Isolation of Salmonella from Flies in the Mekong Delta, Vietnam

Abstract

From July 2004 to April 2005, total of 494 flies, including 128 houseflies (Musca domestica) and 366 blowflies (Genus Calliphora), were captured at 6 pig farms, at a slaughterhouse and at 2 wet markets in the Mekong Delta, Vietnam to know the role of flies as a transmitter of Salmonella. Salmonella were isolated from 38 (7.7％) of the 494 flies samples. The isolation rates of Salmonella from flies captured at a slaughterhouse (15.5％) were significantly higher than that in pig farms (4.5％) and in wet markets (6.5％). The isolation rates of Salmonella from blowflies (9.8％) were higher than those houseflies (1.6％). From those 38 Salmonella-positive fly samples, 41 Salmonella strains were isolated and 14 serovars were identified. The predominant serovars were S.

Bacterial contamination of chicken meat in slaughterhouses and the associated risk factors: A nationwide study in Thailand

“…In contrast to closed slaughterhouses, these facilities allow for more unfettered contact between flies and carcasses, thereby increasing the possibility of cross-contamination since some flies presented in slaughterhouses (approximately 15%) could carry viable Salmonella spp. [ 67 ].…”

Prevalence of Salmonella and Escherichia coli O157 from Acute Diarrheic Children in the Mekong Delta, Vietnam

“…However, we could not detect E. coli O157 : H7 in diarrheic patients even in bloody stools as the same previously reported in Vietnam 3,21,22,24) as well as in Thailand 8) and in Korea 10) although this pathogen has been isolated in a strain (O157 : NM) from 111 diarrheic children in Hanoi 2) as well as in diarrheic children in China 7) . This result hopefully indicates the limited circulation of E. coli O157 : H7 in diarrheic children in the Mekong Delta, Vietnam although this pathogen was isolated from cattle in this area 18) . Therefore, occurrence of gastroenteritis associated with Salmonella in children and the presence of multi-drug resistance constitute an important public health problem.…”

“…Multi-drug resistance occurred in all S. Typhimurium isolates and S. Paratyphi B. Likewise, all S. Typhimurium isolated from flies were resistance to one or more antimicrobials agents tested 18) . The result indicates that S. Typhimurium showing multi-drug resistance in this area may be originated from the same source.…”