Thread by @yangliuxh

2nd #COVID19 case seems to have emerged in #Beijing, as Haidian district's Baiwangmoliyuan community 百旺茉莉园小区 has undergone quarantine. On-site health worker reportedly said 1 resident was tested positive after developing a fever late Mon.

#Beijingoutbreak At Jan. 18 presser, 3 more cases were announced, in addition to the 1st case on Jan. 15. case 2 was the mother of the 1st case, case 3, resident of Baiwangmoliyuan, worked on the same floor with case 1. Case 4 was a migrant worker in Chaoyang district/3

#Beijingoutbreak Case 4 developed flu symptoms on Jan. 14 and went for testing on Jan. 17. Results returned on Jan. 18 showed he's infected w/ Delta variant. Case 4 was on a train to Weihai, Shandong province when he was notified of the result and has been quarantined. /4

#Beijingoutbreak @XHNews on possible "surface-to-human" transmission: officials say "it can't be ruled out" that 2 recent cases in Beijing & Shenzhen were infected when contacting foreign-sourced objects, but tracing is still ongoing to determine true origin./5

#Beijingoutbreak The reason for possible "surface-to-human" transmission is samples collected from both patients shared high similarity those reported in N. America, but not to any known cases in China. Top CDC scientist Wu Zunyou suggested "surface-to-human" transmission /6

#Beijingoutbreak needed 3 factors, 1. the object was "heavily contaminated";2, virus survived for an extended period on such surface (e.g. in low temperature) ; 3, no proper protective measure was adopted when contacting the object. /7 news.cn/politics/2022-…

Beijing residents have gotten the * sign on their tracing app. (the * sign indicates the city has sections deemed as medium/high risk, but not an indicator that the carrier has been to those sections). In practice, the * would mean more restrictions and checks while traveling.