Natural and experimental infections of Arcobacter in poultry

Enteric Diseases and Food Safety Research Unit, National Animal Disease Center, USDA, Agricultural Research Service, Ames, Iowa 50010, USA. iwesley@nadc.ars.usda.gov

Arcobacter butzleri causes human enteritis and is frequently recovered from poultry carcasses. The purpose of this study was to determine 1) the natural distribution of A. butzleri in poultry and 2) its relative pathogenicity in experimentally infected poultry. Cloacal samples (n = 407) were collected on four occasions from three flocks of chickens. Overall, Arcobacter spp. were recovered from 15% of the birds; A. butzleri was identified in 1% of cloacal samples. Three experimental trials were conducted to determine the susceptibility of birds. In Trial 1, 3-d-old chicks (n = 62) were divided into three groups and infected per os with 1) A. butzleri American Type Culture Collection (ATCC) 49616, 2) a suspension of four field strains of A. butzleri isolated from retail purchased chicken, and 3) Campylobacter jejuni (positive control). Arcobacter was not detected in cloacal swabs or in cecal samples of chicks through Day 5 postinfection; C. jejuni was detected in cloacal swabs of all positive control birds. In Trial 2, 5-d-old outbred turkey poults (n = 88) were infected as described above with the addition of a group infected with a suspension of four field strains of A. butzleri from turkey meat. Arcobacter butzleri was recovered from either cloacal swabs or cecal contents of only 6.0% of birds (4 of 67); C. jejuni was recovered from 100% of the positive control birds (n = 21). In Trial 3, 3-d-old turkey poults of the highly inbred Beltsville White strain (n = 141) were experimentally inoculated. In contrast to earlier trials, A. butzleri was recovered overall from the cloacal swabs or tissues of 65% of the turkeys.

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