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Originally Posted by themartianchick
That is a claim that Sweden has made but it doesn't really fit with the science. There is no proof that having had the COVID-19 virus actually makes you immune to getting it again as a full-blown (or even asymptomatic) illness. There have been some people in other countries who have gotten it a second time. They are just as contagious the 2nd time around and can spread it to others, especially if they don't take precautions and re-quarantine.
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The science actually suggests that some people recovered and then showed symptoms again. Here is a piece from US Health and there are several other valid sources.
South Korea recently reported that a significant number of people with COVID-19Trusted Source have tested positive, then tested negative, only to test positive and experience symptoms, like fever, cough, sore throat, and fatigue, again.
Health officials in South Korea say it’s unlikely these patients got reinfected with COVID-19 a second time since they’re testing positive for a second time so soon, but rather that some people with COVID-19 may be experiencing a viral reactivation.
Health experts in the United States don’t think a reactivation of COVID-19 is likely since we’ve never observed viral reactivation in other coronaviruses.
It could very well be that the virus never left their system. It lingered, and they were never fully cured of the disease, and that’s what the subsequent COVID-19 tests are catching.
The World Health Organization (WHO) says we don’t have enough evidence to understand if and why some people may experience reactivation after recovery.