The View host was hospitalized after injuring her head in a fall during inauguration festivities. She was transferred to a New York hospital late last week and remains there with her new infection.
"You all know that she fell and cut her head 10 days ago, and then was running a temperature, but it turns out it is all the result of a delayed childhood," her co-host Whoopi Goldberg explained on the air Monday.
"Barbara has the chicken pox. She'd never had it as a child," she continued. "So now she's been told to rest, she's not allowed any visitors, and we're telling you, Barbara, no scratching."
In a statement last week, Walters, 83, thanked her fans and "all the people who have called, written and been concerned about me."