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Endemic infections with the common avian pathogen  Salmonella enterica  subspecies  enterica  serovar Typhimurium ( Salmonella  Typhimurium) may incur a significant cost on the host population. In this study, we determined the potential of endemic  Salmonella  infections to reduce the reproductive success of blue ( Cyanistes caeruleus ) and great ( Parus major ) tits by correlating eggshell infection with reproductive parameters. The fifth egg of each clutch was collected from nest boxes in 19 deciduous forest fragments. Out of the 101 sampled eggs, 7  Salmonella  Typhimurium isolates were recovered. The low bacterial prevalence was reflected by a similarly low serological prevalence in the fledglings. In this study with a relatively small sample size, presence of  Salmonella  did not affect reproductive parameters (egg volume, clutch size, number of nestlings and number of fledglings), nor the health status of the fledglings. However, in order to clarify the impact on health and reproduction a larger number of samples have to be analyzed. Phage typing showed that the isolates belonged to the definitive phage types (DT) 193 and 99, and multi-locus variable number tandem repeat analysis (MLVA) demonstrated a high similarity among the tit isolates, but distinction to human isolates. These findings suggest the presence of passerine-adapted  Salmonella  strains in free-ranging tit populations with host pathogen co-existence.

Salmonella Typhimurium DT193 and DT99 are present in great and blue tits in Flanders, Belgium