The Centers for Disease Control and Prevention (CDC) reports that no Michigan counties are at high risk for COVID-19 as of March 31. The state has 14 counties at a medium risk level and 69 at low risk. Counties at medium risk are located mainly in the Upper Peninsula and along the east coast of the Lower Peninsula. The CDC assigns risk levels based on COVID-19 infections and hospitalizations. Even as cases decrease, experts advise those living in medium or high-risk areas, regardless of vaccination status, to consider wearing masks indoors to minimize transmission. High-risk counties have new cases above 200 per 100,000 residents, or at least 10 new COVID-19 hospital admissions per 100,000, or at least 10% of the inpatient beds occupied by COVID-19 patients. While most counties see cases dropping, the Illinois Department of Public Health (IDPH) reports that 13 of the state's counties are at medium risk for COVID-19, one more than last week, with no counties at high risk for the second week in a row. The state has confirmed 4,109,047 COVID-19 cases and 36,600 deaths across 102 counties as of March 31. The IDPH encourages those who test positive to seek treatment quickly, and is offering 1 million free COVID-19 rapid antigen tests to Illinois residents outside of Chicago. Pennsylvania has no counties at a high risk level for the second consecutive week, and 62 are at low risk, while five are at a medium risk level.