According to JYP Entertainment on March 14, NMIXX member Sullyoon has tested positive for COVID-19. 

The agency relayed on this day, "On the evening of March 13, Sullyoon experienced symptoms of a sore throat, and so all NMIXX members excluding Bae and Kyujin conducted tests via self-diagnosis kits. Sullyoon's kit showed a positive result."

JYPE continued, "All members excluding Bae and Kyujin thus visited the hospital to conduct rapid antigen tests, and as of March 14, Sullyoon's result has returned positive. Sullyoon has thus far completed her second dose of the COVID-19 vaccine and is not experiencing any abnormal symptoms other than a sore throat and a slight fever." 

As a result, NMIXX will be halting group activities temporarily while waiting on Sullyoon's recovery.