Determination of bacterial species pathogenicity involved in egg incubation pathology

Abstract

For 73 bacterial strains, represented by Proteus vulgaris (21 strains), Escherichia coli (29), Staphilococus aureus (29) and Salmonella typhimurium (5), isolated from embryos and chickens dead after hatching, we have determined in vivo pathogenicity. The culture medium incubated for 24 hours was inoculated intraperitoneally in mice. From the 73 bacterial strains, 52 of them (65.77%) proved to be pathogenic, which killed mice, according to the bacterial strain, during 18-72 hours, while 25 strains (34.23%) were not pathogenic. In some bacterial strains without pathogenicity, inoculated in mixture (Proteus vulgaris + Escherichia coli and Proteus + Staphilococcus aureus), we noticed a synergic reaction expressed through pathogenicity in mice.