Abstract
ABSTRACTOut of 728 enterococcal isolates recovered from 208 samples of milk and milk products, 216 isolates (29.7%) produced deoxyribonuclease (DNase), but among them only 31 (4.3%) were capable of exhibiting thermonuclease (TNase) activity. The incidence of DNase positive enterococci was maximum (63.4%) in Kulfi mix, but the number of thermonuclease positive enterococci was maximum (9.6%) in nonfat dry cow's milk. DNase positive enterococci were encountered in 78 (37.5%) samples, whereas only 22 (10.6%) of the samples showed the presence of thermonuclease producing enterococci. Although 30 samples (14.4%) contained staphylococcal TNase, thermonuclease of nonstaphyloccal origin was actually detected in 7 such samples. The latter, however, did not contain either Staphylococcus aureus or their enterotoxins.
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