Its true it does especially as it can cause so many different , often vague symptoms
such as lameness, sterility, nervous symptoms similar to paramyxovirus,weight loss,poor hatchability and nestling mortality
And the problem is made worse by indiscriminate use of antibiotics
-expose the germs to antibiotic at too low a dose or for too short a time to kill them and it is only a matter of time before they 'learn' how to resist it and that's another one to add to the list that doesn't work anymore.
Tests for the disease are also expensive as it needs 3 negative droppings samples tested a week a part to be sure a bird is clear.
It is also more common than than one would expect - A study by Baay conducted in the netherlands during 1983 found that at the end of the racing season 67%of race baskets were infected with paratyphoid
(baaij,j. 1983 Salmonellose by Postduiven. Een studie overepidemiologie en preventie. 3,17-18,33.)
Of course not all symptoms mentioned can be attributed to paratyphoid but it is definately something to be born in mind!
Lofty