Well, I am not sure if they have gotten stronger or anything, but they definitely have changed. Like all viruses, they mutate so our immune system cant protect us. It is like the cold and flu. There are tons of different mutations or variations of the same virus. I think that is why they havent come up with a vaccine for the sv*. I know they have a vaccine for the flu, but they work hard on it since it actually kills people. Doctors/Scientists/Chemists/Whoever have to predict the strains of flu that are expected to hit the world. Then they create the flu vaccine based on what they predict will hit. It takes a lot of work, and they arent right every time. But I sure wish they would TRY to make a vaccine for the SV*. I would be first in line to get it!!!!
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