the reason why i believe i got it was because my friend was starting back up in the sport and asked if he could house the pigeons he bought at my house till he put up a loft which i agreed to as we were racing partners a few years back, he brang in the bevverdam birds to be housed with my birds till he got a loft all looked full of health but i beleive it is these and overcrowding that caused the problem.Last year i found out another guy who bought birds from the same beverdam sale as my friend culled them all as they all had paratyphoid ! It was a hard and expensive lesson to learn and many good winners brang a tear to my eye! That was just in the stock. It only affected one section of the race team which was strange and this wiped out 3 federation and 7 club winners.Since then havent topped the federation for last 3 years and always used to top it at least once! It ruined my team and caused me to basically start back from scratch! Even those that had it and recovered after the jab where no good, so had to be removed. Its taken me three years to slowly build up a good team yet again,this year first year with what id say with a full team of pigeons. I jab my birds every year the treatment starts in novemeber with a 10day course of treatement and were jabbed on the 11thday! This year this was done and only two showed signs of a reaction these were my best racers last season. They may show signs of a reaction but as your birds have it they will not react the way birds that have it in a small dose as they sulking,and not eating for 2 days but the third day they are fine.This is due to i believe they have a bit of paratyphoid inside there system and the vaccine makes them have a paratyphoid overdose then the 3rd day its completely gone. All birds also have to be given a booster vaccination which can be anything from 21 days to 6 months! Hope this helps abit and shows the damage it had caused!