Former Vice President Joe Biden Joe BidenSenate Republicans face tough decision on replacing Ginsburg What Senate Republicans have said about election-year Supreme Court vacancies Biden says Ginsburg successor should be picked by candidate who wins on Nov. 3 MORE and Sen. Bernie Sanders Bernie SandersKenosha will be a good bellwether in 2020 Biden's fiscal program: What is the likely market impact? McConnell accuses Democrats of sowing division by 'downplaying progress' on election security MORE (I-Vt.) bumped elbows in lieu of shaking hands ahead of the Democratic debate on Sunday.

The moment, which was a first in presidential debate history, comes as the U.S. begins imposing new restrictions in an effort to limit social interactions among individuals as the coronavirus spreads across the country.

Joe Biden and Bernie Sanders elbow bump as the 11th Democratic primary debate kicks off. pic.twitter.com/FQnXX7ioo8 — Axios (@axios) March 16, 2020

The debate was moved from Arizona to studios in CNN's Washington, D.C., bureau last week amid concerns over the virus. Sanders's and Biden's debate podiums were several feet away from each other, and only three hosts were present in the studio.

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Sunday's debate did not feature a spin room, press filing center or live audience.

Journalist Jorge Ramos even backed out of his role as a moderator last week due to possible exposure to the coronavirus; however, he is symptom-free.

Biden and Sanders have addressed the virus, releasing plans to combat the outbreak and hosting virtual events to inform voters on the issue.

More than 3,244 cases of the virus have been confirmed in the U.S. so far, with a total of 62 deaths nationwide, according to the Johns Hopkins University data.

State and city officials across the U.S. have announced sweeping restrictions in an effort to prevent the number of cases from rising.

The governors of Illinois and Ohio announced Sunday they would close all restaurants and bars in response to the pandemic.