“I think most members are in good shape,” he added. “But it does attack older people like myself. But again, it’s a lot like the flu in terms of the way it interacts — without a vaccine.”

Sen. Tim Kaine (D-Va.), 62, said he doubled the number of paid sick days for his staffers on Monday to encourage them to stay home if they are sick. But those who have been infected with the virus often do not show symptoms for several days, and he acknowledged that it will be difficult for those who work in the Capitol to remain healthy.

“You can’t just not shake people’s hands,” Kaine said. “We are in a profession where we are with a ton of people and we are interacting with them in ways where even if it’s a disease where you can be asymptomatic and transmit. It’s challenging.”

Both the House and Senate are scheduled for a weeklong recess next week, and in the meantime lawmakers will grapple with twin — and often competing — priorities: protecting themselves, but also standing ready to legislate on a possible economic stimulus package.

Lawmakers are also worried about inducing potentially unnecessary panic among Americans, and said it was too early to consider operational changes like barring tourists or asking staffers to work from home.

So far, Senate leaders have not hinted at any imminent changes to the chamber’s schedule that could keep lawmakers on recess for longer. The matter was not discussed at the Senate GOP leadership meeting on Monday evening, according to an attendee. And Speaker Nancy Pelosi said there was no reason to alter the congressional calendar “at this time.”

But on Sunday and Monday alone, there were new reasons for senators to be alarmed about their daily and weekly routines.

Republican Sen. Ted Cruz announced he would self-quarantine this week at his home in Texas after coming into contact with an attendee at the Conservative Political Action Conference who later tested positive for the coronavirus. Rep. Liz Cheney of Wyoming opted against attending a House GOP retreat over the weekend, citing concerns about transmitting the virus to vulnerable family members.

Two additional House Republicans — Doug Collins of Georgia and Matt Gaetz of Florida — announced they, too, would self-quarantine. Both men interacted with the president in recent days: Collins shook hands with him last week and Gaetz rode with him on Air Force One on Monday.

Senate Majority Leader Mitch McConnell thanked Cruz for staying home “out of an abundance of caution” and urged his colleagues to listen to health experts.

“Our great nation is very strong,” he said. “We have enormous expertise and tremendous capabilities.”

On top of that, the Centers for Disease Control and Prevention issued new guidance on Sunday warning the elderly and those with underlying health conditions against taking long flights. The federal government’s guidance has changed almost daily as officials learn more about the coronavirus and its effects on the human body, and lawmakers said they are prepared for more restrictions.

“I’m on an airplane twice a week for an hour or two each time and there will come a point where they’re going to tell me that’s not a smart thing to do,” Durbin acknowledged.