today it could be a longer wait. we were hoping that would be by halloween, but if it spills over into november, it spills over, because that s the necessary amount of time that the fda needs. reporter: in chicago, sisters sydney and sophia hughes just got their second moderna shot as part of a vaccine trial for 6 to 11-year-olds. i think it was really important to have their de demographics represented. reporter: the family hopes taking part in the trial shows other african-americans who may be hesitant that the vaccine is safe. i have been exposed to covid and now that i m in the vaccination trial, i realize how important it is. reporter: and the cdc is also recommending the vaccine for women who are trying to get pregnant, as well as those who have recently given birth. officials are concerned about the low vaccination rates and say they are seeing more data showing pregnant women getting