A 68-year-old man in Hubei Province, central China, where the new coronavirus first appeared in December, tested positive on Sunday, August 9, six months after being diagnosed with Covid-19 and cured.
Another man who contracted the disease in April after returning from the test test test tested positive in Shanghai on Monday, but showed no symptoms.
None of the patients’ close contacts tested for the virus, however, they were quarantined, the local government said.
These two cases are the most recent addition to an increasing number of “virus reactivation” anecdotes discovered in patients who have recovered from viral infection, which has sicked more than 20 million people internationally and killed another 748,000 people.
Although it is rare for recovered patients to test positive again, the phenomenon raises questions about why some patients have long-term symptoms and whether immunity to the disease would possibly be too ephemeral to oppose re-infection.
Some studies have shown that the point of protective antibodies that an inflamed user can collect to fight the virus decreases after only a few months, which can make them vulnerable to the same pathogen for a moment.
Related history No cases of covid-19 refection are known here, but the ministry is lurking related history Related effects of Covid-19 infection under review in Singapore However, there is little evidence that reinfection in this pandemic has occurred.
Some experts have raised the option for other cells to continue to provide immunity even after the antibodies have disappeared.
South Korean researchers have warned that the virus detected in patients months after recovery may be only dead viral waste remains that are no longer infectious.
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