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101
Bacteriological and other Examinations
The following samples were submitted to the Public Health Laboratory for
bacteriological examination. Articles marked with an asterisk were suspected of
having caused food poisoning. No organisms likely to be responsible were found.
Ice Cream and Ice Cream Mix 174
Ice Lollies 8
Pasteurised Milk (Frozen) 2
Whole Dried Egg 72
Skimmed Milk Powder 3
Whole Milk Powder . 1
*Sausages 1
Spray Dried Egg Albumen 18
*Cooked Beef 1
Frozen Strawberries and Sugar 1
Strawberry Puree 2
Samples of milk were submitted to the Public Health Laboratory for examination under the Milk (Special Designations) Regulations, as follows:-
Methylene Blue Tests 186 (of which 2 were void, the atmospheric
shade temperature being over 65 ˚F )
Phosphatase Tests 186
All samples were satisfactory.
The 174 samples of ice-cream and ice-cream mix were submitted to the
Ethylene Blue Test of which 22, 13%, were graded in provisional grades 3
and 4 as against 12% during 1959.
As in 1958 the plate counts association with these low graded samples
ware comparatively low, and there is little doubt that in the majority of cases
the low methylene blue grading were due to a heat resistant organism such as
bacillus cereus.
Again, the greater number of these apparently less satisfactory results
ware obtained from one manufacturer. The firm concerned was made fully aware
of the results of the tests and decided to take the opportunity of renewing
certain parts of its plant during the winter 1960/61. A new homogeniser, two
new pumps, and a new stainless steel surface type mix cooler, with covers, are
being fixed to replace the existing ones. Next season's results will be examined
with interest.