A study of mammal's flea distribution was conducted during the period 1962 - 2000. About 10,000 fleas were collected from 5,000 host animals of which 43 mammalian species belonging 7 orders distributed in 368 places in 50 provinces and cities over the country. Forty four from 83 or 51.8% (out of total 240 mammalian species found in Vietnam - 34.5%) collected mammals were found infected with flea. These mammals belong 7 orders of Insectivora, Scadenta, Chiroptera, Carnivora, Artiodactyla, Rodentia and Lagomorpha. The flea infection rate of Rodentia and Artiodactyla was 17.9% (27/34) and 31.3% (7/22), respectively. Only two of 79 species of Chiroptera found in Viet Nam were examined and both were found flea infected. However, flea was not found in the four mammalian species of Dermoptera, Primates, Perissodactyla and Pholidota
Fleas ; Epidemiology

An investigation was carried out on 244 rats (71,9% sewer rat; 27,7% black rats, 0,4% house mouse) with various index 30-40, which was increased and kept at high level from March to September. 268 fleas were collected (only 1 species of X.cheopis), the flea index oscillated from 0,11 to 1,90 and reached the highest level in April all isolations determined Y.pestis negatively. Flea resisted to malathion 5%, pyrethroid group was the greatest effectiveness
Plague ; Fleas

Since 1999, plague incidence tends to decrease and disease is localized in some linited areas in the High Plateaux region. The result of survey on flea and host showed that R.exulans was still predominant host. 100% of flea living on rat belong to X. cheopis species; Y.pestis was found in 3.54% of specimens from rats and in 1.47% of specimens from fleas. The findings suggested X.cheopis and important host (R.exulans) are the main factors of circulation of Y.pestis in the High Plateaux region
Plague ; Animals ; Fleas