Without knowing for sure though, who would want to take a chance. The drug has to be withdrawn slowly. Consult your doctor for more information, and don't get scared, be informed. Please don't get the impression that only those who are immunosuppressed can have problems with chickenpox. In fact about half of those who suffer complications or die each year are normal healthy people.
Vaccines prevent countless deaths each year.
Without them the number of valuable human beings we'd lose would be staggering. Yes, sadly, some injuries and deaths occur as a result of vaccines, but unfortunately, there are risks with every single drug we use. We have and will not ever reach perfection. We must remember that the benefits of our vaccines far outweigh the risks. Especially for those who are ill or immunosuppressed like Christopher was.