Stephen Ellison came to the aid of a woman who slipped on rocks at the side of the river in Zhongshan village.
Russia has so far exported the vaccine to four destinations, including the UAE.
The 40-year-old suspect was held on Thursday last week hours after the incident, in which nobody was hurt.
"There is no time for complacency," WHO chief Tedros Adhanom Ghebreyesus warns, however.
The finding comes as video game sales this year have boomed as more people are stuck at home because of the pandemic.
Last week the Commission reached a deal with Pfizer and BioNTech on the supply of their potential Covid-19 vaccine.
'We're working very closely with the company,' says health minister.
A wealthy Chinese put down a world record price for the Belgian-bred bird New Kim
Necessity is not the mother of invention when it comes to the pandemic and Europe’s great chefs