the flu basically has one of the highest mutation rate, only HIV is higher. they do it in 3 parts, antigenic shift, genetic drift, and recombination, the last one makes it more dangerous, they can recombine with more than 1 different strain to make a new one, that was the case with h1n1.
the flu basically has one of the highest mutation rate, only HIV is higher. they do it in 3 parts, antigenic shift, genetic drift, and recombination, the last one makes it more dangerous, they can recombine with more than 1 different strain to make a new one, that was the case with h1n1.