[Teratogenic effect of the Venezuelan equine encephalitis virus: a review of the problem].

This research reviews the teratogenic effects (disturbances in fetal development) of the Venezuelan Equine Encephalitis virus infection, points out similarities between the effects of this infection and the Rubella virus, and proposes experimental animal models for further examination.

Overview of the Research

• This research piece highlights the problem of the teratogenic effects of the Venezuelan Equine Encephalitis (VEE) virus infection. Teratogenic effects refer to the disturbance of the development of an embryo or fetus, potentially leading to birth defects.
• The viral alterations induced in the womb by the VEE virus infection are examined and compared to those induced by the Rubella virus. Rubella, also known as German measles, is a disease that can cause serious congenital disorders if a woman is infected during pregnancy.

Findings from Previous Research

• The study refers to findings by Wenger in 1967 that observed massive cerebral necrosis (brain tissue death) in the fetuses of women presumed to be suffering from encephalitis.
• It also refers to the development of an animal model in the late 1970s to early 1980s that allowed for these effects to be studied in depth.

Pathogenesis and Effects of VEE Infection

• The pathogenesis (the biological mechanism that leads to a diseased state) of the intrauterine infection appears to be related to changes in the placental vessels. The placenta, an organ that develops in the uterus during pregnancy, provides oxygen and nutrients to the growing baby and removes waste products from the baby’s blood.
• Vascular changes in the central nervous system were also observed in rats that survived the experimental VEE infection; these changes were similar to those seen in the brains of children with post-Rubella syndrome.

Recommendations for Future Research

• The research emphasizes the need for multidisciplinary studies in areas where VEE is endemic. This will help to detect sequelae (a condition that is the consequence of a previous disease or injury) of the viral effects in utero (while the baby is still in the womb).
• Lastly, this study proposes experimental animal models for further investigation into the various aspects of the intrauterine effects of the VEE virus.