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How long can a virus keep attacking me – especially when I’ve been previously infected? How long do my antibodies survive in my blood? How long does a vaccine defend my immune system against an intruder?
Fuente: Youtube
How long can a virus keep attacking me – especially when I’ve been previously infected? How long do my antibodies survive in my blood? How long does a vaccine defend my immune system against an intruder?
Fuente: Youtube
