210 MODERN BIOLOGIC THERAPEUSIS 



"A" and paratypliosus "B" were first de- 

 scribed and studied by Acliard and Bensaude. 

 It is now conceded that about 3 per cent of the 

 cases of so-called clinical typhoid fever are due 

 to paratyphoid bacilli. According to the stud- 

 ies of the Johns Hopkins Hospital, 2 per cent of 

 apparent typhoid cases were paratyphoid, while 

 in Schottmuller's study of 69 cases of apparent 

 typhoid fever, 4 per cent were paratyphoid. 

 Conrade, in a study of 250 cases supposed to be 

 typhoid fever, found 29 to be paratyphoid fever. 

 According to Jordan, type "B" paratyphoid 

 bacillus is probably more widely distributed 

 and is present in a majority of cases of paraty- 

 phoid fever. Proescher and Roddy, however, 

 regard infection with paratyphoid "A" as 

 more common in America, and Hoskins has re- 

 ported an epidemic of 35 cases due to this bacil- 

 lus. Most authors regard the type "B" as the 

 most common cause of paratyphoid fever. 



In many instances, infection has seemed to 

 follow the ingestion of infected meat, especially 

 pork. As a matter of fact, any article of food 

 may contain the paratyphoid bacilli such as ice 

 cream, confectionery, oysters, public water sup- 

 plies and milk. The type of infection produced 



