Возможно ли повторное заражение Ковидом?

kilativ — 16.07.2020 Ну вот есть пример повторного заражения, причем второй раунд болезни был ХУЖЕ первого. Причем тут точно в наличии второй раунд заражения - прошло много времени между первым и вторым заражением, вирус не детектировался в промежутке.

Then, over in Vox, D. Clay Ackerly, an internal medicine and primary-care physician practicing in Washington, D.C., described a 50-year-old patient who tested positive, suffered the effects, tested negative twice, then tested positive again with more severe symptoms a second time, about six weeks later:
https://www.nationalreview.com/the-morning-jolt/a-look-at-the-reinfection-rate/

Может это единичный случай, может у пациента был иммунодефицит (хотя вряд ли, тогда этот факт наверняка был бы упомянут), нужно больше примеров прежде чем начинать паниковать. Однако, родственные сезонные коронавирусы таки не дают устойчивого иммунитета, что напрягает:

While the mechanisms of adaptive immunity to pandemic coronavirus SARS-CoV-2 are still unknown, the immune response to the widespread endemic coronaviruses HKU1, 229E, NL63 and OC43 provide a useful reference for understanding repeat infection risk. Methods: Here we used data from proactive sampling carried out in New York City from fall 2016 to spring 2018. We combined weekly nasal swab collection with self-reports of respiratory symptoms from 191 participants to investigate the profile of recurring infections with endemic coronaviruses. Results: During the study, 12 individuals tested positive multiple times for the same coronavirus. We found no significant difference between the probability of testing positive at least once and the probability of a recurrence for the beta-coronaviruses HKU1 and OC43 at 34 weeks after enrollment/first infection. We also found no significant association between repeat infections and symptom severity but strong association between symptom severity and belonging to the same family. Conclusion: This study provides evidence that re-infections with the same endemic coronavirus are not atypical in a time window shorter than 1 year and that the genetic basis of innate immune response may be a greater determinant of infection severity than immune memory acquired after a previous infection.
https://www.medrxiv.org/content/10.1101/2020.04.27.20082032v1

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