In a roundup of scientific studies on the novel coronavirus, a small study suggests no traces of mRNA vaccines end up in mothers’ breast milk and a gene called IFI27 that becomes activated early in Covid-19 might help identify people most likely to have contracted the virus after coming in contact with an infected person.

Parents and caregivers should be aware of the three ways children can get the vitamin D they need, according to a new resource published in the medical journal JAMA Pediatrics.