A positive COVID-19 test forced Irene Aldana out of her first main event booking in the UFC.

Aldana, a Mexican bantamweight contender, withdrew from UFC on ESPN+ 31, causing her showdown with former champion Holly Holm to be postponed. UFC president Dana White announced the news earlier Wednesday, but reasons for the switch weren’t disclosed until hours later, with Aldana (12-5 MMA, 5-3 UFC) sharing on Instagram that her withdrawal was the result of contracting coronavirus.

Aldana is still recovering from the virus but said she’s feeling much better after a tough few days battling symptoms. She looks forward to recovery and a new date for her bout with Holm.

Aldana, 32, coming off a first-round knockout win over top contender Ketlen Vieira in December at UFC 245. Aldana is 5-1 in her past six outings in the UFC. The Lobo Gym product is considered one of the leading title contenders in the division.