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Research from several institutions, including the California National Primate Research Center at UC Davis, suggests that more women could be losing their pregnancies to the Zika virus without knowing they are infected. According to the study, 26 percent of nonhuman primates infected with Zika during early stages of pregnancy experienced miscarriage or stillbirth even though the animals showed few signs of infection.
The rates of fetal losses and stillbirths in Zika-infected pregnant monkeys were about four-fold higher than what is normally seen in unexposed monkeys, many fetal and placental tissues had evidence of Zika virus replication and pathological lesions, which shows the role Zika virus. Previous research measured miscarriages and stillbirths in women who displayed signs or symptoms of the virus.
A recent study of infected women found that 5 percent did not carry to term or had stillbirths. Zika virus is causes microencephaly and other malformations in developing fetus. Zika disease in human adults includes fever, rash, headache, joint, red eyes and muscle pain. The timing of infection is an important predictor of fetal loss. Exposure during the first trimester of pregnancy is more likely to result in fetal death.
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