Last data update: Dec 09, 2024. (Total: 48320 publications since 2009)
Records 1-7 (of 7 Records) |
Query Trace: Wang SA[original query] |
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The efficacy and safety of rotavirus vaccines in countries in Africa and Asia with high child mortality
Henschke N , Bergman H , Hungerford D , Cunliffe NA , Grais RF , Kang G , Parashar UD , Wang SA , Neuzil KM . Vaccine 2022 40 (12) 1707-1711 Rotavirus remains a leading cause of diarrhoeal morbidity and mortality in young children and rotavirus vaccines are critical for reducing global disease burden. This report addresses the performance of rotavirus vaccines in countries with high child mortality. We performed a sensitivity analysis as part of a systematic review on rotavirus vaccines to inform development of World Health Organization vaccine recommendations. The efficacy of four prequalified vaccines against severe rotavirus gastroenteritis was similar across high mortality settings in Asia and Africa. Within the first year following vaccination, vaccine efficacy for the four vaccines ranged from 48% to 57% while in the second year, efficacy ranged from 29% to 54%. The four vaccines showed no increase in intussusception risk in these settings. All four vaccines appear to prevent significant numbers of severe rotavirus gastroenteritis episodes with no measurable increase in intussusception risk in high mortality settings in Africa and Asia. |
Human papillomavirus vaccination coverage among school girls in a demonstration project - Botswana, 2013
Raesima MM , Forhan SE , Voetsch AC , Hewitt S , Hariri S , Wang SA , Pelletier AR , Letebele M , Pheto T , Ramogola-Masire D , El-Halabi S . MMWR Morb Mortal Wkly Rep 2015 64 (40) 1147-9 What is already known on this topic? Human papillomavirus (HPV) infection is common and aggressive in persons infected with human immunodeficiency virus (HIV). With an HIV prevalence of 28% among females aged 15-49, cervical cancer is the leading cause of cancer death among women in Botswana. Before 2013, HPV vaccine had not been used in the public sector in Botswana.What is added by this report? Efforts to expand services for cervical cancer through the Pink Ribbon Red Ribbon initiative focused on HPV-related disease in Botswana. A demonstration project for HPV vaccination was developed by the Ministry of Health for school girls aged >/=9 years in primary schools in one community. A total of 1,967 (79%) of 2,488 eligible girls received 3 doses of vaccine in the immunization effort that was centered in schools.What are the implications for public health practice? Preventing HPV infection in girls is an important component of a national comprehensive cervical cancer control program. HPV vaccination programming is challenging, and demonstration projects can prepare countries for national introduction. The success of the initial HPV vaccination effort in Botswana led to an expanded project in 2014, with implementation of nationwide rollout of the HPV vaccine in 2015. It might be beneficial for future HPV vaccination campaigns to include strategies to reach out-of-school girls. |
Evidence for declining numbers of Ebola cases - Montserrado County, Liberia, June-October 2014
Nyenswah TG , Westercamp M , Kamali AA , Qin J , Zielinski-Gutierrez E , Amegashie F , Fallah M , Gergonne B , Nugba-Ballah R , Singh G , Aberle-Grasse JM , Havers F , Montgomery JM , Bawo L , Wang SA , Rosenberg R . MMWR Morb Mortal Wkly Rep 2014 63 (46) 1072-6 The epidemic of Ebola virus disease (Ebola) in West Africa that began in March 2014 has caused approximately 13,200 suspected, probable, and confirmed cases, including approximately 6,500 in Liberia. About 50% of Liberia's reported cases have been in Montserrado County (population 1.5 million), the most populous county, which contains the capital city, Monrovia. To examine the course of the Ebola epidemic in Montserrado County, data on Ebola treatment unit (ETU) admissions, laboratory testing of patient blood samples, and collection of dead bodies were analyzed. Each of the three data sources indicated consistent declines of 53%-73% following a peak incidence in mid-September. The declines in ETU admissions, percentage of patients with reverse transcription-polymerase chain reaction (RT-PCR) test results positive for Ebola, and dead bodies are the first evidence of reduction in disease after implementation of multiple prevention and response measures. The possible contributions of these interventions to the decline is not yet fully understood or corroborated. A reduction in cases suggests some progress; however, eliminating Ebola transmission is the critical goal and will require greatly intensified efforts for complete, high-quality surveillance to direct and drive the rapid intervention, tracking, and response efforts that remain essential. |
Preparing for human papillomavirus vaccine introduction in Kenya: implications from focus-group and interview discussions with caregivers and opinion leaders in western Kenya
Friedman AL , Oruko KO , Habel MA , Ford J , Kinsey J , Odhiambo F , Phillips-Howard PA , Wang SA , Collins T , Laserson KF , Dunne EF . BMC Public Health 2014 14 855 BACKGROUND: Cervical cancer claims the lives of 275,000 women each year; most of these deaths occur in low-or middle-income countries. In Kenya, cervical cancer is the leading cause of cancer-related mortality among women of reproductive age. Kenya's Ministry of Public Health and Sanitation has developed a comprehensive strategy to prevent cervical cancer, which includes plans for vaccinating preteen girls against human papillomavirus (HPV) by 2015. To identify HPV vaccine communication and mobilization needs, this research sought to understand HPV vaccine-related perceptions and concerns of male and female caregivers and community leaders in four rural communities of western Kenya. METHODS: We conducted five focus groups with caregivers (n = 56) and 12 key-informant interviews with opinion leaders to explore cervical cancer-related knowledge, attitudes and beliefs, as well as acceptability of HPV vaccination for 9-12 year-old girls. Four researchers independently reviewed the data and developed codes based on questions in interview guides and topics that emerged organically, before comparing and reconciling results through a group consensus process. RESULTS: Cervical cancer was not commonly recognized, though it was understood generally in terms of its symptoms. By association with cancer and genital/reproductive organs, cervical cancer was feared and stigmatized. Overall acceptability of a vaccine that prevents cervical cancer was high, so long as it was endorsed by trusted agencies and communities were sensitized first. Some concerns emerged related to vaccine safety (e.g., impact on fertility), program intent, and health equity. CONCLUSION: For successful vaccine introduction in Kenya, there is a need for communication and mobilization efforts to raise cervical cancer awareness; prompt demand for vaccination; address health equity concerns and stigma; and minimize potential resistance. Visible endorsement by government leaders and community influencers can provide reassurance of the vaccine's safety, efficacy and benefits for girls and communities. Involvement of community leadership, parents and champions may also be critical for combatting stigma and making cervical cancer relevant to Kenyan communities. These findings underscore the need for adequate planning and resources for information, education and communication prior to vaccine introduction. Specific recommendations for communication and social-marketing strategies are made. |
Factors associated with human immunodeficiency virus screening of women during pregnancy, labor and delivery, United States, 2005-2006
Fitz Harris LF , Taylor AW , Zhang F , Borkowf CB , Arthur BC , Jacques-Carroll L , Wang SA , Nesheim SR . Matern Child Health J 2014 18 (3) 648-56 The purpose of this study was to estimate prenatal human immunodeficiency virus (HIV) screening rates prior to and on admission to labor and delivery (L&D) and to examine factors associated with HIV screening, including hospital policies, with a comparison of HIV and hepatitis B prenatal screening practices and hospital policies. In March 2006, a survey of hospitals (n = 190) and review of paired maternal and infant medical records (n = 4,762) were conducted in 50 US states, DC, and Puerto Rico. Data from the survey and medical record review were analyzed using SAS software v9.2 (SAS Institute, Cary, NC). HIV testing before delivery occurred among 3,438 women (73.9 %); African American and Hispanic women were more likely to be tested than white women [aOR 2.22, 95 % CI (1.6-3.1) and aOR 1.55, 95 % CI (1.1-2.2), respectively]. Among women without previous HIV testing, 138 (16.6 %) were tested after admission to labor and delivery. Policies to test women with undocumented HIV status in at delivery were present in 65 (36.3 %) hospitals. HIV testing after admission to L&D was more likely in hospitals with policies to test women with undocumented HIV status [aOR 5.91, 95 % CI (2.0-17.8)]. Overall, policies and screening practices for HIV were consistently less prevalent than those for hepatitis B. Many women are not being routinely screened for HIV before or at delivery. Women with unknown HIV status were more likely to be tested in L&D in hospitals with testing policies. |
New vaccine introductions: assessing the impact and the opportunities for immunization and health systems strengthening
Wang SA , Hyde TB , Mounier-Jack S , Brenzel L , Favin M , Gordon WS , Shearer JC , Mantel CF , Arora N , Durrheim D . Vaccine 2013 31 Suppl 2 B122-8 In 2010, global immunization partners posed the question, "Do new vaccine introductions (NVIs) have positive or negative impacts on immunization and health systems of countries?" An Ad-hoc Working Group was formed for WHO's Strategic Advisory Group of Experts on immunization (SAGE) to examine this question through five approaches: a published literature review, a grey literature review, in-depth interviews with regional and country immunization staff, in-depth studies of recent NVIs in 3 countries, and a statistical analysis of the impact of NVI on DTP3 coverage in 176 countries. The WHO Health System Framework of building blocks was used to organize the analysis of these data to assess potential areas of impact of NVI on health systems. In April 2012, the Ad-hoc Working Group presented its findings to SAGE. While reductions in disease burden and improvements in disease and adverse events surveillance, training, cold chain and logistics capacity and injection safety were commonly documented as beneficial impacts, opportunities for strengthening the broader health system were consistently missed during NVI. Weaknesses in planning for human and financial resource needs were highlighted as a concern. Where positive impacts on health systems following NVI occurred, these were often in areas where detailed technical guidance or tools and adequate financing were available. SAGE supported the Ad-hoc Working Group's conclusion that future NVI should explicitly plan to optimize and document the impact of NVI on broader health systems. Furthermore, opportunities for improving integration of delivery of immunization services, commodities, and messages with other parts of the health system should be actively sought with the recognition that integration is a bidirectional process. To avoid the gaps in planning for NVI that can compromise existing immunization and health systems, donors and partners should provide sufficient and timely support to facilitate country planning. Areas for future research were also identified. Finally, to support countries in using NVI as an opportunity to strengthen immunization and health systems, the WHO guidance for countries on new vaccine introduction is being updated to reflect ways this might be accomplished. |
Human papillomavirus vaccine introduction - the first five years
Markowitz LE , Tsu V , Deeks SL , Cubie H , Wang SA , Vicari AS , Brotherton JM . Vaccine 2012 30 Suppl 5 F139-48 The availability of prophylactic human papillomavirus (HPV) vaccines has provided powerful tools for primary prevention of cervical cancer and other HPV-associated diseases. Since 2006, the quadrivalent and bivalent vaccines have each been licensed in over 100 countries. By the beginning of 2012, HPV vaccine had been introduced into national immunization programs in at least 40 countries. Australia, the United Kingdom, the United States, and Canada were among the first countries to introduce HPV vaccination. In Europe, the number of countries having introduced vaccine increased from 3 in 2007 to 22 at the beginning of 2012. While all country programs target young adolescent girls, specific target age groups vary as do catch-up recommendations. Different health care systems and infrastructure have resulted in varied implementation strategies, with some countries delivering vaccine in schools and others through health centers or primary care providers. Within the first 5 years after vaccines became available, few low- or middle-income countries had introduced HPV vaccine. The main reason was budgetary constraints due to the high vaccine cost. Bhutan and Rwanda implemented national immunization after receiving vaccine through donation programs in 2010 and 2011, respectively. The GAVI Alliance decision in 2011 to support HPV vaccination should increase implementation in low-income countries. Evaluation of vaccination programs includes monitoring of coverage, safety, and impact. Vaccine safety monitoring is part of routine activities in many countries. Safety evaluations are important and communication about vaccine safety is critical, as events temporally associated with vaccination can be falsely attributed to vaccination. Anti-vaccination efforts, in part related to concerns about safety, have been mounted in several countries. In the 5 years since HPV vaccines were licensed, there have been successes as well as challenges with vaccine introduction and implementation. Further progress is anticipated in the coming years, especially in low- and middle-income countries where the need for vaccine is greatest. This article forms part of a special supplement entitled "Comprehensive Control of HPV Infections and Related Diseases" Vaccine Volume 30, Supplement 5, 2012. |
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