covid testing January 12, 2022 1:22 pm CDC Director on When to Get a COVID Test Rochelle Walensky, Director of the Centers for Disease Control and Prevention, explains when people should get tested for COVID-19. US & World Videos 2:27 Mother speaks out after school shooting threat in Milton 0:39 Police respond to incident in Whitinsville 2:31 Billerica police sergeant killed in crash honored at funeral 2:05 MIT monitors pair of opposing protests on campus 3:41 Cool air to linger over Boston into the weekend