Published ahead of print on August 13, 2003, doi:10.1164/rccm.200305-682OC
Am. J. Respir. Crit. Care Med., Volume 168, Number 11, December 2003, 1342-1345
A more recent version of this article appeared on December 1, 2003
Submitted on June 25, 2003
Accepted on August 11, 2003
The bactericidal activity of moxifloxacin in patients with pulmonary tuberculosis
Stephen H Gillespie1*, Roly D Gosling1, Leonard O Uiso2, Noel E Sam3, Emily Bongard1, Esther G Kanduma4, Mramba Nyindo3, and Richard W Morris5
1 Medical Microbiology, University College London Medical Schools, London, United Kingdom,
2 Kibong'oto National Tuberculosis and Leprosy Hospital, Sanya Juu, Tanzania, United Republic of,
3 Clinical Laboratory, Kilimanjaro Christian Medical College, Moshi, Tanzania, United Republic of,
4 Clinical Laboratory, Kilimanjaro Christian Medical College, Moshi, Tanzania, United Republic of; Medical Microbiology, University College London Medical Schools, London, United Kingdom,
5 Primary Care and Population Sciences, University College London Medical Schools, London, United Kingdom
* To whom correspondence should be addressed. E-mail: stepheng{at}rfc.ucl.ac.uk.
Patients with newly diagnosed AFB smear-positive pulmonary tuberculosis were randomised to receive 400mg moxifloxacin, 300mg isonaizid, or 600mg rifampin daily for 5 days. Sixteen hour overnight sputa collections were made for the 2 days before and for five days of monotherapy. Bactericidal activity was estimated by the time taken to kill 50% of viable bacilli (vt50) and the fall in sputum viable count during the first 2 days designated as the Early Bactericidal Activity (EBA). The mean vt50 of moxifloxacin, was 0.88 days (95% CI 0.43- 1.33 days) and the mean EBA 0.53 (95% CI 0.28- 0.79). For the isoniazid group the mean vt50 was 0.46 days (95% CI 0.31- 0.61 days) and mean EBA was 0.77 (95% CI 0.54- 1.00). For rifampin the mean vt50 was 0.71 days (95% CI 0.48 - 0.95 days ) and mean EBA was 0.28 (95% CI 0.15-0.41). Using the EBA method isoniazid was significantly more active than rifampin (p<0.01) but not moxifloxacin. Using the vt50 method isonizid was more active than both rifampin and moxifloxacin (p=0.03). Moxifloxacin has an activity similar to rifampin in human subjects with pulmonary tuberculosis suggesting that it should undergo further assessment as part of a short course regimen for the treatment of drug susceptible tuberculosis.
Key words: Clinical trials, Africa, tuberculosis, quinolone
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