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Protection of the placenta offers opportunities of future study of prevention of COVID-19 transmission — ScienceDaily

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Researchers from Boston Medical Center’s Maxwell Finland Laboratory for Infectious Diseases have identified properties in placenta tissue that may play an important role in preventing the transmission of COVID-19 from a mother with the virus to her fetus.

The study results demonstrate that the COVID-19 virus universally invades the placenta in cases with and without evidence of fetal infection, highlighting the protection that the placenta may offer against COVID-19 infection as current data indicates a less than five percent COVID-19 transmission rate in newborns from their mothers. Published in Placenta, these results underscore the importance of using placenta tissue in COVID-19 research studies aimed at developing novel ways to diagnose, treat and prevent COVID-19 virus transmission.

For this study, the researchers examined placental tissue, which shares many developmental and physiological similarities with the lung and the immune response of the small and large intestine, making it a key source of human tissue that can be used for ongoing COVID-19 research. It also contains a unique expression pattern of COVID-19 receptors that are different from other organs, which could be helpful in the development of COVID-19 treatments.

“The results of this study provide evidence for ongoing research of COVID-19 infection at the maternal-fetal interface as means to better understand virus transmission and infection in other human tissues,” said Elisha Wachman, MD, a neonatologist at Boston Medical Center, associate professor of pediatrics at Boston University School of Medicine, and principal investigator of this study. “Previous research has shown that the placenta protects the fetus from various types of infection, and exploring the particular ways in which it protects the fetus from COVID-19 transmission may help identify new targets of COVID-19 prevention and treatment.”

Throughout April and May 2020, samples from 15 COVID-19 positive maternal-fetal dyads were collected for this study; five cases had evidence of fetal transmission. The placental tissue of the positive cases was analyzed and compared with ten COVID-19 negative controls.

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Materials provided by Boston Medical Center. Note: Content may be edited for style and length.

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