Common Human Coronaviruses
Businesses may choose to keep vaccination requirements in place. Epsilon,Theta, and Zeta were at one point listed as variants of interest and were downgraded by the WHO. The WHO labeled it a “variant under monitoring” in April 2021, meaning some of its characteristics may pose a future risk to humans. As of September 2021, the CDC hadn't escalated Mu to being a variant of interest in the U.S. The agency intends to keep tracking it along with the other variants. In the U.S., the CDC says Mu reached a peak in June 2021, when it made up less than 5% of variants going around the country. What To Do If You Have Or Might Have Covid In contrast, a booster dose is recommended for people who are vaccinated and whose immune response weakened over time. Research suggests that getting a booster dose can decrease your risk of infection and severe illness with COVID-19. Most people infected with the virus will experience mild to moderate respiratory illness and recover without requiring spec...