Implementation research: reactive mass vaccination with single-dose oral cholera vaccine, Zambia.

OBJECTIVE: To describe the implementation and feasibility of an innovative mass vaccination strategy - based on single-dose oral cholera vaccine - to curb a cholera epidemic in a large urban setting. METHOD: In April 2016, in the early stages of a cholera outbreak in Lusaka, Zambia, the health ministry collaborated with Médecins Sans Frontières and the World Health Organization in organizing a mass vaccination campaign, based on single-dose oral cholera vaccine. Over a period of 17 days, partners mobilized 1700 health ministry staff and community volunteers for community sensitization, social mobilization and vaccination activities in 10 townships. On each day, doses of vaccine were delivered to vaccination sites and administrative coverage was estimated. FINDINGS: Overall, vaccination teams administered 424 100 doses of vaccine to an estimated target population of 578 043, resulting in an estimated administrative coverage of 73.4%. After the campaign, few cholera cases were reported and there was no evidence of the disease spreading within the vaccinated areas. The total cost of the campaign - 2.31 United States dollars (US$) per dose - included the relatively low cost of local delivery - US$ 0.41 per dose. CONCLUSION: We found that an early and large-scale targeted reactive campaign using a single-dose oral vaccine, organized in response to a cholera epidemic within a large city, to be feasible and appeared effective. While cholera vaccines remain in short supply, the maximization of the number of vaccines in response to a cholera epidemic, by the use of just one dose per member of an at-risk community, should be considered.

The impact of an immunization programme administered through the Growth Monitoring Programme Plus as an alternative way of implementing Integrated Management of Childhood Illnesses in urban-slum areas of Lusaka, Zambia.

A time-lag study design was used to examine the effects of an immunization programme implemented through an integrated community-based child health approach called the Growth Monitoring Programme Plus (GMP+) in peri-urban areas of Lusaka, Zambia. The immunization coverage and sociodemographic data of eligible children and households were obtained from three repeated surveys in two intervention areas. Logistic regression analysis was performed to explore the factors affecting immunization coverage. For assessing the timeliness of immunization, a Computerised Immunization Coverage Calculation System (CICCS) was used. Full immunization coverage significantly increased in both the primary intervention (P<0.001) and lagged intervention (P = 0.011) areas after the initiation of the GMP+. Frequent attendance to GMP+ sessions played a significant role in the improvement of immunization coverage (P<0.001 for the final survey in the primary intervention area), whereas other sociodemographic characteristics of the child and caretaker were not associated with immunization coverage. Analysis of the timeliness of three doses of diphtheria, pertussis and tetanus DPT3 immunization by CICCS showed that coverage in the primary intervention area had significantly improved compared to the lagged intervention area. Our study indicated that immunization coverage was improved effectively with the intervention of the GMP+ as a model of an integrated immunization programme for child health in line with the Integrated Management of Childhood Illnesses (IMCI) and the Global Immunization Vision and Strategy (GIVS).

Improvement in mothers' immediate care-seeking behaviors for children's danger signs through a community-based intervention in Lusaka, Zambia.

The large number of child deaths in developing countries is associated with delays in care-seeking by families, but the community-based efforts of the Integrated Management of Childhood Illnesses developed by WHO/UNICEF has remained ineffectual. To improve caregivers' ability to recognise potentially life-threatening symptoms of major childhood illnesses, we provided education about the importance of danger signs and immediate care-seeking practices through a community-based intervention of 'the Growth Monitoring Programme Plus (GMP+)' in low-income areas of Lusaka, Zambia. Using repeated cross-sectional data from interviews, we compared attendance and non-attendance groups to assess the impacts of intervention on mothers' care-seeking. Of 1717 and 1546 attendance mothers in the baseline and the final survey, 1097 and 1035, respectively, sought care from a health centre after perceiving the danger signs. The proportion of mothers with immediate response increased from 35.7% (392/1097) to 51.5% (533/1035) (p < 0.01). In the final survey, the attendance mothers became more likely to respond immediately to the danger signs than the non-attendance mothers (adjusted odds ratio: 2.140, 95% confidence interval: [1.408-3.252]), and the higher educational level the attendance mothers had, the more likely they were to respond immediately to the danger signs (primary level: 2.067 [1.050-4.068], secondary level and above: 2.174 [1.098-4.306]). In conclusion, GMP+ with danger sign education can improve mothers' care-seeking for severely sick children. Therefore, GMP+ has the potential to reduce child death in developing countries, i.e., contribute to the Millennium Development Goal 4 aiming at reducing child mortality by two-thirds by 2015.