1. frequency of fever
with increasing dose of DPT is higher, than the previous one, so if son was febrile that was due to the increasing dose (2nd booster dose in your son) of the vaccination
, and is caused due to the Pertusis component of DPT,which can be reduced by using DPaT (a is for acellular P component)
2. 15 days has gone by,so Anaphylaxis
reaction could not be the possibility?
3. what other clinical observation and lab. investigations were carried out to exclude other causes? could be Allergic pathology?
4. at this moment your health care provider is the best judge in this matter,have confidence in them,they will work out the cause sooner,because DPT vaccine
is mainly related with Neurological deficit.