[Report of the Medical Officer of Health for Port of London] page 34

City of London 1936

[Report of the Medical Officer of Health for Port of London]

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Date. 1936.	Sample.	Result of Analysis.	Action taken.
May 4	Oysters, tinned	Condition of sample—good.	None.
		General appearance—good. 1. Number of micro-organisms developing on Gelatin (aerobically) at 68° F. (three days) averaged 1,103 per cubic centimetre.
		2. Number of micro-organisms developing on Agar (aerobically) at 98° F. (48 hours) averaged 683 per cubic centimetre.
		3. Bacillus coli (typical) absent from 50 to 0.0001 per cubic centimetre of sample.
		4. Coliform organisms—nil.
		5. Other organisms— B. Welchi—not present. Streptococci—not present. Plate cultures for Typhoid and Food Poisoning groups—negative.
		Remarks—A very satisfactory sample.
June 10	Drinking Water	Condition of sample—Good. General appearance—Bright and Clear.	None.
		No. of micro-organisms developing on gelatin (aerobically) at 68°F. (3 days), averaged 120 per c.c.
		No. of micro-organisms developing on agar (aerobically) at 98°F. (48 hours), averaged 300 per c.c.
		Bacillus coli. (typical) absent from 50 to 0.001 c.c. of sample.
		Coliform organisms B. La aeorogenes present in 10 c.c. of water. Other organisms. Streptococci and B. Welchi not present. McConkey plates for Enteric Group-Negative.
		Remarks.—Although B. Coli (typical) is absent in 50 to 0.001 c.c. of the water, the presence of B. La aerogenes indicates that this water is only of fair quality.
July 16	Canned Mussels	Condition of sample—good.	None.
		General appearance—Smells and tastes good.
		No. of micro-organisms developing on gelatin (aerobically) at 68°F. (3 days) averaged 1,263 per c.c.
		No. of micro-organisms developing on agar (aerobically) at 98°F. (48 hours) averaged 80 per c.c.
		Bacillus Coli (typical) absent from 50 to 0.001 c.c. of sample.
		Coliform organisms. Not present. Other organisms. Streptococci and B. Welchi.— not present.
		Remarks.—The bacteriological findings are satisfactory and indicate that the mussels are fit for human consumption.
„ 20	Ship's Milk	No. of bacteria per c.c.—All plates uncountable after 24 hours' incubation.	Letter to Shipping
		Presence of Bacillus Coli in 1/10 c.c. (24 hours)— Acid and gas.	Company concerned.
		Remarks.—This milk was curdled when received at the Laboratory; all plates were heavily overgrown after 24 hours incubation, and presumptive B. Coli was present in 1/10 c.c. of milk after 24 hours. Plate culture for typhoid and food poisoning group were negative. In my opinion this specimen of milk is unsatisfactory on account of its high microbic content and B. Coli. content.	Company concerned.