A german virologist stated that about 60-70% in Germany needs to get infected to stop the spreading of the disease. He justified that every infected person infects 3 others. So first week 1, second week 3, third 9 and so on. To stop this you need to get below 1 new patient every week and to reach that 2 out of 3 people needs to be immune. That means 66% of immune people either because they were infected or there is a new serum to get immune. But there are also news that you can get it twice, so to get the disease once doesn‘t mean you are definitely immune if the reports are true.
