The immune system works that way that even single digit amount of antibodies can start a chain reaction very quickly.
I don't think it's possible to say a yes or no answer if somebody has immunity using a lab test today.
Though, the vaccine is only needed to last long enough to eradicate the virus. If mass application of vaccine can plunge the r-factor well below 1, it should be more than ok if its protection only lasts 3-4 months.
I don't think it's possible to say a yes or no answer if somebody has immunity using a lab test today.
Though, the vaccine is only needed to last long enough to eradicate the virus. If mass application of vaccine can plunge the r-factor well below 1, it should be more than ok if its protection only lasts 3-4 months.