There are at least 30 known mutations of the virus
Post# of 714
This is why I keep saying that people should not be too sanguine about there being an effective virus soon. Even Oxford, which seems to be the first out of the gate with a candidate, says that they are hoping for an 80% success rate. That is not great -- still 1 in 5 people would be susceptible.
It's also why these idiots who say the want to get the virus now so they'll have immunity should think again. Not only do we NOT know if getting it once gives you immunity -- it might not give you immunity to whatever the next mutation is. And WORST OF ALL -- it could be something like chicken pox, which lurks in your body for decades, and then erupts with a vengeance in a different form of the disease -- Shingles. Or it could be like HIV -- it never leaves your body at all.