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ЦитатаNEW DELHI: Cases of coronavirus re-infections have been reported in the national capital, making many question exactly how long antibodies to fight the virus are effective. 
One hospital under the Delhi government which is also a designated Covid-19 facility recently reported that five of its doctors have gotten reinfected with the virus for a second time, a claim which was later confirmed by an official who did not wish to be named.
“The doctors have been conducting Covid-19 duties. They had earlier tested negative for the virus and were therefore cleared for duty again in their respective wards. But somehow they got infected again, and this time, three out of the five are facing serious complications. Last time they were asymptomatic but now they are showing severe symptoms."
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A similar case was detected at Sir Ganga Ram Hospital as well. A healthcare worker at the hospital who presented symptoms suggestive of acute viral illness was tested positive for the virus by RT-PCR. 
The patient was initially admitted to a Covid facility for three days but later the patient was shifted to home quarantine for 17 days in view of the mild nature of her illness. 
She was tested again before joining work at the hospital and was found to be negative for Covid-19. She resumed her daily activity and went back to her normal life. 
After 2 months, she developed a fresh episode of cough, generalised weakness and malaise. The patient was investigated and was found to be Covid-19 positive once again. 
She was readmitted to the Covid ward after being diagnosed. During the course, the patient was tested for Covid-19 antibodies but her antibody levels were negative.

https://www.newindia…30319.html
Один из госпиталей в Дели сообщил о пяти случаях реинфекции КОВИД-19 среди докторов. В первом случае, речь шла о асимптоматичном заболевании, сейчас у заболевших серьезные симптомы.
Аналогичный случай отмечен в другой больнице. Сотрудница госпиталя была протестирована на ковид после появления симптомов ОРВИ и затем находилась на домашнем карантине 17 дней, после чего, выздоровление было подтверждено отрицательным тестом.
Она вернулась к нормальной жизни, но, спустя 2 месяца, симптомы появились вновь и тест на ковид стал снова положительным. Проведенный тест на наличие антител оказался отрицательным.

К слову, в Южной Корее задокументировали случай двухкратной реинфекции у молодой женщины:

ЦитатаResults. At the time of the positive retest, we were able to acquire a complete genome sequence from patient 1, a 21-year-old previously healthy woman. In this patient, through the phylogenetic analysis, we confirmed that the viral RNA of positive retest was clustered into a subgroup distinct from that of the initial infection, suggesting that there was a reinfection of SARS-CoV-2 with a subtype that was different from that of the primary strain. The spike protein D614G substitution that defines the clade “G” emerged in reinfection, while mutations that characterize the clade “V” (ie, nsp6 L37F and ORF3a G251V) were present at initial infection.  Conclusions. Reinfection with a genetically distinct SARS-CoV-2 strain may occur in an immunocompetent patient shortly after recovery from mild COVID-19. SARS-CoV-2 infection may not confer immunity against a different SARS-CoV-2 strain

Здоровая женщина, 21 год. Две  реинфекции после перенесенного заболевания. Подтверждено секвенированием генома вируса. (И слава богу. Хронический ковид с обострениями был бы гораздо хуже.)
https://watermark.si…NmGnghjo3O