In this April 23, 2020 file photo, a sign is seen by the entrance of the Centers for Disease Control and Prevention in Atlanta, Georgia. (TAMI CHAPPELL / AFP) LOS ANGELES – The United States now joins a list of about 30 other countries with circulating vaccine-derived poliovirus (cVDPV) identified by the World Health Organization, […]
In this April 23, 2020 file photo, a sign is seen by the entrance of the Centers for Disease Control and Prevention in Atlanta, Georgia. (TAMI CHAPPELL / AFP) LOS ANGELES – The United States now joins a list of about 30 other countries with circulating vaccine-derived poliovirus (cVDPV) identified by the World Health Organization, […]