HIV infection represents a risk factor for hypersensitivity reactions to antimicrobial drugs. We report the first case of delayed, cell-mediated, allergy to isoniazid in a 57-year-old HIV-infected patient, who developed a maculo-papular exhantema after 10-day treatment with isoniazid etambutol, pyrazinamide and rifabutin. Pacht test resulted positive for isoniazid. Graded challenges with the ot...

INTRODUCTION: This study aimed to evaluate a new commercial kit, Kit SIRE Nitratase-PlastLabor, for testing the drug susceptibility of clinical Mycobacterium tuberculosis isolates. METHODS: The accuracy of the Kit SIRE Nitratase was evaluated by examining the susceptibility (streptomycin, isoniazid, rifampicin, and ethambutol) of 40 M. tuberculosis isolates, using the proportion method with L...

Methods: Two different capsule formulations of these drugs were prepared. Formulation-I contains immediate release uncoated pellets of Rifampicin and Isoniazid. Formulation-IIcontains immediate release pellets of Rifampicin and enteric coated pellets of Isoniazid. These pellets were evaluated for various physicochemical parameters. Enteric coating was mainly done to prevent the release of Isoni...

Biofilm growth of Mycobacterium smegmatis was found to be unaffected at an isoniazid concentration that inhibited growth of planktonic bacilli (i.e. at isoniazid minimum inhibitory concentration=10 microg ml(-1)). Significant growth (50% of drug-free control) of biofilms was observed at up to 40 microg ml(-1) and the MIC for biofilm growth showed an increase to up to 80 microg ml(-1) isoniazid....

sam (1956). Peizer and Widelock (1955), however, failed to find a consistent relationship between isoniazid sensitivity and catalase activity. Since the catalase test is easily performed and gives an immediate result, it would obviously be of value as a presumptive indicator of isoniazid resistance if it were proved to be consistently negative in isoniazid-resistant cultures. In order to obtain...

A 45-year-old black woman, sputum positive for acid-fast bacilli, developed hypersensitivity to both isoniazid and rifampin. She was admitted to the hospital and desensitized to both medications using modified penicillin protocols. Skin testing was negative to both drugs. Desensitization to isoniazid was complicated by a drug fever that was controlled by prednisone. The patient was able to main...

Eight cases of pellagra, diagnosed on the grounds of neuropathological findings and retrospective study of clinical data, were found among 106 necropsy cases of tuberculosis. Although these eight patients had shown various mental, neurological and gastrointestinal symptoms, as well as skin lesions, the diagnosis of pellagra had not been made clinically. In all the patients, pellagra symptoms ap...

Based on a new electrogenerated chemiluminescence (ECL) analytical idea, this paper explains a sensitive and selective flow-injection ECL method using luminol for the determination of isoniazid, based on the sensitizing effect of isoniazid for the weak ECL emission of electrochemically oxidized luminol. Under the optimum experimental conditions, the relative ECL intensity was linear with isonia...