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Two more patients tested positive for coronavirus in Nassau County, bringing the total on Long Island to 20, including a pair of school bus drivers, officials said Tuesday.

Update: Long Island Coronavirus Cases Reach 31

As a result of the development, several schools have canceled classes Tuesday to allow cleaning crews to disinfect the campuses. The county Department of Health’s disease detectives have contacted most of the families of the 80 students that ride the pair of affected school buses, and those who have not yet been contacted will be shortly.

“We’re taking extra precautions to protect the well being of all our residents, with a particular focus on our seniors, by altering practices and deep cleaning facilities,” Nassau County Executive Laura Curran told reporters Tuesday in Mineola.

The number of cases in New York State increased to 173, and more than 760 cases were reported nationwide, including 26 deaths. The new LI total does not include an Uber driver from Queens who New York City officials said had driven around LI.

Health officials in Nassau added that 72 people are in mandatory quarantine, 74 are in precautionary quarantine, and 10 tests are pending.

Nassau officials said they have also issued $5,000 fines for price gouging to a pharmacy in Island Park and a convenience store in Hicksville that allegedly were selling overpriced masks. A Glen Head pharmacy was also issued a warning. And Nassau consumer affairs officials urged the public to send tips to pricegouging@nassaucountyny.gov

Officials continued to urge the public to thoroughly wash their hands, use hand sanitizer, and those who don’t feel well to stay home and contact their healthcare provider. Seniors and those with compromised immune systems are again urged to avoid large crowds.

“We have to protect our seniors, those are the ones most at risk,” Curran said. “Those with compromised immune systems and people who are not so young are most at risk. And the whole point of what we are talking about is containing as many people we can with confirmed cases to contain and isolate them as much as we can so we can keep our seniors safe.”

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-With Timothy Bolger