Entertainment Pfizer, BioNTech start testing COVID-19 vaccine in pregnant women By reuters/nh - February 19, 2021 0 941 Facebook Twitter Pinterest WhatsApp CHICAGO: Pfizer and BioNTech have started an international study with 4,000 volunteers to evaluate the safety and effectiveness of their COVID-19 vaccine in healthy pregnant women, the companies said on Thursday (Feb 18). Pregnant women are at…