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  • Title: Salmonella enteritidis phage type 4 from the contents of intact eggs: a study involving naturally infected hens.
    Author: Humphrey TJ, Baskerville A, Mawer S, Rowe B, Hopper S.
    Journal: Epidemiol Infect; 1989 Dec; 103(3):415-23. PubMed ID: 2691262.
    Abstract:
    Two small flocks of egg-laying hens, naturally infected with Salmonella enteritidis, were housed in individual cages so that their eggs could be identified. During a longitudinal study where the contents of 1,119 eggs were examined, 11 were positive for S. enteritidis. One isolate was phage type (PT) 33 the others were PT4. The production of infected eggs was clustered though intermittent. The positive eggs, which were produced by 10 of the 35 hens, were all found to contain fewer than 10 salmonellas. Some birds were also apparently carrying S. hadar PT14 as this organism was isolated from the contents of six cracked eggs.
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