Wearing a volunteer’s red jacket and holding a nucleic acid testing flowchart in his hands, Duiu Onofrei stood out among the crowd at a nucleic acid sampling site in Zhaoshang Subdistrict, Nanshan District on Jan. 12.

Wearing an Iron Man T-shirt, Heráclito Everson Biscaia Filho from Brazil made his 34th blood donation in Shenzhen at Nanshan Blood Donation Station on Dec. 28. Hera, who has the rare AB RH negative blood type, is a frequent blood donor and has donated voluntarily and unpaid 34 times in Shenzhen.