Nearly 90 percent of U.S. mayors who responded to a national survey on coronavirus preparedness said they lack sufficient tests kits, face masks and other protective equipment for their emergency responders and medical workers, while 85 percent said they do not have enough ventilators for their hospitals — critical shortages that could lead cities and towns to be quickly overwhelmed should the virus spread through their communities.

The U.S. Conference of Mayors survey, published Friday, was conducted from March 20 to March 24 and includes data from 213 U.S. cities in 41 states and Puerto Rico, representing a combined population of 42 million. The shortages of essential items and equipment the cities are facing “has reached crisis proportions,” according to the report.

“Despite their best efforts, most cities do not have and cannot obtain adequate equipment and supplies needed to protect their residents,” the report says. “This is a life-threatening crisis that will continue unless the federal government does everything in its power to help us safeguard our first responders and health care workers — our first line of defense — and the millions of other public servants in our cities whose work today puts them at risk.”