February, '21] 



sturtevant: mixed infections 



129 



of the six samples were found in Stanislaus County in the same locality 

 as the sample reported by McCray in 1916. These cases were all found 

 in regions where both diseases are exceedingly prevalent and of long 

 standing. A few of the samples were fairly self evident from gross 

 appearances, but the majority required a more minute examination. 



From that time on, particularly after returning to the laboratory in 

 Washington, more careful examination was made, both gross and 

 microscopic of all samples received because of suspicions aroused by 

 the unusual prevalence of the obvious cases found in California. This 

 was done in order to eliminate the danger of overlooking cases where one 

 disease might be predominant over the other, whether both diseases 

 were suspected or not, causing the less prominent to be overlooked. 



As a result, during the remainder of the year 1919 from June until 

 December, twelve more such samples were received in the laboratory 

 from various parts of the country, (18 in all for that year, total 24) all of 

 which proved upon careful diagnosis to contain both American foul- 

 brood and European foulbrood in the same sample of comb. Further- 

 more, during the year 1920, up until November 15th, fourteen more 

 such samples were received, making a total in all of 38. Tables 1 and 2 

 give the data from sample records. 



Table I. — Cases of Mixed Infection from Laboratory Records 



