Novel Mycobacterium Species in Seahorses with Tail Rot

receive isoniazid if their TB developed when they were young. In the present study, the resistant rate was lower for M. tuberculosis strains isolated from elderly persons than from younger adults. These fi ndings suggest that fi rst-line anti-TB medications still have good in vitro activity against M. tuberculosis strains in elderly patients. In contrast to the study by Vinnard et al. (1), our results showed that isoniazid-resistant M. tuberculosis was signifi cantly less likely to be isolated from nonrespiratory than from respiratory specimens. The reasons for this fi nding are unclear. Continuous monitoring of antimicrobial drug resistance among M. tuberculosis isolates isolated from various body sites needs to be incorporated into any TB surveillance program. Gathering data on drug resistance rates is a major aspect of the global TB control program. Clinicians must have knowledge of local epidemiology, and mycobacteriology laboratories should maintain up-to-date information on drug susceptibility test profi les of local M. tuberculosis isolates.