Infections of Covid-19 that were contracted during earlier waves will provide little to no protection against the current subvariant, BA.5, dominating US cases, Dr Anthony Fauci said.
“Omicron as a broad category has been particularly problematic,” the director of the National Institute of Allergy and Infectious Diseases said Tuesday during a White House briefing on the spread of a variant that now accounts for more than 60 per cent of cases in the country.
