86 



Distribution in Pneumonia, due. 

 Table 6 shows the extent to which the three antigens selected 

 for grouping occur among the strains isolated from the common 

 inflammations of the respiratory apparatus. In the pneumonias 

 about a third of all the strains contain either none or only in- 

 significant amounts of these antigens. The few strains from 

 simple bronchitis on the other hand all fall into groups. 



Table 7. 

 Distribution of the commoner Antigens among Strains isolated from 

 the normal Nasopharynx. 



Distribution in the normal Nasopharynx. 



The first series of 60 strains includes 45 of those already re- 

 ferred to (vide Table 2) as having been obtained from out- 

 patients at St. Bartholomew's Hospital and Lambeth Infirmary 

 in 1918, 1919 and 1920, the remainder being miscellaneous from 

 staff, etc. The small series of contacts represent the 6 strains 

 isolated from 25 boys at a Public School in which a mild outbreak 

 of influenza was in progress, while the series from school children 

 in Westminster is comparable with the latter series in that the 

 swabs were taken at the height of the epidemic of January, 1922. 



The first series is interesting as showing a high proportion of 

 " individual " strains, 58 per cent, as compared with 32 per cent, 

 among strains from lobar pneumonia and still lower percentages 

 among the other categories. The point of interest in the other 

 two sets is the high proportion of the group I strains in both. 

 Here there is certainly some indication that a particular antigen 

 may be characteristic of epidemic strains of the influenza bacillus. 



Table 8. 



Distribution of the commoner Antigens among Strains isolated 



from Cases of Influenza. 



