Abstract
Comparative analysis of vector activity of fleas in the Siberian natural plague foci was carried out during two long-term periods of experimental studies: 1967–1980 and 1983–2007. The data on block formation frequency in adult fleas infected with Yersinia pestis were analyzed for 127 experiments with 15 flea species and subspecies. The vector activity of fleas in all the Siberian plague foci (Altai, Tuva, and Transbaikalia) has increased over a rather short time period of 30–40 years. The frequencies of flea blocking were significantly different (P < 0.001) between the analyzed periods in all the three plague foci.
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