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. 1984 Apr;50(1):66–72. doi: 10.1128/jvi.50.1.66-72.1984

Pathogenesis of in utero infections with abortogenic and non-abortogenic alphaviruses in mice.

A R Milner, I D Marshall
PMCID: PMC255583  PMID: 6321801

Abstract

The initial stages of infection of pregnant mice at gestation day 11 with either the T48 strain of Ross River virus or avirulent Semliki Forest virus are similar. With both infections, a hematogenous spread of virus to the placenta occurs. The viruses subsequently replicate to high titer in all placentas and are able to persist in the presence of specific maternal antiviral antibodies. There is a delay of at least 1 to 2 days between the initial detection of virus in the placenta and the onset of fetal infection. With Semliki Forest virus, abortion occurred in all mothers and appeared to be preceded by infection of all fetuses. However, when Semliki Forest virus was given at other stages of pregnancy, abortion was less common, and in all non-aborted pregnancies at least one uninfected fetus was observed. This situation was similar to that with Ross River virus, in which abortion was not observed and fetal infection and death were only seen in a proportion of fetuses. Within each pregnancy, the outcome of the two in utero infections appeared to result from similar mechanisms, with the fate of an individual fetus depending upon the timing of the passive transfer of anti-viral immunoglobulin G from the mother relative to the timing of fetal infection by virus from the placenta. Although the passive maternal immunoglobulin G protected susceptible fetuses against infection, antibody did not mediate in utero recovery of infected fetuses or clear placental infection.

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Selected References

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