It is not known how many truck drivers have gotten sick from the coronavirus, according to trucking industry groups. But the largest union representing truck drivers, the International Brotherhood of Teamsters, said thousands of its members in the New York region reported having symptoms of Covid-19, the disease caused by the virus.

To better protect drivers, many trucking companies have provided them with disinfectant, masks and gloves. Some have also encouraged drivers to stay inside their trucks when possible.

The trucking association has ordered 16,000 masks to give out free to drivers and others who need them, and is looking into buying hand sanitizer in bulk.

“They are out there and they are putting themselves at risk,” Ms. Hems said. “Being exposed and getting sick from Covid-19 is a very big concern.”

Ralph Blasi wipes down his seat with disinfectant before heading out to deliver milk, eggs, cheese, yogurt and bottled water to supermarkets, bodegas, nursing homes and hospitals in Queens and on Long Island. He takes along a mask and hand sanitizer to use after handling cash payments.

Some nursing homes no longer allow him inside, so he leaves their orders at the door. Others require him to pass a medical check — taking his temperature and medical history — and that can add 10 to 15 minutes to each delivery.

For his trouble, Mr. Blasi, 53, actually earns less than he did before. His last weekly paycheck was just under $1,200, down from his average of $1,350, he said. Even though supermarkets are ordering more, he is making fewer deliveries overall and earning less commission with so many restaurants closed.