NEW YORK (AP) — New York is starting to test healthcare workers for coronavirus antibodies and will do the same next week with transit and law enforcement workers as the state eases away from the worst days of the pandemic.

Gov. Andrew Cuomo said Saturday that doctors, nurses and other employees at four New York City hospitals that have handled high volumes of coronavirus patients will be the first tested under the new program.

Making such testing widely available is seen as a key to reopening society, but the World Health Organization on Saturday warned there is currently no evidence that people who have antibodies are protected from coronavirus.