38 SHELLFISH CONTAMINATION FROM SEWAGE-POLLUTED WATERS. 



in an Erlenmeyer flask was used for each of the tests on shucked 

 oysters, while about 3 dozen medium-sized oysters and hard 

 clams in the shell were laid on the shelves of the sterilizer for the 

 other experiments. The steamer was full of live steam when the 

 samples were introduced. Tables Nos. 12 to 15, inclusive, show the 

 results of these tests. 



TABLE 12. The destruction, by steaming, of bacteria in shucked oysters artificially infected 



with B. coli. 



These results show that all B. coli were destroyed during from 10 to 

 15 minutes' exposure to live steam. In the following experiment on 

 steaming shucked oysters, naturally infected, all B. coli types failed 

 to develop when exposed to live steam for from 5 to 10 minutes. 



TABLE 13. Bacteriological results showing effect of steaming shucked oysters naturally 



infected. 



TABLE 14. Bacteriological results showing the effect of steaming oysters in the shell. 



