It is best not to take a bath within three days of BCG vaccination, and if there is no discomfort, you can usually take a bath after three days.
BCG vaccination is mainly for the prevention of tuberculosis, BCG vaccination will appear delayed hypersensitivity reaction, the site of BCG vaccination is usually in the upper arm, after the vaccination may be localized pus, recurrent infections, and a hard lump will form in the later stage, generally do not take a bath within three days before the vaccination, so as not to lead to skin infections, which will affect the effect of the vaccine.
After three days, the wound gradually recovered, you can take a proper bath, mainly shower, do not take a basin bath, after the bath and then use a clean towel to wipe dry the site of BCG vaccination.