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Author Topic: Risk factors of tuberculosis (TB)  (Read 468 times)

Description: ”M. tuberculosis” complex includes four other TB-causing mycobacteria: ”M. bovis”, ”M. africanum”, ”M. canetti” and ”M. microti”. ”M. africanum”


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Risk factors of tuberculosis (TB)
« on: November 03, 2016, 14:51:21 PM »
Risk Factors
« Last Edit: November 08, 2016, 16:35:19 PM by auntiebiotic »


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Re: Risk factors of tuberculosis (TB)
« Reply #1 on: November 10, 2016, 15:46:01 PM »

Some people develop TB disease soon after becoming infected (within weeks) before their immune system can fight the TB bacteria. Other people may get sick years later, when their immune system becomes weak for another reason.

Overall, about 5 to 10% of infected persons who do not receive treatment for latent TB infection will develop TB disease at some time in their lives. For persons whose immune systems are weak, especially those with HIV infection, the risk of developing TB disease is much higher than for persons with normal immune systems.

Generally, persons at high risk for developing TB disease fall into two categories:

    Persons who have been recently infected with TB bacteria
    Persons with medical conditions that weaken the immune system

Persons who have been Recently Infected with TB Bacteria

This includes:

    Close contacts of a person with infectious TB disease
    Persons who have immigrated from areas of the world with high rates of TB
    Children less than 5 years of age who have a positive TB test
    Groups with high rates of TB transmission, such as homeless persons, injection drug users, and persons with HIV infection
    Persons who work or reside with people who are at high risk for TB in facilities or institutions such as hospitals, homeless shelters, correctional facilities, nursing homes, and residential homes for those with HIV

Persons with Medical Conditions that Weaken the Immune SystemPrinted with kind permission of CDC


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