Figure 6 Time series and decomposition of monthly Japanese encephalitis virus IgG seroprevalence in all pigs sampled in eastern Uttar Pradesh, India, February 2013 – December 2022.
Annual peaks of IgG seroprevalence were highest in Sant Kabir Nagar and Gorakhpur (60.8% in 2016 and 57.0% in 2015, respectively; Figure S14). A pattern of annual IgG seroprevalence by district was not apparent (Figure S14) and was further investigated using the rolling mean of the quarterly seroprevalence (IgG) of JEV in pigs across 10 districts of eastern Uttar Pradesh under the study period (Figure 7). Periods of low then slowly increasing seroprevalence occurred across all districts except Deoria in the second half of the study period from 2019—2022. In the first half of the study period from 2014—2018, the rolling quarterly IgG seroprevalence was overall higher, and this appeared to be predominantly in districts prone to flooding (Kushinagar, Siddarthnagar, Gorakhpur, Basti and Sant Kabir Nagar).