That was the idea - but it failed. Type 2 does not exist in the wild, it's all from vaccine derived. It got so bad they stopping giving type 2 vaccine, but then people have no immunity to the vaccine derived version - but if you give the vaccine, then the vaccine causes more cases (of type 2) than it's stopping.
There's no solution here - either option makes things worse.
So I hope the new version of the vaccine works, because otherwise this will fail.
Type 3 appears basically extinct - both in the wild, and vaccine derived. Only type 1 still exists in the wild, and vaccine derived type 2.
There's no solution here - either option makes things worse.
So I hope the new version of the vaccine works, because otherwise this will fail.
Type 3 appears basically extinct - both in the wild, and vaccine derived. Only type 1 still exists in the wild, and vaccine derived type 2.