Browsing 1 Published Research and Commentary by Subjects
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Antimicrobial susceptibility of Neisseria gonorrheae strains in three regions of ArmeniaOBJECTIVE: There are no data available on gonococcal susceptibility in the Caucasus region. We aimed to determine in vitro antimicrobial susceptibility of Neisseria gonorrheae in Armenia in order to update the national treatment protocol. METHODS: Isolates from men with urethral discharge presenting at 3 STI clinics in 3 different sites of Armenia were used to determine susceptibility of N. gonorrheae strains for 11 antimicrobials using the disc diffusion technique. RESULTS: Among the 101 isolates tested the susceptibility rate for penicillin, doxycycline, and kanamycin were 37.6, 25.7, and 80.2%, respectively. Sensitivity to quinolones was 95% for both ofloxacin and ciprofloxacin. All strains were susceptible to third-generation cephalosporins and to spectinomycin. Only 11% of strains were susceptible to all antibiotics tested. CONCLUSION: Third-generation cephalosporines and spectinomycin are suitable first-line regimens. Quinolones are not advisable as first-line treatment given current borderline susceptibility, known tendency for rapid resistance development in this class, and frequent over-the-counter use of this antibiotic in Armenia.
Cost-effectiveness of management strategies for acute urethritis in the developing world.OBJECTIVE: To recommend a cost-effective approach for the management of acute male urethritis in the developing world, based on the findings of a theoretical study. METHODS: A model was developed to assess the cost-effectiveness of three urethritis management strategies in a theoretical cohort of 1000 men with urethral syndrome. (1) All patients were treated with cefixime and doxycycline for gonococcal urethritis (GU) and nongonococcal urethritis (NGU), respectively, as recommended by WHO. (2) All patients were treated with doxycycline for NGU; treatment with cefixime was based on the result of direct microscopy of a urethral smear. (3) All patients were treated with cotrimoxazole or kanamycin for GU and doxycycline for NGU. Cefixime was kept for patients not responding to the first GU treatment. Strategy costs included consultations, laboratory diagnosis (where applicable) and drugs. The outcome was the rate of patients cured of urethritis. Cost-effectiveness was measured in terms of cost per cured urethritis. RESULTS: Strategy costs in our model depended largely on drug costs. The first strategy was confirmed as the most effective but also the most expensive approach. Cefixime should cost no more than US$ 1.5 for the strategy to be the most cost-effective. The second strategy saved money and drugs but proved a valuable alternative only when laboratory performance was optimal. The third strategy with cotrimoxazole was the least expensive but a low follow-up visit rate, poor treatment compliance or lower drug efficacy limited effectiveness. Maximizing compliance by replacing cotrimoxazole with single-dose kanamycin had the single greatest impact on the effectiveness of the third strategy. CONCLUSION: Our model suggested that a cost-effective approach would be to treat gonorrhoea with a single-dose antibiotic selected from locally available products that cost no more than US$ 1.5.
Thin-layer agar for detection of resistance to rifampicin, ofloxacin and kanamycin in Mycobacterium tuberculosis isolatesBACKGROUND: In low-income countries there is a great need for economical methods for testing the susceptibility of Mycobacterium tuberculosis to antibiotics. OBJECTIVE: To evaluate the thin-layer agar (TLA) for rapid detection of resistance to rifampicin (RMP), ofloxacin (OFX) and kanamycin (KM) in M. tuberculosis clinical isolates and to determine the sensitivity, specificity and time to positivity compared to the gold standard method. METHODS: One hundred and forty-seven clinical isolates of M. tuberculosis were studied. For the TLA method, a quadrant Petri plate containing 7H11 agar with RMP, OFX and KM was used. Results were compared to the Bactec MGIT960 for RMP and the proportion method for OFX and KM. RESULTS: The sensitivity and specificity for RMP and OFX were 100% and for KM they were 100% and 98.7%, respectively. The use of a TLA quadrant plate enables the rapid detection of resistance to the three anti-tuberculosis drugs RMP, OFX and KM in a median of 10 days. CONCLUSION: TLA was an accurate method for the detection of resistance in the three drugs studied. This faster method is simple to perform, providing an alternative method when more sophisticated techniques are not available in low-resource settings.