Due to the novel coronavirus (COVID-19) outbreak in the United States, Biden, the presumptive Democratic nominee, has been running his presidential campaign from home since mid-March.
Former US Vice President Joe Biden visited a veterans memorial in Delaware on Monday, making his first public appearance in weeks.
Biden and his wife, Jill, both wearing black masks, were seen laying flowers at Delaware Memorial Bridge Veterans Memorial Park.
President Donald Trump, with his wife Melania, commemorated Memorial Day by laying a wreath at the Tomb of the Unknown Soldier.
Biden has been out of the public eye, complying with the coronavirus-induced quarantine, since early March, when he canceled a campaign rally in Cleveland scheduled for 10 March.
Since the start of the outbreak, the US has registered more than 1.6 million cases of COVID-19, including over 98,000 fatalities, the Johns Hopkins University count shows.