Abstract:
:Antibiotic activity against common respiratory pathogens can be affected by the pH of the medium (in vitro) or the bodily fluid (in vivo) in which bacteria are present. The ionized fraction of an antibiotic is not able to efficiently penetrate bacterial or mammalian membranes, reducing the quantity of molecules able to exert their antibacterial effect resulting in elevated MIC values This study shows that the activity of macrolide antibiotics is particularly sensitive to acidic conditions, whereas a ketolide and fluoroquinolones are much less affected. Furthermore, induction of spontaneous and multistep macrolide resistance is greatly increased in acidic medium. In contrast, telithromycin and moxifloxacin did not induce resistance at any pH. Antibiotics which are less likely to induce resistance in vitro may also be less likely to induce the development of resistance in patients with respiratory tract infections.
journal_name
Infectionjournal_title
Infectionauthors
Dalhoff A,Schubert S,Ullmann Udoi
10.1007/s15010-005-8206-ykeywords:
subject
Has Abstractpub_date
2005-12-01 00:00:00pages
36-43eissn
0300-8126issn
1439-0973journal_volume
33 Suppl 2pub_type
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