[Course of HIV2 seroprevalence at the National Hospital of Niamey (Niger)].

About the 25,368 serological tests done among the different groups of the population at the biological laboratory of the National Hospital of Niamey from March 1987 to May 1990, the author studied the seroprevalence evolution of the infection HIV2. A regular fall for the HIV2 appeared in this period. The author tries to explain this fall of the HIV2 in a country newly infected by the HIV by the lower infectivity of the HIV2 and/or a failure to adjust of this virus in Niger.

[The seroprevalence of human immunodeficiency virus infection (HIV) in the Touaregs and Peuls Bororo in Niger].

A seroepidemiological study of endemic treponematosis (bejel) in Niger allows us to realise an anonymous non correlated screening of VIH infection in Nomads: Touaregs of Tchirozerine (Agadez), Peuls Boro of Bermo (Maradi). On the 424 Touaregs screened only one was seropositive to VIH2 infection confirmed with Western blot that means 0.23% of seroprevalency comparable to that 0.

[The seroprevalence of human immunodeficiency virus infection (HIV) in patients with tuberculosis at the National Hospital of Niamey, Niger (1990-1991)].

This study has been planned in order to determinate the frequency of the infection by VIH among the 394 new tuberculous, for a period extended from July 1990 to July 1991 at the section of pneumophtisiology in the National Hospital of Niamey. The number of seropositives is 7.6%.

[Seroprevalence of human immunodeficiency virus infection (HIV) in the central prison of Niamey (Niger)].

A study on seroprevalency among six hundred and sixty prisoners incarcerated at the central prison of Niamey (Niger) where toxicomania by intravenous injection is inexistant but homosexual probability does exist, the prison being a very closed circle, showed that 0.45% of the prisoners where carrying the anti body anti-HIV. This rate being about the same found in the general population 0.

[Evolution of the seroprevalence of HIV-1 and HIV-2 infections in the national hospital of Niamey, Niger].

For 25,368 serologies examined in the biological laboratory of National Hospital of Niamey, Niger, from March 1987 to May 1990, the authors studied seroprevalence HIV1, HIV2 and HIV1 + HIV2 during this periode in the different groups studied: Blood donors, in women patients of child bearing age, pregnant women, prostitutes, prisoners and during systematic visits. It appears there is a tendancy of an increase in HIV1, a decrease in HIV2 and relative stability for the two profiles together.