Figure 3 Annual seroprevalence of IgM for Japanese encephalitis virus in pigs in eastern Uttar Pradesh by district, October 2017 – December 2022. Bars indicate 95% confidence intervals.
Red line = loess smoothed seroprevalence.
No significant linear trend was observed in the time series of monthly IgM seroprevalence (overall change in seroprevalence = -2.1%/month [95% CI -4.5—0.4], P = 0.10). Time series decomposition revealed a marked seasonal pattern consisting of four annual peaks with the highest peak in August – September (monsoon season). However, the greatest variation in seroprevalence was due to the remainder (random) portion of the decomposed time series (range -22.3—43.7% adjustment to trend line).