Tuesday, the Sanders campaign became the first to cancel rallies due to coronavirus. It happened just days after both former Vice President Joe Biden and Vermont Sen. Bernie Sanders held events in Michigan in last-ditch attempts to drum up support ahead of Tuesday’s primary. The Biden campaign also followed suit, cancelling it’s Tuesday evening rally in Cleveland.

As the two Democratic candidates and the incumbent President Trump criss-cross the country, their campaigns have been grappling with the best way to deal with coronavirus without losing momentum in campaigning.

According to the CDC, 35 states now report cases of COVID-19 with 19 deaths and more than 400 cases. Globally, more than 100,000 people have been infected with some 4,000 deaths reported across nearly 100 countries. As many companies are forced to ask employees to self-quarantine and countries close borders, the presidential candidates continue to hold rallies, shake hands, and take photos with voters.

The CDC has advised the public to “avoid crowding” and to limit “attendance at larger gatherings.” The center has also warned against handshaking and says to use other “noncontact methods of greeting.”

The campaigns have remained largely quiet on any precautions they might be taking, as Bernie Sanders cancelled rallies in Ohio due to coronavirus. The state is set to vote on March 17 alongside Florida, Arizona, and Illinois.

”Out of concern for public health and safety, we are canceling tonight’s rally in Cleveland,” said Mike Casca, Bernie 2020 Communications Director. “We are heeding the public warnings from Ohio state officials, who have communicated concern about holding large, indoor events during the coronavirus outbreak. Sen. Sanders would like to express his regret to the thousands of Ohioans who had planned to attend the event tonight.”

The campaign went on to say that “all future Bernie 2020 events will be evaluated on a case by case basis.”

It represents a turnaround for the camp that was hesitant to provide details on the campaign’s concerns about the virus.

“We do not hold a rally without first conferring with public health officials,” Sanders told reporters Monday while speaking in Detroit. “It is an issue we think about a whole lot. We do not go forward without consultation with public health officials.”

But Sanders had stopped short of detailing any specific measures he’s taking to avoid getting sick.

“I’m running for president of the United States and that requires a lot of work,” he answered.

A campaign official told Yahoo Finance that “we will continue to take precautions advised by public health officials.”