Case reports involving coinfection withandin broiler chickens andin broiler breeding hens in Poland.

Abstract

The study describes three clinical cases of infection withspp.. In case no. 1, respiratory clinical signs and high mortality (0.7-4.2% daily; total 21.2%) in Ross 308 broiler chickens were shown to be caused by coinfection with sequence type 9 ofpresumptive serotype A andpresumptive serotype B. The identical (pulsed-field gel electrophoresis) restriction pattern (pulsotype) of sevenisolates indicated that infectious coryza in broilers was caused by the same clone. In cases 2 and 3, sudden increased deaths in Ross 308 broiler breeders (especially males) with lesions in the endocardium (valvular or mural endocarditis) were shown to be caused by. Among nine antibiotics tested, florfenicol was the only antibiotic to which allandisolates were susceptible. Out of the eight antibiotics tested, 11isolates from both clinical cases of infective endocarditis were susceptible to penicillin, amoxicillin, doxycycline and florfenicol. Theisolates tested in both clinical cases had different PFGE patterns (pulsotypes), but identical within a case. The causes of infectious coryza and infective endocarditis in the cases presented have not been determined. In the prevention of infectious diseases in large-scale livestock farming, it is very important to follow the rules of biosecurity.