A worker fills out a form providing her information before donating blood at the Wuhan Blood Center in Wuhan, the city hit hardest by the novel coronavirus pandemic in Central China's Hubei province, April 1, 2020. The center arranged some 60 workers and workers' family members to donate blood to meet the clinical demands in the city. To secure its safety, the donated blood will undergo viral nucleic acid and antibody tests. (Photos: China Daily)

A doctor checks a worker before allowing her to donate blood at the Wuhan Blood Center in Wuhan, Central China's Hubei province, April 1, 2020.

A doctor checks a worker before allowing him to donate blood at the Wuhan Blood Center in Wuhan, Central China's Hubei province, April 1, 2020.

A doctor draws blood from a worker at the Wuhan Blood Center in Wuhan, Central China's Hubei province, April 1, 2020.

A doctor draws blood from a worker at the Wuhan Blood Center in Wuhan, Central China's Hubei province, April 1, 2020.

A doctor draws blood from a worker at the Wuhan Blood Center in Wuhan, Central China's Hubei province, April 1, 2020.