Originally Posted by
Denti
Heard the official advise in germany, where testing is easy to come by and, as the originator of the most widely used test, has been available quite early. The health institute (Robert-Koch-Institute) expects that around 60 to 70% of the population will be infected as long as no vaccination is available as there is no immunity against it and that is the figure needed for herd immunity. That said, quite a large number of the infected will not display any symptoms, therefore will usually not be tested, generating quite a large hidden number of infected and spreading persons. Of those positively tested around 20% will develop into a severe case.
Denti's talking epidemiology
Covid19 spreads like the common cold; so, a strong probability just about all of us will be exposed to it over the next few years. Identified cases tend to be the severe ones, but at least that denominator (positive tests) is known. Silent infections are likely a much larger denominator that we don't really know at present.
As for a vaccine, they've been trying for many decades to develop one against a fellow coronavirus, the common cold.