2.2. ASF outbreak investigations and sample collection

Between 2016 and 2018, 37 ASF outbreaks were reported in domestic pigs in 8 states of Nigeria (Figure 1). One hundred ten outbreak samples were collected consisting of whole blood (47) and tissue (63) (liver, spleen and lymph nodes) from 147 pig farms. Samples were collected from intensive/cluster pig farms, and free‐roaming pigs in the affected states of the country. Although, 147 pig farms reported suspected ASF cases, samples were collected in selected farms if they were clusters of pig farms. The affected states were Abia, Benue, Enugu, Kaduna, Imo, Lagos, Plateau and Taraba states (Figure 1, Table 1).

Map of Nigeria showing the distribution of African swine fever virus genotype I variants recovered from outbreaks between 2016 and 2018

Distribution of African swine fever outbreaks, samples collected, laboratory results in eight states of Nigeria from 2016 to 2018