89 



Conclusions. 



(1) During the four years 1918-1921 influenza bacilli have 

 been found in the normal nasopharynx in over 30 per cent, of the 

 persons I have examined. 



(2) During 1920-1921 influenza bacilli have been found in the 

 sputum or lung«in about 60 per cent, of cases of lobar pneumonia, 

 in 88 per cent, of cases of simple broncho-pneumonia and 

 bronchitis and, during the epidemic of January 1922, in 65 per 

 cent, of cases of influenza and influenzal pneumonia. 



(3) Agglutination tests with specific monovalent rabbit sera 

 have revealed great diversity in serological type. An attempt at 

 partial classification has shown that certain antigenic characters 

 occur in a proportion of the strains from all these different sources. 



(4) There is no satisfactory evidence of special serological 

 types being associated with disease nor with epidemic prevalence 

 of influenza. 



(5) The serological diversity of influenza bacilli cannot be 

 used as an argument either in favour of or against their etiological 

 relationship to influenza. 



Printed under the authority of His Majesty's Stationery Office 



Bv Eyre and Spottiswoode, Ltd., East Harding Street, E.C 4, 



Printers to the King's most Excellent Majesty. 



