Serological types of Diplococcus pneumoniae isolated from the respiratory tract of children with cystic fibrosis and children with other diseases.

The distribution of serological types of D. pneumoniae was investigated in 40 
strains isolated from 26 children with cystic fibrosis and 57 strains 
isolated from 39 children with other diseases. All strains were isolated 
from sputum or tracheal secretion. The strains from cystic fibrosis patients 
belonged to 14 different serological types, the most prevalent were 19F, 
19A and 3. The strains from the other group of children 
belonged to 20 different serological types, the most prevalent were 23F, 
19F and 11A. The differences between the two groups of patients 
as to the prevalences of types were small, and it is 
concluded that no special serological types of D. pneumoniae are associated 
with cystic fibrosis. 