Coronavirus February 26, 2021 5:12 pm COVID-19 Cases on the Rise After Weeks of Decline Health experts say new strains could be behind the increase of cases. US & World Videos 1:39 Lawrence police cracking down on illegal dirt bikes 1:31 CDC recommends updated Covid shot for everyone ages 6 months and up 2:30 Putting an increase in COVID cases into context 1:41 COVID cluster prompts masking at Beth Israel Deaconess Medical Center 0:50 COVID cluster at hospital prompts return of mask requirement in affected unit