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Appl Environ Microbiol. 1985 June; 49(6): 1467-1471

Laboratory infection of chicken eggs with Campylobacter jejuni by using temperature or pressure differentials.

A G Clark and D H Bueschkens

ABSTRACT

Fertile chicken eggs were infected in our laboratory with Campylobacter jejuni suspensions by using temperature or pressure differential methods of inoculation. After 2 days of incubation, over 90% of the eggs carried C. jejuni when iron was present in the inoculum. This percentage declined rapidly until by day 8, less than 10% of the eggs were detectably infected. However, up to 11% of hatched, healthy chicks carried C. jejuni in their intestinal tracts. The isolated organisms were of the same serotype as the initial inoculum. C. jejuni was recovered without difficulty when the intestinal tracts of chicks were enriched, but recovery from early dead-in-shell or infertile eggs was poor. This poor recovery and the rapid decline of C. jejuni after 2 days of egg incubation suggest that the vibrio is sensitive to some part of the incubating egg or to the temperature of prolonged incubation. It was impossible to predict which eggs would yield infected chicks on the basis of the number of organisms taken up by each egg, and no correlation existed between the number of organisms taken up and the efficiency of the hatch, i.e., the hatch ratio. If iron was omitted from the inoculum broth, the egg infection rate at day 2 was lower.

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Appl Environ Microbiol. 1985 June; 49(6): 1467-1471

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