Detection of salmonellae in hen eggs in Thailand.
Two thousand four hundred and ninety eggs were collected from retail markets in 6 provinces and from laying hen farms in 3 provinces. Eggs were pooled in groups of 3 to obtain 830 samples for testing. Isolation of salmonellae was made from both egg shell and egg contents. Eggs from retail markets were contaminated with salmonellae on egg shells (13.2%) and in egg contents (3.9%). Three (0.4%) samples yield positive both on egg shells and in egg contents. Of the 86 samples from laying hen farms, salmonellae were found on egg shells and in egg contents, 3.5% and 1.2%, respectively. From the 134 strains tested, twenty-four serotypes were confirmed. Salmonella cerro, S. amsterdam and S. typhimurium were predominantly encountered, 4.8%, 4.3% and 1.4%, respectively. Only two samples were contaminated with S. enteritidis, one each from open market and laying hen farm, one on egg shells and the other in egg content respectively.
Department of Veterinary Public Health, Faculty of Veterinary Science, Chulalongkorn University, Bangkok, Thailand.
K
K
Saitanu
C
C
Koowatananukul
J
J
Jerngklinchan
J
J
Sasipreeyajan
D000818:Animals; D002645:Chickens; D004528:Egg Shell / Q000382:microbiology; D004531:Eggs / Q000382:microbiology*; D005260:Female; D005516:Food Microbiology; D012475:Salmonella / Q000145:classification / Q000302:isolation & purification*; D012703:Serotyping; D013785:Thailand