Growth of Salmonella enteritidis in Yolk of Shell Eggs from Normal and Seropositive Hens

Author:

BRADSHAW JOE G.1,SHAH DHIRENDRA B.2,FORNEY EVELYN3,MADDEN JOSEPH M.2

Affiliation:

1. 1Division of Microbiology, Food and Drug Administration, Cincinnati, Ohio 45226

2. 2Division of Microbiology, Food and Drug Administration, Washington DC 20204

3. 3Cincinnati District Office, Food and Drug Administration, Cincinnati, Ohio 45202

Abstract

The growth of Salmonella enteritidis inoculated into the yolks of shell eggs from normal and seropositive hens was determined at various temperatures. All eggs were inoculated with approximately 1 colony-forming unit (CFU)/g of yolk. In eggs from normal hens, the organism multiplied with a generation time of 25 min, reaching a density of about 108 CFU/g in 12 h at 37°C. A generation time of 3.5 h was observed in eggs incubated at 15.5°C, a temperature frequently used for commercial storage of eggs. Cell density of >107 CFU/g was reached in 4 d at 15.5°C. No multiplication was observed in eggs incubated at 7°C for 94 d. When inoculated eggs from seropositive birds were incubated at 37°C, the organism multiplied with a generation time of 35 min, reaching a cell density of >106 CFU/g in 12 h. Raw egg white was detrimental to cells, reducing cell viability 50% in 4 h at 37°C. The limulus amoebocyte lysate test gave a positive reaction with whole liquid egg containing <103 CFU/g. A protocol is suggested for possible application of this test in epidemiological studies that screen grade A shell eggs for Salmonella contamination.

Publisher

International Association for Food Protection

Subject

Microbiology,Food Science

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