3 ms·
These variants have their most severe symptoms blocked by the same vaccine with very similar effectiveness. Influenza viruses, on the other hand, undergo recomb
by bonzini 5y ago
These variants have their most severe symptoms blocked by the same vaccine with very similar effectiveness. Influenza viruses, on the other hand, undergo recombination in such a way that the vaccine has to be engineered every year based on guesses of what the prevalent strain is going to be.