MorningMist
Nowadays a BCG vaccination is only given to someone with a higher risk of contracting TB. It is no longer a routine vaccination as used to be the case. It’s not clear whether the OP’s son was given this vaccination, which would have been administered in the upper arm and not have required ‘stripping off’, which I interpret as removal of all, or almost all, clothing, or some other treatment or examination was given. If social workers had to be involved there is obviously something amiss.
Presumably the vaccination was given in the arm which wasn't plastered? In which case it might be difficult to administer without taking a jumper off.
Just trying to make sense of it.