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  1. Article ; Online: Comparing the tradeoffs of measles vaccine delivery strategies.

    Carcelen, Andrea C / Winter, Amy K

    The Lancet. Global health

    2023  Volume 11, Issue 8, Page(s) e1140–e1141

    MeSH term(s) Humans ; Infant ; Measles Vaccine ; Measles/epidemiology ; Measles/prevention & control ; Vaccination
    Chemical Substances Measles Vaccine
    Language English
    Publishing date 2023-07-19
    Publishing country England
    Document type Journal Article ; Comment
    ZDB-ID 2723488-5
    ISSN 2214-109X ; 2214-109X
    ISSN (online) 2214-109X
    ISSN 2214-109X
    DOI 10.1016/S2214-109X(23)00260-7
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  2. Article ; Online: Rubella.

    Winter, Amy K / Moss, William J

    Lancet (London, England)

    2022  Volume 399, Issue 10332, Page(s) 1336–1346

    Abstract: Rubella is an acute illness caused by rubella virus and characterised by fever and rash. Although rubella is a clinically mild illness, primary rubella virus infection in early pregnancy can result in congenital rubella syndrome, which has serious ... ...

    Abstract Rubella is an acute illness caused by rubella virus and characterised by fever and rash. Although rubella is a clinically mild illness, primary rubella virus infection in early pregnancy can result in congenital rubella syndrome, which has serious medical and public health consequences. WHO estimates that approximately 100 000 congenital rubella syndrome cases occur per year. Rubella virus is transmitted through respiratory droplets and direct contact. 25-50% of people infected with rubella virus are asymptomatic. Clinical disease often results in mild, self-limited illness characterised by fever, a generalised erythematous maculopapular rash, and lymphadenopathy. Complications include arthralgia, arthritis, thrombocytopenic purpura, and encephalitis. Common presenting signs and symptoms of congenital rubella syndrome include cataracts, sensorineural hearing impairment, congenital heart disease, jaundice, purpura, hepatosplenomegaly, and microcephaly. Rubella and congenital rubella syndrome can be prevented by rubella-containing vaccines, which are commonly administered in combination with measles vaccine. Although global rubella vaccine coverage reached only 70% in 2020 global rubella eradiation remains an ambitious but achievable goal.
    MeSH term(s) Female ; Humans ; Measles Vaccine ; Pregnancy ; Rubella/diagnosis ; Rubella/epidemiology ; Rubella/prevention & control ; Rubella Syndrome, Congenital/diagnosis ; Rubella Syndrome, Congenital/epidemiology ; Rubella Syndrome, Congenital/prevention & control ; Rubella Vaccine ; Rubella virus
    Chemical Substances Measles Vaccine ; Rubella Vaccine
    Language English
    Publishing date 2022-04-03
    Publishing country England
    Document type Journal Article ; Review
    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(21)02691-X
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  3. Article ; Online: The important role of serology for COVID-19 control.

    Winter, Amy K / Hegde, Sonia T

    The Lancet. Infectious diseases

    2020  Volume 20, Issue 7, Page(s) 758–759

    MeSH term(s) Betacoronavirus ; COVID-19 ; Coronavirus Infections ; Humans ; Pandemics ; Pneumonia, Viral ; SARS-CoV-2
    Keywords covid19
    Language English
    Publishing date 2020-04-21
    Publishing country United States
    Document type Journal Article ; Comment
    ZDB-ID 2061641-7
    ISSN 1474-4457 ; 1473-3099
    ISSN (online) 1474-4457
    ISSN 1473-3099
    DOI 10.1016/S1473-3099(20)30322-4
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  5. Article ; Online: The important role of serology for COVID-19 control

    Winter, Amy K / Hegde, Sonia T

    The Lancet Infectious Diseases

    2020  Volume 20, Issue 7, Page(s) 758–759

    Keywords Infectious Diseases ; covid19
    Language English
    Publisher Elsevier BV
    Publishing country us
    Document type Article ; Online
    ZDB-ID 2061641-7
    ISSN 1474-4457 ; 1473-3099
    ISSN (online) 1474-4457
    ISSN 1473-3099
    DOI 10.1016/s1473-3099(20)30322-4
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    In stock of ZB MED Cologne/Königswinter

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  6. Article ; Online: Who is missed in a community-based survey: Assessment and implications of biases due to incomplete sampling frame in a community-based serosurvey, Choma and Ndola Districts, Zambia, 2022.

    Kostandova, Natalya / Mutembo, Simon / Prosperi, Christine / Mwansa, Francis Dien / Nakazwe, Chola / Namukoko, Harriet / Nachinga, Bertha / Chongwe, Gershom / Chilumba, Innocent / Matakala, Kalumbu H / Musukwa, Gloria / Hamahuwa, Mutinta / Mufwambi, Webster / Matoba, Japhet / Situtu, Kenny / Mutale, Irene / Kong, Alex C / Simulundu, Edgar / Ndubani, Phillimon /
    Hasan, Alvira Z / Truelove, Shaun A / Winter, Amy K / Carcelen, Andrea C / Lau, Bryan / Moss, William J / Wesolowski, Amy

    PLOS global public health

    2024  Volume 4, Issue 4, Page(s) e0003072

    Abstract: Community-based serological studies are increasingly relied upon to measure disease burden, identify population immunity gaps, and guide control and elimination strategies; however, there is little understanding of the potential for and impact of ... ...

    Abstract Community-based serological studies are increasingly relied upon to measure disease burden, identify population immunity gaps, and guide control and elimination strategies; however, there is little understanding of the potential for and impact of sampling biases on outcomes of interest. As part of efforts to quantify measles immunity gaps in Zambia, a community-based serological survey using stratified multi-stage cluster sampling approach was conducted in Ndola and Choma districts in May-June 2022, enrolling 1245 individuals. We carried out a follow-up study among individuals missed from the sampling frame of the serosurvey in July-August 2022, enrolling 672 individuals. We assessed the potential for and impact of biases in the community-based serosurvey by i) estimating differences in characteristics of households and individuals included and excluded (77% vs 23% of households) from the sampling frame of the serosurvey and ii) evaluating the magnitude these differences make on healthcare-seeking behavior, vaccination coverage, and measles seroprevalence. We found that missed households were 20% smaller and 25% less likely to have children. Missed individuals resided in less wealthy households, had different distributions of sex and occupation, and were more likely to seek care at health facilities. Despite these differences, simulating a survey in which missed households were included in the sampling frame resulted in less than a 5% estimated bias in these outcomes. Although community-based studies are upheld as the gold standard study design in assessing immunity gaps and underlying community health characteristics, these findings underscore the fact that sampling biases can impact the results of even well-conducted community-based surveys. Results from these studies should be interpreted in the context of the study methodology and challenges faced during implementation, which include shortcomings in establishing accurate and up-to-date sampling frames. Failure to account for these shortcomings may result in biased estimates and detrimental effects on decision-making.
    Language English
    Publishing date 2024-04-29
    Publishing country United States
    Document type Journal Article
    ISSN 2767-3375
    ISSN (online) 2767-3375
    DOI 10.1371/journal.pgph.0003072
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  7. Article: Rubella Vaccine Introduction in the South African Public Vaccination Schedule: Mathematical Modelling for Decision Making.

    Motaze, Nkengafac Villyen / Edoka, Ijeoma / Wiysonge, Charles S / Metcalf, C Jessica E / Winter, Amy K

    Vaccines

    2020  Volume 8, Issue 3

    Abstract: ... ...

    Abstract Background
    Language English
    Publishing date 2020-07-13
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2703319-3
    ISSN 2076-393X
    ISSN 2076-393X
    DOI 10.3390/vaccines8030383
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  8. Article ; Online: Publisher Correction: Long-term measles antibody profiles following different vaccine schedules in China, a longitudinal study.

    Wang, Qianli / Wang, Wei / Winter, Amy K / Zhan, Zhifei / Ajelli, Marco / Trentini, Filippo / Wang, Lili / Li, Fangcai / Yang, Juan / Xiang, Xingyu / Liao, Qiaohong / Zhou, Jiaxin / Guo, Jinxin / Yan, Xuemei / Liu, Nuolan / Metcalf, C Jessica E / Grenfell, Bryan T / Yu, Hongjie

    Nature communications

    2023  Volume 14, Issue 1, Page(s) 2458

    Language English
    Publishing date 2023-04-28
    Publishing country England
    Document type Published Erratum
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-023-38167-4
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  9. Article ; Online: An evaluation of the early impact of the COVID-19 pandemic on Zambia's routine immunization program.

    Winter, Amy K / Takahashi, Saki / Carcelen, Andrea C / Hayford, Kyla / Mutale, Wilbroad / Mwansa, Francis D / Sinyange, Nyambe / Ngula, David / Moss, William J / Mutembo, Simon

    PLOS global public health

    2023  Volume 3, Issue 5, Page(s) e0000554

    Abstract: Implications of the COVID-19 pandemic for both populations and healthcare systems are vast. In addition to morbidity and mortality from COVID-19, the pandemic also disrupted local health systems, including reductions or delays in routine vaccination ... ...

    Abstract Implications of the COVID-19 pandemic for both populations and healthcare systems are vast. In addition to morbidity and mortality from COVID-19, the pandemic also disrupted local health systems, including reductions or delays in routine vaccination services and catch-up vaccination campaigns. These disruptions could lead to outbreaks of other infectious diseases that result in an additional burden of disease and strain on the healthcare system. We evaluated the impact of the COVID-19 pandemic on Zambia's routine childhood immunization program in 2020 using multiple sources of data. We relied on administrative vaccination data and Zambia's 2018 Demographic and Health Survey to project national disruptions to district-specific routine childhood vaccination coverage within the pandemic year 2020. Next, we leveraged a 2016 population-based serological survey to predict age-specific measles seroprevalence and assessed the impact of changes in vaccination coverage on measles outbreak risk in each district. We found minor disruptions to routine administration of measles-rubella and pentavalent vaccines in 2020. This was in part due to Zambia's Child Health Week held in June of 2020 which helped to reach children missed during the first six months of the year. We estimated that the two-month delay in a measles-rubella vaccination campaign, originally planned for September of 2020 but conducted in November of 2020 as a result of the pandemic, had little impact on modeled district-specific measles outbreak risks. This study estimated minimal increases in the number of children missed by vaccination services in Zambia during 2020. However, the ongoing SARS-CoV-2 transmission since our analysis concluded means efforts to maintain routine immunization services and minimize the risk of measles outbreaks will continue to be critical. The methodological framework developed in this analysis relied on routinely collected data to estimate disruptions of the COVID-19 pandemic to national routine vaccination program performance and its impact on children missed at the subnational level can be deployed in other countries or for other vaccines.
    Language English
    Publishing date 2023-05-02
    Publishing country United States
    Document type Journal Article
    ISSN 2767-3375
    ISSN (online) 2767-3375
    DOI 10.1371/journal.pgph.0000554
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  10. Article ; Online: Long-term measles antibody profiles following different vaccine schedules in China, a longitudinal study.

    Wang, Qianli / Wang, Wei / Winter, Amy K / Zhan, Zhifei / Ajelli, Marco / Trentini, Filippo / Wang, Lili / Li, Fangcai / Yang, Juan / Xiang, Xingyu / Liao, Qiaohong / Zhou, Jiaxin / Guo, Jinxin / Yan, Xuemei / Liu, Nuolan / Metcalf, C Jessica E / Grenfell, Bryan T / Yu, Hongjie

    Nature communications

    2023  Volume 14, Issue 1, Page(s) 1746

    Abstract: Characterizing the long-term kinetics of maternally derived and vaccine-induced measles immunity is critical for informing measles immunization strategies moving forward. Based on two prospective cohorts of children in China, we estimate that maternally ... ...

    Abstract Characterizing the long-term kinetics of maternally derived and vaccine-induced measles immunity is critical for informing measles immunization strategies moving forward. Based on two prospective cohorts of children in China, we estimate that maternally derived immunity against measles persists for 2.4 months. Following two-dose series of measles-containing vaccine (MCV) at 8 and 18 months of age, the immune protection against measles is not lifelong, and antibody concentrations are extrapolated to fall below the protective threshold of 200 mIU/ml at 14.3 years. A catch-up MCV dose in addition to the routine doses between 8 months and 5 years reduce the cumulative incidence of seroreversion by 79.3-88.7% by the age of 6 years. Our findings also support a good immune response after the first MCV vaccination at 8 months. These findings, coupled with the effectiveness of a catch-up dose in addition to the routine doses, could be instrumental to relevant stakeholders when planning routine immunization schedules and supplemental immunization activities.
    MeSH term(s) Child ; Humans ; Infant ; Adolescent ; Longitudinal Studies ; Prospective Studies ; Measles/epidemiology ; Measles/prevention & control ; Measles Vaccine ; Vaccination ; Antibodies, Viral ; China/epidemiology
    Chemical Substances Measles Vaccine ; Antibodies, Viral
    Language English
    Publishing date 2023-03-29
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-023-37407-x
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