Fig. 3.

Monthly variation of Campylobacter positivity rates in poultry batches from each of the five provinces under study and overall, at each month of the study period. Sri Lanka, October 2009– July 2011. Error bars of the marker symbols indicate 95% confidence intervals of the monthly Campylobacter positivity rates in poultry batches. A locally weighted scatterplot smoothing (LOWESS) curve (solid back line) with corresponding 95% confidence intervals (dotted back line) is fitted to the observed data. The South-West monsoon usually lasts from May to September.