Post Yellow Fever Campaign Coverage Survey 2019

First round

Nigeria as a signatory of the Global and Regional Public Health goals, has embarked on implementing the eliminate Yellow Fever Epidemics (EYE) Strategy that was launched in 2017. With more than 50 partners involved, the EYE partnership supports 40 at-risk countries in Africa and the Americas to prevent, detect, and respond to yellow fever suspected cases and outbreaks. The partnership aims at protecting at-risk populations, preventing international spread, and containing outbreaks rapidly. By 2026, it is expected that more than 1 billion people will be protected against the disease. The country has initiated a 10-year plan in line with the EYE strategic objectives. Reactive campaigns started in some States, namely Kogi, Kwara, Zamfara and Kebbi in 2018. This phase 1 States is followed by the end of November 2018, to cover the second preventive mass vaccination campaign in six high risk States (Borno, Plateau, FCT, Niger, Kebbi and Sokoto). For each phase, as approved by Gavi, a post campaign coverage survey is conducted to validate the performance.
The Post Yellow Fever Campaign Coverage Survey was conducted in January and February, 2019 in five of the six implementing states - Sokoto, Niger, Kebbi, Plateau and the FCT. The main objectives were to assess the level of yellow fever coverage in five (5) of the six (6) implementing states (FCT, Plateau, Kebbi, Sokoto and Niger) as well as to analyse coverage by age group (9-11 months, 12 - 23 months, 2 -5 years, 6-15 years and 16-44 years). The survey was also to determine reasons for non-vaccination of eligible population during the campaign and to determine the prevalence of children receiving the first dose of yellow fever vaccine during the campaign (i.e., previously unvaccinated) and finally to identify strengths and weaknesses of program management.
The study was a three-stage stratified sampling design involving the use of computer assisted personal interviewing (CAPI) administered on respondents for yellow fever vaccination status. Survey methodology was adopted from the 2018 WHO Guidelines for National Immunization Coverage Surveys. The sample size for the PYCCS 2019 was designed to estimate state level vaccination coverage in each of the five implementing states.
The survey was commissioned by the National Primary Healthcare Development Agency (NPHCDA) and implemented by the National Bureau of Statistics (NBS) with technical support from WHO and funded by Gavi. The entire duration of the survey was six months.
Information regarding whether individuals, aged 9 months to 44 years, had received yellow fever vaccination during the campaign was sought through use of card evidence and history. FCT, Abuja and Plateau states out of the five states achieved coverage of 96.1 percent and 93.6 percent which was more than the target 80 percent coverage during the campaign. The vaccination coverage in Niger, Kebbi and Sokoto states was 78.1 percent, 68.7 percent and 62.2 percent respectively.
Children between the ages 6-14 years had the highest (88.2 percent) proportion vaccinated during the campaign while children in the age groups of 9 to 23 months and 24 to 59 months, the youth aged 15 to 24 years and adults aged between 22 and 44 years reported 72.9 percent, 83.8 percent 74.5 percent and 72.9 percent respectively.