![]() ![]() This is because TB infection can take some time to develop, and a negative TB test may not be accurate if the infection is in its early stages. If a person has been exposed to TB or is at high risk of TB infection, it is recommended to repeat the TB skin test after a few weeks. This indicates that the person has not been infected with TB or that the infection is not active. The area around the injection site will be smooth and without any redness or swelling. What Does a Negative TB Test Picture Look Like?Ī negative TB test picture will show no reaction to the TB skin test. It could mean that the person has not been infected with TB, or that the infection is not active. However, it is important to understand that a negative TB test does not always mean that a person is free from TB infection. Negative TB test pictures can be confusing because they do not show any reaction to the TB skin test. Section 2: Interpreting Negative TB Test Pictures It is important to inform your healthcare provider if you have any of these factors that can affect the accuracy of the TB skin test results. Other medical conditions, such as HIV/AIDS.Several factors can affect the accuracy of the TB skin test results, including: Factors That Can Affect the TB Skin Test Results The size of the reaction is measured in millimeters and is used to determine the likelihood of TB infection. When the tuberculin is injected into the skin, it triggers an immune response that causes the area to become red and swollen if the person has been infected with TB. The TB skin test works by detecting the presence of antibodies in the body that have been produced in response to the TB bacterium. However, if there is no reaction, it means that the person has not been infected with TB or that the infection is not active. ![]() This indicates that the immune system has responded to the bacterium and is trying to fight it off. If the person has been infected with TB, the area around the injection site will become red and swollen. A small amount of tuberculin is injected into the skin on the forearm, and the area is checked for a reaction after 48-72 hours. Patients taking active immunosuppressive therapy (e.g.The TB skin test is a simple and inexpensive way to check for TB infection. Patients known to have HIV, diabetes mellitus, gastrectomy or jejunoileal bypass, low body weight (< 90% of ideal body weight), silicosis, chronic renal failure, leukemia, or cancer of the head, neck, or lungs † Infants, children, and adolescents exposed to adults who are known to have latent TB infection or TB disease * Health care workers who have been exposed to a patient with known TB disease * ![]() Consultation with a TB expert is necessary if there is suspicion or confirmation of drug-resistant TB.Įmployees of, or residents who live or have lived in, congregate settings (e.g., homeless shelters, correctional facilities, nursing homes) * Treatment of drug-susceptible TB disease includes an eight-week intensive phase with four drugs (isoniazid, rifampin, pyrazinamide, and ethambutol), followed by a continuation phase lasting 18 weeks or more, with two drugs based on susceptibility testing results. Preferred treatment regimens for LTBI include isoniazid in combination with rifapentine or rifampin, or rifampin alone for a duration of three and four months, respectively. Both suspected and confirmed cases of LTBI and TB disease must be reported to local or state health departments. After a positive test result, chest radiography should be performed and, in patients with suspected pulmonary TB disease, sputum collected for diagnosis. Because the incidence of LTBI in health care professionals is similar to that of the general population, periodic retesting is not recommended. Preventive Services Task Force recommends testing individuals at increased risk of LTBI with an interferon-gamma release assay or tuberculin skin testing. Individuals with symptoms of TB disease warrant testing. Without treatment, LTBI will progress to active TB disease in approximately 5% to 10% of affected people. In the United States that same year, there were nearly 9,000 reported cases of TB disease and up to 13 million people were living with latent TB infection (LTBI), which is an asymptomatic, noncommunicable infection caused by Mycobacterium tuberculosis. Approximately 10 million people worldwide were infected with tuberculosis (TB) in 2019, resulting in 1.4 million deaths. ![]()
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