medical-photo_web.jpgHealth care providers in the United States have a new way to treat latent tuberculosis infection, according to new recommendations released by the Centers for Disease Control and Prevention.

The recommendations, published in CDC’s Morbidity and Mortality Weekly Report, provide guidance on how to administer a new 12-dose regimen for TB preventive therapy that will significantly shorten and simplify the course of treatment from about nine months to 12 weeks.

The recommendations are based on the results of three clinical trials, as well as expert opinion, and follow results from the largest of those clinical trials, first announced in May 2011 and now published in the New England Journal of Medicine.

That multi-national clinical trial conducted by CDC’s TB Trials Consortium found that a once-weekly regimen of the anti-TB drugs rifapentine and isoniazid, taken as directly observed therapy over a period of three months, was as effective in preventing TB disease as the standard self-administered nine-month daily regimen of isoniazid alone, and was completed by more patients. The new regimen has a significant benefit over the previous standard of treatment by cutting the doses required from 270 daily doses to 12 once-weekly doses.

“This regimen has the potential to be a game-changer in the United States when it comes to fighting TB,” said CDC Director Thomas R. Frieden. “It gives us a new, effective option that will reduce by two-thirds — from nine months to three months — the length of time someone needs to take medicine to prevent latent TB infection from progressing to active TB disease.”

Latent TB infection occurs when a person has TB bacteria but does not have symptoms and cannot transmit the bacteria to others. If the bacteria become active, the person will develop TB disease, become sick and may spread the disease to others. Although not everyone with latent TB infection will develop TB disease, some people, such as those with weakened immune systems, are at higher risk of progression to TB disease. Many of those at high risk of developing TB disease never even begin the cumbersome nine-month course of standard treatment, and among those who do, many do not complete it.

In the United States, the number of persons with TB disease is at an all-time low (11,182 total cases were reported in 2010); however, approximately 4 percent of the U.S. population, or 11 million people, are infected with the TB bacterium. TB continues to disproportionately affect people of color and foreign-born persons in this country.

“If we are going to achieve our goal of TB elimination in the United States, we must ensure that those with latent TB infection receive appropriate evaluation and treatment to prevent their infection from progressing to TB disease and possibly spreading to others,” said Kevin Fenton, director of CDC’s National Center for HIV/AIDS, Viral Hepatitis, STD, and TB Prevention. “It is critical that we accelerate progress against TB in the United States in order to avoid a resurgence of the disease.”

CDC officials note that these recommendations are only for the United States.  Countries with a high incidence of TB, especially those with high HIV prevalence and where the risk of TB re-infection is greater, will likely require additional studies before considering whether to recommend this regimen.


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