Bra gällande återinfektion:
"The science surrounding these apparent reinfections is further complicated by China’s handling of the outbreak, which since January has been marred by faulty testing procedures and questionable case counting methods with shifting definitions. In addition, the overburdened healthcare system has put pressure on doctors to discharge people who may not have fully recovered to free up beds for newly infected patients.
China has been praised in recent weeks by the World Health Organization for containing the virus. But the Communist Party’s early moves to suppress public knowledge on the extent of infections prompt concerns over the accuracy of information about recovered patients who retest positive but may have been misdiagnosed in the first place.
Such cases account for less than 0.2% of China’s total infections — not enough to cause alarm. But they are raising questions in China about the reliability of diagnostic tests, the possibility of reinfection and whether patients are wrongly designated as “recovered” and released too early from hospitals."
https://www.latimes.com/world-nation/story/2020-03-13/china-japan-korea-coronavirus-reinfection-test-positive