Infection by Salmonella typhymurium, S. agona, S. enteritidis or S. infantis of chicks with caecal coccidiosis

Abstract

1. Experimental infections of Salmonella typhimurium, S. agona, S. enteritidis or S. infantis were studied in chicks infected with Eimeria tenella.

2. In all experiments, 4‐d old birds were given 5 daily oral doses of approximately 10⁴ salmonella organisms per bird. One day before this inoculation one group of birds received a single dose, in the range 1X10⁴ to 4X10⁴ sporulated oocysts of E. tenella per os whilst the other group was not inoculated and served as the control. Chicks were examinedpostmorten 7,10 or 14 d after receiving coccidia.

3. With S. typhimurium infection, the number of salmonellas in the caeca of the E. tenella‐inkcted birds was greater than in those infected only with salmonella.

4. With S. agona and S. enteritidis, the counts of salmonella in the caeca and the numbers of birds positive for salmonella in the caeca and liver were greater in the E. tenella‐'mtecttd birds.

5. The rate of infection of S. infantis was not increased by caecal coccidiosis.