Abstract
In Vietnam, the average number of fleas per rat (flea index) decreases exponentially when the monthly rainfall exceeds 10 cm and the flea index increases exponentially when the rainfall is less than 10 cm per month. Plague in rats and in man is inversely proportional to rainfall. Relative humidity (RH) may limit plague in man when monthly averages for RH and temperature are less than 66 per cent and greater than 26.5°C, respectively.
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