Surveillance data analysis on measles, Anambra State, Nigeria, 2011-2016
Obagha Chijioke1,&, Simeon Ajisegiri1, Belinda Uba1, Saheed Gidado1, Patrick Nguku1
1Nigeria Field Epidemiology and Laboratory Training Program, Abuja, Nigeria
Obagha Chijioke, Nigeria Field Epidemiology and Laboratory Training Programme, Abuja, Nigeria
measles is the leading cause of vaccine preventable deaths among children. Globally there were 134,200 measles death in 2015. Vaccination resulted in a 79% drop in measles deaths between 2000 and 2015 (WHO 2015). In Nigeria, there were 11,856 confirmed; 104 deaths (CFR, 0.41%), 9-59 months were most affected. 62.1% zero dose (NCDC week 52 epidemiological report 2016). Measles is targeted for elimination and under case based surveillance with laboratory confirmation. We described the surveillance data and assessed the surveillance performance according to measles surveillance indicators.
we conducted a descriptive retrospective review of measles surveillance data from 2011-2016. Data were extracted from integrated disease surveillance and response forms. Incidence was calculated using number of cases/ projected population. We calculated frequencies and proportions.
a total of 2576 suspected case was reported during the period of which 13.4% (357) were Laboratory confirmed and 2% (52) confirmed by Epi linkage, 7 deaths (CFR 1.7%). Under 5 age group were the most affected (range: 36.4% - 86.9%). Peak year was 2013 with Incidence of 5/100,000 population. 241(60%) of confirmed cases had zero vaccine dosage, 136(34%) had one dose, 15(3.8%) had 2 doses or more and 8(2%) had unknown vaccination status. In 2016, the surveillance system did not meet the set target (> = 80%) for these indicators; specimen arriving laboratory (lab) within 3 days of collection (9%), lab results reported within 7 days of specimen receipt (39%), cases with adequate investigation initiated within 3 days of onset of rash (42.5%). This was also the case in 2014 and 2016.
the state is in line with the elimination target of < 5 cases/ 100,000 pop. There is still significant number of unvaccinated children and measles surveillance performance is not adequate.
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