Physical Activity During the COVID-19 Stay-at-Home Order in Active Older Adults: A Qualitative Study.

To reduce the spread of COVID-19, in March of 2020, the state of Virginia issued a stay-at-home order requiring fitness center closures for 2.4 months. The purpose of this study was to explore how the fitness center closures influenced physical activity (PA) in older adults who previously participated in the centers' exercise classes.

A non-invasive test for prenatal diagnosis based on fetal DNA present in maternal blood: a preliminary study.

Background: Use of free fetal DNA to diagnose fetal chromosomal abnormalities has been hindered by the inability to distinguish fetal DNA from maternal DNA. Our aim was to establish whether single nucleotide polymorphisms (SNPs) can be used to distinguish fetal DNA from maternal DNA-and to determine the number of fetal chromosomes-in maternal blood samples.

Methods: Formaldehyde-treated blood samples from 60 pregnant women and the stated biological fathers were analysed.