You need to take the child to a general hospital as soon as possible so that they a mantoux test and if the child does not react appropriately, your doctor will request your child to do a chest Xray. If none is present, then the child will have to be vaccinated again with BCG. If the child has the normal reaction to Mantoux expected for a child who has been immunized with BCG, there will be no need for another BCG vaccine.