SHISHIDO, H., TAKAHASHI, A., MATSUMOTO, K., SAKAI, A. and ISHIGURO, M.
Growth-Enhancing Effect of Branhamella catarrhalis Culture Filtrates on the L-Forms of Haemophilus influenzae. Tohoku J. exp. Med., 1986,
149 (3), 261-269 -
Haemophilus influenzae is a common respiratory pathogen and recurrent infection due to
H. influenzae is a phenomenon often present in patients with chronic respiratory tract infections. The effects of
Neisseria perflava and
B.
catarrhalis culture filtrates on the growth and reversion of
H. influenzae L-forms were determined using the L-forms of
H. influenzae induced and subcultured in a medium containing 10% sucrose and these culture filtrates. When each culture filtrate of two strains of
N. perflava was added, the viable count of revertants reached a peak of growth after 48hr and exceeded 10
4CFU/ml even 48 days after the subculture. Adding each culture filtrate of six strains of
B. catarrhalis, the viable count of revertants from the L-forms of
H. influenzae was much higher than that in the absence of any filtrate (negative control). The filtrate of a culture prepared from one of the six strains of
B. catarrhalis was subjected to biochemical analysis. The molecular weight of the growth-enhancing factor(s) was determined to be approximately 1, 000 to 5, 000. Some peptide fractions showed growth-enhancing effects on the L-forms of
H. influenzae. These findings suggest that culture filtrates may be important clues as to the correlation between recurrent infections due to
H. influenzae and the growth of L-forms in the sputum of the patients with chronic respiratory tract infections, during or after the administration of β-lactam antibiotics.
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