FOOD-POISONING 



H7 



" The results of these experiments are given in the following 

 table : 



Tx*\BLE i6. Shozvijig the results of experiments witJi 

 B. enteritidis {Gaertner). 



Plates from 



Time after infection 

 24 hours 



Intestinal 

 contents 



Faeces 



Flies allowed to 

 walk over plates 



3 days 



4 

 5 

 6 



17) 

 15) 



9) 

 12) 



o (3) 

 o + (7) 



o + (5) 



o + (5) 



+ (6) 

 + (4) 

 + (3) 

 o (6) 



+ indicates that B. enteritidis was isolated and proved by cultures on suitable 

 media, including sugars ; o that the suspicious colonies isolated did not turn out to be 

 B. eiitej-itidis and - that no cultures were made. Some of the plates were completely 

 overgrown with colon-like organisms. The figures in brackets indicate the number of 

 flies used in each experiment. 



" On the 7th day six flies (I — VI, Table 17) were captured and 

 killed. The legs and wings were removed with sterile forceps 

 and plated separately. After flaming, the bodies were dissected 

 and the crops and intestines isolated, separate cultures being 

 made from the contents of each. The head was also removed 

 and separately cultivated. On the 8th day five flies (VII — XI) 

 were treated in the same way. The results of these experiments 

 are given in the following table : 



TABLE 17. Shozving the results of further experiments 

 with B. enteritidis. 



Cultures from 



No. of 

 fly 



I 



II 

 III 



IV 

 V 

 VI 



VII 



VIII 



IX 



X 



XI 



Legs 



Wings 



- \ 



Flies dissected 

 on the 7th day 

 after infection 



Flies dissected 

 on the 8th day 

 after infection 



+ + indicates that numerous colonies of B. enteritidis were found. 



