Published online by Cambridge University Press: 23 December 2009
The HIV/AIDS epidemic has led to a resurgence in the rates of tuberculosis in the developed world. In the developing world, co-infection with HIV and tuberculosis is extremely common and a major cause of morbidity and mortality. Tuberculosis in HIV-infected children can be more severe than disease in HIV-uninfected children, and treatment is complicated by drug–drug interactions between antiretrovirals and tuberculosis medications. Nevertheless, effective treatment of tuberculosis in the HIV-infected child is critically important for prolonged survival, even in the absence of antiretroviral therapy.
Epidemiology
Mycobacterium tuberculosis is the etiologic agent of tuberculosis. Humans are the only reservoir for the organism. In the USA the number of cases of tuberculosis has been declining, but the global burden of disease is staggering. World Health Organization (WHO) data for 1997 estimated almost 8 million new cases that year, 16.2 million existing cases, 1.87 million deaths attributable to tuberculosis, and global prevalence of infection of 32% [1]. WHO estimates that the worldwide prevalence of tuberculosis and HIV co-infection is 0.18%, with 8% of new cases of tuberculosis occurring in patients who are HIV seropositive. This rate of HIV seropositivity among incident tuberculosis cases is as high as 65% in some African nations.
In an adult, a case of tuberculosis can result from either reactivation of endogenous latent infection or exogenous primary infection or reinfection [2].
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