The sero-epidemiological study carried out in Senegal consisting of 10 main points taken from two very different geographical areas--Senegal river and Lower Casamance, based on the evidence of anticorps against the hepatitis A virus (anti-HAV) showed that: 1) the speed of infection in very young children; 2) the large spread of this virus in rural african communities, accounted for by the living and hygiene conditions favours the spread to large numbers of people by way of mouth of the original enteric virus i.e. that of the hepatitis A.
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