NIH recently convened an expert panel to develop standardized criteria to define placental COVID-19 infection.
The National Institutes of Health and the Eunice Kennedy Shriver National Institute of Child Health and Development recently convened a panel of experts to develop recommendations that would further inform ongoing studies of COVID-19 in pregnancy.
Until now, researchers have used a variety of methods to diagnose placental COVID-19 infection, which made it difficult to interpret and compare results across studies and establish definitive evidence about its risks. As a result, a virtual panel of experts in obstetrics, virology, placental pathology, infectious disease, immunology, and molecular biology recently determined new standardized criteria.
The recommendations, published in the American Journal of Obstetrics and Gynecology, include techniques to detect COVID-19 replication, viral transcripts, or proteins in placental tissue. Guidance related to the handling of the placenta, examination, and sampling, as well as the use of validated reagents and sample protocols, was also given.1
The experts recommend the following detection methods:
The experts advised that the most scientifically rigorous technique available should be used. Depending on which approach is used, the likelihood of COVID-19 placental infection can be classified as follows:
Scientific papers reporting on placental COVID-19 infection should include the sampling method (location and number of samples collected), time from delivery and method of sample preservation, and detection technique. Other important issues to include are the timing of the maternal infection in relationship to delivery, maternal disease severity, and the strain of the virus, if known.
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