Fate of Listeria monocytogenes in orally dosed chicks

Competitive exclusion in poultry––30 years of research

“…In addition, CE treatment decreases mortality due to necrotic enteritis and hepatitis and reduces levels of caecal C. perfringens, which is one of the causative factors in necrotic enteritis (Barnes, Impey, & Cooper, 1980;Craven et al, 1999;Elwinger et al, 1992;Kaldhusdal et al, 2001;Snoeyenbos, Weinack, & Soerjadi, 1983). In a 7-day study, CE treatment also significantly reduced caecal colonisation by L. monocytogenes (Hume, Byrd, et al, 1998) though according to another study, most chicks were able to eliminate the organism from the body within 9 days without any treatment (Husu, Beery, Nurmi, & Doyle, 1990).…”

Competitive Exclusion Treatment in Poultry Management

“…Also, CE treatment can decrease mortality due to necrotic enteritis and hepatitis and reduce levels of cecal C. perfringens, which is considered the main causative factor in necrotic enteritis (Barnes et al, 1980;Snoeyenbos et al, 1983;Elwinger et al, 1992;Hofacre et al, 1998;Craven et al, 1999;Kaldhusdal et al, 2001). Furthermore, CE treatment significantly reduced cecal colonization by L. monocytogenes in chicks (Hume et al, 1998a), although according to another study, most chicks became Listeria-negative within 9 days without treatment (Husu et al, 1990).…”

Reduction of caecal Listeria monocytogenes in Leghorn chicks following treatment with a competitive exclusion culture (PREEMPT ™ )

“…However, less than 5% of mature broilers in a positive flock may be carriers of L. monocytogenes (Dijkstra 1976). Caeca in experimentally inoculated broiler chickens were found to be the primary sites for colonization (Husu et al 1990). Husu et al (1990) suggested that the carrier status and infection rates vary between flocks and may be influenced considerably by husbandry practices.…”

“…Caeca in experimentally inoculated broiler chickens were found to be the primary sites for colonization (Husu et al 1990). Husu et al (1990) suggested that the carrier status and infection rates vary between flocks and may be influenced considerably by husbandry practices. A survey of seven farms in Denmark revealed that 62% of the feed samples and 33% of pooled faecal samples collected from broilers and transport cages were positive for L. monocytogenes, and that Listeria spp.…”

“…Indications from sometimes conflicting reports suggest that an important step in reducing carcass contamination at the end of processing would be to prevent or limit the entry of L. monocytogenes into the processing plant. Susceptibility of poultry to colonization by L. monocytogenes decreases with age (Bailey et al 1989 ;Husu et al 1990). Similar to findings with salmonellae (Sadler et al 1969 ;Fuller 1977 ;Lloyd et al 1977), the increased resistance in susceptibility to Listeria is probably the result of the development of a mature protective microflora in the lower digestive tract that competitively excludes the establishment of potentially pathogenic bacteria.…”