| hepatitis a antibodies: prevalence and persistence in a group of mexican children. | the prevalence of antibodies against hepatitis a virus (anti-hav) was evaluated in sera from 275 asymptomatic infants and children under the age of five years and in 46 maternal-cord serum pairs, followed by sera obtained thereafter each month from the first to the fifth month of life in 29, 17, 9, 9 and 7 infants (a total of 163 serum samples). anti-hav was found in all cord blood sera, but its prevalence declined progressively to 0% among 19 infants aged eight months. four (25%) of 16 children ... | 1985 | 2981126 |