SALMONELLA-ENTERITIDIS PHAGE TYPE-4 ISOLATES MORE TOLERANT OF HEAT, ACID, OR HYDROGEN-PEROXIDE ALSO SURVIVE LONGER ON SURFACES

In a comparative study of different Salmonella enteritidis phage type 4 isolates we found that those isolates with enhanced heat tolerance a lso survived better than isolates that wire heat sensitive either at p H 2.6, in 10 mM H2O2, or on surfaces. Culture to the stationary phase increased the heat tolerance of all isolates and the acid and H2O2 tol erance of heat-tolerant isolates. With heat-sensitive isolates, howeve r, extended culture had no impact on survival in H2O2 and only a margi nal impact on acid tolerance. The growth phase had no appreciable impa ct on the surface survival of any of the isolates.