This is an issue that every organization, every candidate has got to deal with, he said.
Federal health authorities have been advising older people and those with medical conditions, in particular, to avoid crowded spaces, prompting the cancellation of music and arts festivals and other events around the country.
On Sunday, Surgeon General Jerome Adams noted that the average age of death for people from the coronavirus is 80, while for those needing medical attention, it is 60.
But that so far hasn't led President Donald Trump or his two remaining major Democratic rivals, Sanders and Joe Biden, to cut back on big campaign events. Each man is in his 70s.
Sanders said in the best of all possible worlds the three candidates should probably limit their travel and avoid crowds, but right now, we're running as hard as we can.
Sanders planned a meeting Monday in Detroit with public health experts and others to discuss the outbreak.
Trump on Saturday said he wasn't worried about the coronavirus getting closer to the White House after the first case in the nation's capital was confirmed over the weekend.
Officials also said an attendee of a recent political conference where Trump himself had spoken also tested positive for the virus.
No, I'm not concerned at all. No, I'm not. We've done a great job," Trump said.
The Trump campaign said Sunday it is proceeding as normal amid the outbreak, though it has yet to announce the president's next rally.
Adams, acknowledging Trump's busy public schedule, said for many Americans life can't stop and that ultimately the goal was to minimize risk the best as possible.
But speaking of being at risk, the president, he sleeps less than I do, and he's healthier than what I am, he said.
And so that's the other reason that this messaging is hard, because there are 70-year-olds who run marathons and are healthier than some 30-year-olds.
If people are going to go out there, we want them to be extra cautious we want them to wash their hands frequently, Adams said.
The U.S. death toll from the virus has climbed to at least 21, with all but three victims in Washington state. The number of infections swelled to more than 500, scattered across the U.S.
Still, concerns about the spreading virus haven't stopped thousands from thronging campaign rallies in recent days.
At a Trump rally last week in Charlotte, North Carolina, the virus threat didn't deter enthusiastic fans who shared buckets of chicken fingers in the stands and dunked their hands into shared vats of popcorn while they awaited the president's arrival.
Sanders drew more than 7,000 to a convention hall in downtown Detroit on Friday night and his campaign said 15,000 people attended his rally in Chicago's Grant Park on Saturday.
Mercedes Lopez, a 56-year-old who owns a restaurant in Grand Rapids and attended an open-air Sanders rally in the city's downtown on Sunday, said she's not afraid of the virus.
She said she sees the government's increased concern as a plot to distract the electorate from other, negative things that are occurring, such as increasing petty crime and official corruption.
There's a virus but it's not at the level they are saying. It's to distract people, Lopez said.
Lopez added that she wasn't worried about attending an event with such a large group, saying, I'm calm. I'm not going to worry about it because the more you think about, 'I'm going to protect myself against this one thing or this other thing,' it becomes impossible. You can't protect yourself from everything.
Sanders appeared on CNN's State of the Union," NBC's Meet the Press, and ABC's This Week, and Adams spoke on CNN and CBS' Face the Nation.
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