Following up the question: Shall I Sign for Measles Vaccine, here is the update. We finally signed the letter, and had Yifan injected the Measles Vaccine.
Few days before, immediately after Beijing reassured everyone that it is voluntary, the kindergarten Yifan attended posted a poster and said, it is mandatory. Although they offered a form of two choices, they said any claim not to inject will be invalid, and should be chose again…. The kindergarten closed at 12:00 at noon in Friday, and ask parents to bring their kids to do the injection.
So, based on the information I collected, although not 100% sure, we feel OK to have it. Hope everything is fine. If anything happens, it is about 100 million kids that we are talking about.