5:21ABC NewsSeptember 3, 2020Epidemiologist warns ‘we all have to remain vigilant’ABC News contributor and epidemiologist Dr. John Brownstein discusses the latest on COVID-19 vaccine trials and treatments.Up Next in newsEpidemiologist on elevated COVID-19 rates in Latino communityJuly 7, 2020The 2024 total eclipse seen across North AmericaApril 8, 2024Sandra Day O'Connor, 1st woman on Supreme Court, dies at 93December 1, 2023