Dr. Oxiris Barbot resigned as New York City’s health commissioner, saying in her resignation letter that “the Health Department’s incomparable disease control expertise was not used to the degree it could have been.”

“I leave my post today with deep disappointment that during the most critical public health crisis in our lifetime, that the Health Department’s incomparable disease control expertise was not used to the degree it could have been,” her resignation letter said, taking aim at Mayor Bill de Blasio’s administration.