Resolves based on the result of the planned CDC study being reported here:

CDC to study potential links between vaccines and autism despite research showing no connection

It’s unknown whether Robert F Kennedy Jr, who has promoted anti-vaccine views, is involved in study

Resolves YES if the CDC's findings are that there is a link, may be a link (even if it's just under certain conditions), or anything other than no evidence of a link. Resolves NO if they find there's no evidence suggesting a link. Resolves N/A if the results are never published, the study is shelved, or the CDC ceases to exist.