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Prevalence of Widal antibodies in apparently healthy human population.

Five hundred and ten serum samples of apparently healthy individuals were tested for Widal agglutinins. On screening with slide agglutination method, 113(22.16%) out of 510 sera showed positive Widal reaction. The test was positive in relatively greater number of males than females. The highest percentage (30.52) was seen in younger age group (1-20 years). Socio-economic status also had an effection the Widal agglutinins, the highest percentage being in lower socioeconomic group. On comparing the source of water supply, it was seen that people using Municipality water exhibited higher percentage of positive widal reaction than other sources like hand pumps and local reservoirs. Furthermore, all the 113 positive sera were titrated by tube agglutination method. The mean agglutinating titre of "O", H and Vi being 1:16.96±1.46, 1:35.43±3 26 and 1:12±0.54 respectively. The present study revealed that the carrier state was greater than vaccination state (JPMA 30:269, 1980).