Editor's note : Because of the intense, ongoing, global research efforts related to Covid-19, it's difficult to get an accurate picture of the unknown factors. Here are some of the many as-yet-unanswered questions
|Why does the virus have much more serious effects in older people?||current research||partially understood|
|Were less virulent variants in circulation prior to the major Wuhan outbreak?||current research||unknown|
|Has the virus reached peak virulence / infectivity?||current research||unknown|
|Will anti-viral drugs eventually be able to cure the disease?||current research||partial results|
|What is the incidence of 'Long Covid'?||current research||estimated only|
|What range of symptoms does 'Long Covid' present?||current research||under review|
|How long-lasting are the symptoms of ‘Long Covid’?||current research||unknown|
|How long does vaccine protection last?||current research||estimated only|
|How long do infection-generated antibodies remain effective?||current research||estimated only|
|Which other mammals can contract covid?||current research||Growing list|
|Which can transmit to humans?||current research||not known|
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