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M Diallo

Publications and source records attributed to M Diallo.

44 records · Page 3Linked to original sources
PubMedDate not supplied

First evidence of natural vertical transmission of yellow fever virus in Aedes aegypti, its epidemic vector.

Entomological investigations were conducted in 1995 in Senegal, following a yellow fever (YF) outbreak. A total of 1125 mosquitoes collected in the field, including males, females and 12-48 h old newly emerged adults reared from wild-caught larvae, were tested for YF virus. Among the 22 species captured, Aedes aegypti was the most common. 'Wild' vectors of YF were also captured, including A. furcifer, A. metallicus and A. luteocephalus. In all, 28 YF virus isolations were made: 19 from A. aegypti females, including 2 from newly emerged specimens; 5 were obtained from A. aegypti males, including one from a pool of newly emerged specimens, 2 from A. furcifer females, and one each from a female A. metallicus and a female A. luteocephalus. The true infection rates (TIRs) were much higher in adult A. aegypti than in specimens reared from larvae--8.2% and 31.4% for female and male A. aegypti captured on human volunteers, respectively (P < 0.0001). The TIRs for A. aegypti reared from larvae were 1.4% and 0.5% for females and males, respectively (P > 0.05). This outbreak was an intermediate YF epidemic, involving 4 vector species. Our data provide the first evidence of vertical transmission of YF virus in nature by A. aegypti, its main vector to humans, and strongly suggest that vertical transmission played a major role in the spread of the epidemic.

Aedes↗
PubMedDate not supplied

New vectors of Rift Valley fever in West Africa.

After an outbreak of Rift Valley fever in Southern Mauritania in 1987, entomologic studies were conducted in a bordering region in Sénégal from 1991 to 1996 to identify the sylvatic vectors of Rift Valley fever virus. The virus was isolated from the floodwater mosquitoes Aedes vexans and Ae. ochraceus. In 1974 and 1983, the virus had been isolated from Ae. dalzieli. Although these vectors differ from the main vectors in East and South Africa, they use the same type of breeding sites and also feed on cattle and sheep. Although enzootic vectors have now been identified in West Africa, the factors causing outbreaks remain unclear.

Aedes↗
PubMedDate not supplied

Rift Valley fever outbreak, Mauritania, 1998: seroepidemiologic, virologic, entomologic, and zoologic investigations.

A Rift Valley fever outbreak occurred in Mauritania in 1998. Seroepidemiologic and virologic investigation showed active circulation of the Rift Valley fever virus, with 13 strains isolated, and 16% (range 1.5%-38%) immunoglobulin (Ig) M-positivity in sera from 90 humans and 343 animals (sheep, goats, camels, cattle, and donkeys). One human case was fatal.

Animals↗
PubMedDate not supplied

[Incidence of malaria and S hemoglobinopathy in the pediatric hospital milieu in Bamako, Mali].

A study on the incidence and gravity of malaria among children suffering of sickle cell anemia was carried out in the pediatric hospital of Bamako-Mali. On the 236 cases of fever studied, 54.2% were malaria infected and 21.2% were carriers of the sicklemic trait. There was a significant difference between malaria affecting AA children and HbS children, specially concerning parasites load.

Anemia, Sickle Cell↗
PubMedDate not supplied

[Epidemiology of human urban schistosomiasis in Bamako in Mali (the case of the "populous" quarter of Bankoni)].

From may 1989 to january 1990, we have studied parasitologic index in snails population, stools and urines examination in children (1-15 years) in one of the greatest "spontaneous" quarter of Bamako. 584 stools samples and 563 urines were tested. 4.717 snails were captured during six months. From all these data, we conclude that in Bankoni S. haematobium is mesoendemic (36.6%) and S. mansoni hypoendemic (3.4%). B. truncatus is the most important host for urogenital schistosomiasis. The two seasonal revers (Tienkole and Bankoni) are unfavourable to B. pfeifferi's production. B. globosus and B. forskalii are not frequent in this suburban area. This investigation, shows that a selective mass treatment with praziquantel is the better public health care strategy in Bankoni quarter.

Adolescent↗