The Centers for Disease Control and Prevention is urging all pregnant women to get vaccinated against COVID-19. The advice comes as hospitals in hot spots around the U.S. see disturbing numbers of unvaccinated mothers-to-be seriously ill with the virus. The CDC recommendation echoes recent guidance from top obstetrician groups. The agency had previously encouraged pregnant women to consider vaccination. Pregnant women run a higher risk of severe illness from the coronavirus. But their vaccination rates are low.