Submitted to: American Veterinary Medical Association Abstract
Publication Type: Abstract Only
Publication Acceptance Date: April 15, 2002
Publication Date: July 15, 2002
Citation: Gast, R.K., Holt, P.S. 2002. Effect Of Prior Serial In Vivo Passage On The Frequency Of Deposition Of Salmonella Enteritidis In Eggs From Experimentally Infected Laying Hens. American Veterinary Medical Association Abstract. Technical Abstract: Experimental infection models are important tools for studying the deposition of Salmonella enteritidis inside eggs. Oral inoculation is often employed in such experiments because it is believed to closely simulate naturally occurring S. enteritidis infections of chickens, but relatively low egg contamination frequencies have been obtained in many recent oral infection studies. The present study considered whether repeated in vivo passage of a phage type 13a S. enteritidis strain in chickens would affect its subsequent frequency of deposition in eggs by experimentally infected hens. The incidence of egg contamination was determined in groups of hens inoculated orally with the original isolate or with derivatives obtained after prior serial passage and re-isolation from tissues of infected hens. Passaged S. enteritidis isolates, especially those recovered from reproductive organs, were associated with a higher incidence of egg contamination than the original strain in some trials.