online) 1995-7270
    ISSN 1995-7270
    DOI 10.4314/mmj.v33i1.10
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  6. Article ; Online: Population benefits of addressing programmatic and social determinants of gender disparities in tuberculosis in Viet Nam: A modelling study.

    Horton, Katherine C / White, Richard G / Hoa, Nguyen Binh / Nguyen, Hai Viet / Bakker, Roel / Sumner, Tom / Corbett, Elizabeth L / Houben, Rein M G J

    PLOS global public health

    2022  Volume 2, Issue 7, Page(s) e0000784

    Abstract: High prevalence of infectious tuberculosis among men suggests potential population-wide benefits from addressing programmatic and social determinants of gender disparities. Utilising a sex-stratified compartmental transmission model calibrated to ... ...

    Abstract High prevalence of infectious tuberculosis among men suggests potential population-wide benefits from addressing programmatic and social determinants of gender disparities. Utilising a sex-stratified compartmental transmission model calibrated to tuberculosis burden estimates for Viet Nam, we modelled interventions to increase active case finding, to reduce tobacco smoking, and to reduce alcohol consumption by 2025 in line with national and global targets. For each intervention, we examined scenarios differentially targeting men and women and evaluated impact on tuberculosis morbidity and mortality in men, women, and children in 2035. Active case finding interventions targeting men projected greater reductions in tuberculosis incidence in men, women, and children (16.2%, uncertainty interval, UI, 11.4-23.0%, 11.8%, UI 8.0-18.6%, and 21.5%, UI 16.9-28.5%, respectively) than those targeting women (5.2%, UI 3.8-7.1%, 5.4%, UI 3.9-7.3%, and 8.6%, UI 6.9-10.7%, respectively). Projected reductions in tuberculosis incidence for interventions to reduce male tobacco smoking and alcohol consumption were greatest for men (17.4%, UI 11.8-24.7%, and 11.0%, UI 5.4-19.4%, respectively), but still substantial for women (6.9%, UI 3.8-12.5%, and 4.4%, UI 1.9-10.6%, respectively) and children (12.7%, UI 8.4-19.0%, and 8.0%, UI 3.9-15.0%, respectively). Comparable interventions targeting women projected limited impact, with declines of 0.3% (UI 0.2%-0.3%) and 0.1% (UI 0.0%-0.1%), respectively. Addressing programmatic and social determinants of men's tuberculosis burden has population-wide benefits. Future interventions to increase active case finding, to reduce tobacco smoking, and to reduce harmful alcohol consumption, whilst not ignoring women, should focus on men to most effectively reduce tuberculosis morbidity and mortality in men, women, and children.
    Language English
    Publishing date 2022-07-14
    Publishing country United States
    Document type Journal Article
    ISSN 2767-3375
    ISSN (online) 2767-3375
    DOI 10.1371/journal.pgph.0000784
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  7. Article ; Online: Lessons learned from implementation of four HIV self-testing (HIVST) distribution models in Zambia: applying the Consolidated Framework for Implementation Research to understand impact of contextual factors on implementation.

    Simwinga, Musonda / Gwanu, Lwiindi / Hensen, Bernadette / Sigande, Lucheka / Mainga, Mwami / Phiri, Thokozile / Mwanza, Eliphas / Kabumbu, Mutale / Mulubwa, Chama / Mwenge, Lawrence / Bwalya, Chiti / Kumwenda, Moses / Mubanga, Ellen / Mee, Paul / Johnson, Cheryl C / Corbett, Elizabeth L / Hatzold, Karin / Neuman, Melissa / Ayles, Helen /
    Taegtmeyer, Miriam

    BMC infectious diseases

    2024  Volume 22, Issue Suppl 1, Page(s) 977

    Abstract: Background: Although Zambia has integrated HIV-self-testing (HIVST) into its Human Immunodeficiency Virus (HIV) regulatory frameworks, few best practices to optimize the use of HIV self-testing to increase testing coverage have been documented. We ... ...

    Abstract Background: Although Zambia has integrated HIV-self-testing (HIVST) into its Human Immunodeficiency Virus (HIV) regulatory frameworks, few best practices to optimize the use of HIV self-testing to increase testing coverage have been documented. We conducted a prospective case study to understand contextual factors guiding implementation of four HIVST distribution models to inform scale-up in Zambia.
    Methods: We used the qualitative case study method to explore user and provider experiences with four HIVST distribution models (two secondary distribution models in Antenatal Care (ANC) and Antiretroviral Therapy (ART) clinics, community-led, and workplace) to understand factors influencing HIVST distribution. Participants were purposefully selected based on their participation in HIVST and on their ability to provide rich contextual experience of the distribution models. Data were collected using observations (n = 31), group discussions (n = 10), and in-depth interviews (n = 77). Data were analyzed using the thematic approach and aligned to the four Consolidated Framework for Implementation Research (CFIR) domains.
    Results: Implementation of the four distribution models was influenced by an interplay of outer and inner setting factors. Inadequate compensation and incentives for distributors may have contributed to distributor attrition in the community-led and workplace HIVST models. Stockouts, experienced at the start of implementation in the secondary-distribution and community-led distribution models often disrupted distribution. The existence of policy and practices aided integration of HIVST in the workplace. External factors complimented internal factors for successful implementation. For instance, despite distributor attrition leading to excessive workload, distributors often multi-tasked to keep up with demand for kits, even though distribution points were geographically widespread in the workplace, and to a less extent in the community-led models. Use of existing communication platforms such as lunchtime and safety meetings to promote and distribute kits, peers to support distributors, reduction in trips by distributors to replenish stocks, increase in monetary incentives and reorganisation of stakeholder roles proved to be good adaptations.
    Conclusion: HIVST distribution was influenced by a combination of contextual factors in variable ways. Understanding how the factors interacted in real world settings informed adaptations to implementation devised to minimize disruptions to distribution.
    MeSH term(s) Pregnancy ; Female ; Humans ; HIV ; Zambia ; Self-Testing ; HIV Infections/diagnosis ; HIV Infections/drug therapy ; HIV Testing
    Language English
    Publishing date 2024-03-06
    Publishing country England
    Document type Journal Article
    ZDB-ID 2041550-3
    ISSN 1471-2334 ; 1471-2334
    ISSN (online) 1471-2334
    ISSN 1471-2334
    DOI 10.1186/s12879-024-09168-5
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  8. Article ; Online: Patient-incurred cost of inpatient treatment for Tuberculosis in rural Malawi.

    Shin, Hyejeong / Ngwira, Lucky G / Tucker, Austin / Chaisson, Richard E / Corbett, Elizabeth L / Dowdy, David W

    Tropical medicine & international health : TM & IH

    2020  Volume 25, Issue 5, Page(s) 624–634

    Abstract: Objectives: To mitigate the economic burden of tuberculosis (TB), it is important to fully understand the costs of TB treatment from the patient perspective. We therefore sought to quantify the patient-incurred cost of TB treatment in rural Malawi, with ...

    Abstract Objectives: To mitigate the economic burden of tuberculosis (TB), it is important to fully understand the costs of TB treatment from the patient perspective. We therefore sought to quantify the patient-incurred cost of TB treatment in rural Malawi, with specific focus on costs borne by patients requiring inpatient hospitalisation.
    Methods: We conducted a cross-sectional survey of 197 inpatients and 156 outpatients being treated for TB in rural Malawi. We collected data on out-of-pocket costs and lost wages, including costs to guardians. Costs for inpatient TB treatment were estimated and compared to costs for outpatient TB treatment. We then explored the equity distribution of inpatient TB treatment cost using concentration curves.
    Results: Despite free government services, inpatients were estimated to incur a mean of $137 (standard deviation: $147) per initial TB episode, corresponding to >50% of annual household spending among patients in the lowest expenditure quintile. Non-medical hospitalisation costs accounted for 88% of this total. Patients treated entirely as outpatients incurred estimated costs of $25 (standard deviation: $15) per episode. The concentration curves showed that, among individuals hospitalised for an initial TB episode, poorer patients shouldered a much greater proportion of inpatient TB treatment costs than wealthier ones (concentration index: -0.279).
    Conclusion: Patients hospitalised for TB in resource-limited rural Malawi experience devastating costs of TB treatment. Earlier diagnosis and treatment must be prioritised if we are to meet goals of effective TB control, avoidance of catastrophic costs and provision of appropriate patient-centred care in such settings.
    MeSH term(s) Adult ; Cross-Sectional Studies ; Female ; Health Expenditures/statistics & numerical data ; Hospitalization/statistics & numerical data ; Humans ; Malawi/epidemiology ; Male ; Rural Population ; Tuberculosis, Pulmonary/economics ; Tuberculosis, Pulmonary/epidemiology ; Tuberculosis, Pulmonary/therapy
    Language English
    Publishing date 2020-02-28
    Publishing country England
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 1314080-2
    ISSN 1365-3156 ; 1360-2276
    ISSN (online) 1365-3156
    ISSN 1360-2276
    DOI 10.1111/tmi.13381
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  9. Article ; Online: Systematic Review and Meta-Analysis of Sex Differences in Social Contact Patterns and Implications for Tuberculosis Transmission and Control.

    Horton, Katherine C / Hoey, Anne L / Béraud, Guillaume / Corbett, Elizabeth L / White, Richard G

    Emerging infectious diseases

    2020  Volume 26, Issue 5, Page(s) 910–919

    Abstract: Social contact patterns might contribute to excess burden of tuberculosis in men. We conducted a study of social contact surveys to evaluate contact patterns relevant to tuberculosis transmission. Available data describe 21 surveys in 17 countries and ... ...

    Abstract Social contact patterns might contribute to excess burden of tuberculosis in men. We conducted a study of social contact surveys to evaluate contact patterns relevant to tuberculosis transmission. Available data describe 21 surveys in 17 countries and show profound differences in sex-based and age-based patterns of contact. Adults reported more adult contacts than children. Children preferentially mixed with women in all surveys (median sex assortativity 58%, interquartile range [IQR] 57%-59% for boys, 61% [IQR 60%-63%] for girls). Men and women reported sex-assortative mixing in 80% and 95% of surveys (median sex assortativity 56% [IQR 54%-58%] for men, 59% [IQR 57%-63%] for women). Sex-specific patterns of contact with adults were similar at home and outside the home for children; adults reported greater sex assortativity outside the home in most surveys. Sex assortativity in adult contacts likely contributes to sex disparities in adult tuberculosis burden by amplifying incidence among men.
    MeSH term(s) Adult ; Child ; Female ; Humans ; Incidence ; Male ; Sex Characteristics ; Surveys and Questionnaires ; Tuberculosis/epidemiology
    Language English
    Publishing date 2020-04-20
    Publishing country United States
    Document type Journal Article ; Meta-Analysis ; Research Support, Non-U.S. Gov't ; Systematic Review
    ZDB-ID 1380686-5
    ISSN 1080-6059 ; 1080-6040
    ISSN (online) 1080-6059
    ISSN 1080-6040
    DOI 10.3201/eid2605.190574
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  10. Article ; Online: Africa faces difficult choices in responding to COVID-19.

    Divala, Titus / Burke, Rachael M / Ndeketa, Latif / Corbett, Elizabeth L / MacPherson, Peter

    Lancet (London, England)

    2020  Volume 395, Issue 10237, Page(s) 1611

    MeSH term(s) Africa/epidemiology ; Betacoronavirus ; COVID-19 ; Communicable Disease Control/methods ; Communicable Disease Control/organization & administration ; Coronavirus Infections/mortality ; Coronavirus Infections/prevention & control ; Health Services Accessibility ; Humans ; Pandemics/prevention & control ; Pneumonia, Viral/mortality ; Pneumonia, Viral/prevention & control ; Risk Assessment ; SARS-CoV-2
    Keywords covid19
    Language English
    Publishing date 2020-05-12
    Publishing country England
    Document type Letter
    ZDB-ID 3306-6
    ISSN 1474-547X ; 0023-7507 ; 0140-6736
    ISSN (online) 1474-547X
    ISSN 0023-7507 ; 0140-6736
    DOI 10.1016/S0140-6736(20)31056-4
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