O. Faye et al., MALARIA AND RICE GROWING IN THE SENEGAL R IVER DELTA (SENEGAL), Annales de la Societe belge de medecine tropicale, 75(3), 1995, pp. 179-189
An epidemiological survey of malaria was carried out from September 19
92 to November 1994 in three villages located in the Senegal river del
ta, two villages growing rice in irrigated fields and one practicing t
raditional rain water agriculture. Entomological observations showed t
hat Anopheles pharoensis is the main anopheline species caught in the
area with a high population density in the rice growing villages. The
population density of species of the An. gambiae complex, represented
by An. gambiae s.s., An. arabiensis and An. melas is low. Agressivity
rates and anthropophlic indexes of An. pharoensis females are high but
their parity rates are low. The malaria transmission is weak and was
not perceptible in the area as shown by the negative results obtained
with the ELISA tests and the examination of salivary glands. Parasitol
ogical indexes, malaria morbidity and incidence rates are low and are
in agreement with the entomological data. In the Senegal river delta,
irrigation has, on the whole, increased the An. pharoensis density but
both malaria transmission and incidence rates did not rise.