[Report of the Medical Officer of Health for Port of London] page 41

City of London 1935

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

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Date. 1935.	Sample.	Result of Analysis.					Action taken.
May 7	Chinese Tinned Fish	Contents of tin—coarse fish cut up (? Haddock), and clear yellow oil. No free gas—odour unpleasant. Under sterile conditions, portions of fish were chopped into small pieces, and a mixture of 70 c.c. oil and fish pieces to 100 c.c. was made.					None.
		Results:—
		1. Direct plating of fish on to aerobic agar and McConkey plates—no growth after 48 hours.
		2. Total counts—(aerobic) no growth in 1 c.c. of mixtures.
		3. B. Coli Communis absent in 50 c.c. of mixture.
		4. Streptococci and Staphylococci present in 10 c.c. of mixture.
		5. B. Welchi type and B. Subtilis type present in 10 c.c. of mixture (anaerobic cultures).
		Commentary—Bacteriologically the tin contents are fit for human consumption.
„ 21	Canned Fish (Octopus)	1. Direct platings on to agar and McConkey were made :—					None. None.
		(a) From the oil			No growth
		(b) From the central parts of the fish.			in 48 hrs.
		2. An emulsion of chopped fish in sterile water was made for total counts, B.C.C., Streptococci and B. Welchi. All cultures remained sterile after 48 hours.
		Commentary—The contents of the tin were sterile in aerobic and anaerobic cultures.
Sept. 29	Canned Crab	Opened asceptically—no blowing ; contents quite wholesome and good. Bacterial count on agar, 510 per c.c.
		For presence of B. Coli—
		50 c.c.		No change or growth.
		20 c.c.		„		„
		10 c.c		„		„
		5 c.c		„		„
		1 c.c		„		„
		0.1 c.c.		„		„
		For presence of B. Welchi—
		20 c.c				Negative.
		10 c.c.				„
		Commentary—Contents appear fit for human consumption.
Nov. 8	Tinned Brislings	On opening—no gas. Contents quite wholesome— smell, good.					None.
		Bacterial count on agar—864 perc.c.
		For presence of B. Coli:—
		50 c.c.	No change or growth.
		20 c.c.
		10 c.c.
		5 c.c.
		0.1 c.c.
		0.01 c.c.
		0.001 c.c.
		Surface plates—A gram positive coccus and sarcinse some streptococci present (non-hsemolytic type). B. Coli and organisms absent. Anaerobic cultures, broth, bile salts, Mc. cankus and agar—no growth in four days.
		Bats.—Two rats, each received three feeds extending over three days. Bats alive and well after eight days, no signs of illness over this period. In my opinion the contents of this tin are satisfactory, and fit for human consumption.
(b) Jan. 1	Analyst— Sild (4)	These samples on analysis gave the following results:—					None.
		Sample No.				Tin, Grains per pound
		l				0.62
		2				0.75
		8				0.38
		4				0.29