[Effect of an alphavirus infection in pregnant mice on the susceptibility of their progeny to homologous infection in the postnatal period].

Infection of random-bred mice with Sindbis virus at various intervals of pregnancy results in increased resistance of their offsprings to infection with this virus in the first days after birth. Antibodies present in the colostrum and milk of immunized females play an important role in decreasing the susceptibility of sucklings to alphavirus infection.