>> i didn't get to say good-bye to my mom or my dad, no. and that's what hurts me the most. >> reporter: and tonight, with testing still a major problem in more than a dozen states, our own abc news/fivethirtyeight report revealing the disparity minorities face, finding testing sites are more scarce in black and hispanic neighborhoods and they're often understaffed, leading to much longer wait times. the virus infecting 25-year-old arizona mother bertha, two weeks before the birth of her second child. bertha dying during childbirth. her last words, accord okay. ll take care of my son." >> just a horrific story. victor oquendo with us from a testing site there in miami beach tonight. and victor, two questions for you. first, a new study tonight on how soon antibodies might fade after infection? >> reporter: david, that study from "the new england journal of medicine" looked at 34 patients who developed antibodies and in many cases, it found that those antibodies wore off after just 90 days.