BRIEF-CDC says 400 pregnant women in U.S. with evidence of Zika infection

July 21 (Reuters) - * U.S.. CDC says 400 pregnant women in u.s. With evidence of zika virus infection, up from 346 a week ago * U.S. CDC reports 3 more babies born in U.S. with birth defects linked to zika virus, taking total to 12 Source text for Eikon: Further company coverage: [ ] (Reporting By Bill Berkrot)