Primary drug resistance among pulmonary treatment-naïve tuberculosis patients in Amazonas State, Brazil.


BACKGROUND Multidrug-resistant tuberculosis (MDR-TB) is the main indicator of previous treatment in tuberculosis (TB) patients. MDR-TB among treatment-naïve patients indicates infection with drug-resistant Mycobacterium tuberculosis strains, and such cases are considered primary drug-resistant cases. OBJECTIVE To estimate the prevalence of drug resistance in pulmonary TB (PTB) treatment-naïve patients and to identify the socio-demographic and clinical characteristics of the resistant population. METHODS A total of 205 treatment-naïve PTB patients from Manaus, Amazonas State, Brazil, were enrolled. Drug susceptibility testing (DST) was performed on all positive mycobacterial cultures using the 1% proportion method. RESULTS Positive M. tuberculosis cultures were obtained from only 175 patients for DST. The prevalence of primary MDR-TB was 1.7% (3/175); 14.3% (25/175) of the cultures presented resistance to at least one of the drugs. Resistance to streptomycin, isoniazid, rifampicin and ethambutol was respectively 8.6%, 6.9%, 3.4% and 2.3%. An association between TB patients with resistance to more than one drug and known previous household contact with a TB patient was observed (P= 0.008, OR 6.7, 95%CI 1.2-67.3). CONCLUSIONS Although the prevalence of primary MDR-TB currently is relatively low, it may become a major public health problem if tailored treatment is not provided, as resistance to more than one drug is significantly associated with household contact.

DOI: 10.5588/ijtld.13.0191

Cite this paper

@article{Garrido2014PrimaryDR, title={Primary drug resistance among pulmonary treatment-na{\"{i}ve tuberculosis patients in Amazonas State, Brazil.}, author={Marlucia da Silva Garrido and Rajendranath Ramasawmy and Tomas Maria Perez-Porcuna and Etelvina das Graças Zaranza and A Chrusciak Talhari and Flor Ernestina Mart{\'i}nez-Espinosa and Samira B{\"{u}hrer-S{\'e}kula}, journal={The international journal of tuberculosis and lung disease : the official journal of the International Union against Tuberculosis and Lung Disease}, year={2014}, volume={18 5}, pages={559-63} }