
doi: 10.1007/bf02601727
Comparative double immunodiffusion techniques were used to study capsular and O antigenic relationships betweenHaemophilus influenzae types a-fandH. pleuropneumoniae types 1–5 and a strain (202) closely related toH. pleuropneumoniae. Culture fluids or culture supernatants were used as antigens and rabbit antisera were produced against cell suspensions of the strains tested. A reaction of identity was obtained between the capsular precipitate ofH. influenzae c and a precipitate formed by strain 202, when developed with anti-H. influenzae c serum or the serum produced against strain 202. Mutual cross-absorption of capsular antibodies was also demonstrable. No other capsular or O antigenic cross-reactivity was demonstrable between the strains tested.
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