Video: How the body reacts to tuberculosis
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(Médecins Sans Frontières/Doctors Without Borders, UK, 2014)
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(Médecins Sans Frontières/Doctors Without Borders, UK, 2014)
Most people who are infected with the TB bacteria don't have symptoms of infection, because the bacteria are not active. This is called latent (or sleeping) TB.
One in 10 people who have latent TB may develop active TB at some time in their lives. The risk of developing active disease is greatest in the first year after infection, but active disease often doesn't occur until many years later.
A person with latent TB infection can't spread the bacteria to other people. You don't need to be tested if you have spent time with someone with latent TB infection. However, if you have spent time with someone with TB disease or someone with symptoms of TB, you should be tested.
A Mantoux skin test is used to identify people with latent TB – people who may be infected with TB bacteria but don't have active disease. You will be asked to have a Mantoux skin test if you are at increased risk of exposure to TB. Read more about the Mantoux skin test.
Not all people with latent TB are treated. Only people at high risk of developing active TB disease are treated, such as people who have recently been exposed to TB disease, people with certain ongoing medical conditions or people taking certain medications that weaken their immune system.
Treatment for latent TB is antibiotics taken for 3–12 months. Treatment is effective in reducing your future risk of developing TB disease.
TB is spread through coughing, sneezing or spitting. The bacteria are carried into the air and people nearby can breathe them in through their mouths and noses.
TB can stay inactive your body for many years before it develops. This is called latent tuberculosis infection. Even though you feel well and healthy, if you have latent TB your doctor may still advise treatment to make sure you don't develop TB disease.
The following people are at greatest risk of getting TB:
You cannot get TB from clothes, drinking glasses, eating utensils, toilets or other surfaces where a person with TB has been, or from shaking hands with them.
Symptoms of TB depend on which part of your body is affected. Tuberculosis of your lungs is by far the most common type.
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If you have been around someone who has TB, you should go to your doctor for tests. To start with, you will usually have a chest x-ray, followed by phlegm (sputum) tests. A chest x-ray usually shows any active lung TB.
If the chest x-ray suggests that TB is possible, the next test is to look for TB bacteria from your lung. This is done by sending samples of sputum to the laboratory.
TB is curable. However, the bugs that cause TB are strong and it can take a long time for them to die.
Active TB (when there are symptoms) is treated with a combination of antibiotics for at least 6 months. A combination is used to prevent the bacteria becoming resistant. Examples of antibiotics used to treat TB include isoniazid, rifampicin, ethambutol and pyrazinamide.
If you have TB, here are a few things you can do to take care of yourself and protect your family/whānau and friends.
Taking your medicine and finishing all of it is the best way to protect yourself and others from TB. When you stop treatment early or miss doses, TB bacteria have a chance to develop mutations (changes) that allow them to survive despite you taking TB medicine. These drug-resistant strains are much more difficult to treat.
As well as taking your medicine, you can help your body fight the infection by eating healthy foods, getting enough sleep and exercise. Many people lose weight because of the infection. If you are losing too much weight, eat balanced meals with enough protein and calories to help you keep weight on.
People often feel embarrassed about having TB and worry that other people will find out about it. It's also easy to feel isolated and alone because you can't go to work, school or public places until you can no longer infect other people. If you are feeling depressed or have a low mood, tell your doctor or call or text 1737(external link) to talk to a counsellor for free any time day or night.
It usually takes a few weeks of treatment before you're not infectious (able to spread TB to other people). In the first 3–4 weeks, you can reduce the spread of infection by:
If you have latent TB (no symptoms), your doctor may advise you to take medicine to reduce your chance of getting active TB. By preventing latent TB from becoming active, you also won't spread TB to anyone else.
The BCG (Bacillus Calmette-Guérin) vaccine helps protect against severe forms of TB by helping your immune system fight against it. In New Zealand, the BCG vaccine is not recommended for the general population because the rates of TB are quite low in many parts of the country.
BCG vaccination is recommended for babies or children under 5 years of age if they have a higher risk of getting TB. Read more about the BCG vaccine.
Tuberculosis (TB) HealthEd, NZ English(external link), Russian(external link), Ukraine(external link)
Tuberculosis(external link) Immunisation Advisory Centre, NZ
Tuberculosis disease(external link) Health New Zealand | Te Whatu Ora
Tuberculosis (TB)(external link) National Public Health Service – Northern Region
Tuberculosis(external link) NHS, UK
Resources from other organisations that give you more information on tuberculosis, including in other languages.
Tuberculosis factsheet – Information about TB, including symptoms and treatmentHealth Ed, NZ, 2022 English(external link), Russian(external link), Ukraine(external link)
BCG vaccine – information for parents(external link) HealthEd, NZ, 2023 English(external link), te reo Māori(external link), Tongan(external link), Amharic(external link), Arabic(external link), Burmese(external link), Cambodian-Khmer(external link), Chinese (simplified)(external link), Chinese (traditional)(external link), Fijian(external link), Hindi(external link), Japanese(external link), Persian (Farsi)(external link), Pushto(external link), Somali(external link), more languages(external link)
BCG vaccine – aftercare for parents(external link) Health Ed, NZ, 2009 English(external link), Te reo Māori(external link), Tongan(external link), Amharic(external link), Arabic(external link), Burmese(external link), Chinese traditional(external link), Chinese simplified(external link), Fijian(external link), Japanese(external link), Hindi(external link), Khmer (Cambodian)(external link), Persian (Farsi)(external link), Pushto(external link), Somali(external link), Vietnamese(external link), more languages(external link)
Note: These resources are from overseas so some details may be different in New Zealand, eg, phone 111 for emergencies or, if it’s not an emergency, freephone Healthline 0800 611 116.
Tuberculosis factsheet(external link) NSW Multicultural Health Communication Service, Australia, 2005 English(external link), Samoan(external link), Tongan(external link), Chinese (traditional)(external link), Farsi(external link), Thai(external link), Vietnamese(external link)
Tuberculin skin test(external link) NSW Multicultural Health Communication Service, Australia, 2005 English(external link), Samoan(external link), Tongan(external link), Chinese (traditional)(external link), Farsi(external link), Thai(external link), Vietnamese(external link)
What you should know about tuberculosis (TB)(external link)Association of Asian Pacific Community Health Organizations, 1995 English(external link), Chinese(external link), Ilocano(external link), Korean(external link), Tagalog(external link), Thai(external link), Vietnamese(external link)
Association of Asian Pacific Community Health Organizations (AAPCHO), 1995
Chinese, English, Ilocano, Korean, Tagalog, Thai, VietnameseHealthEd, NZ, 2023
English, Maori, Tongan, Amharic, Arabic, Burmese, Cambodian-Khmer, Chinese (simplified), Chinese (traditional), Fijian, Hindi, Japanese, Kiribati (Gilbertese), Korean, Persian (Farsi), Pushto, Somali, Tuvaluan, Vietnamese, more languagesCredits: Healthify editorial team. Healthify is brought to you by Health Navigator Charitable Trust.
Reviewed by: Dr Helen Kenealy, Geriatrician and General Physician, Counties Manukau DHB
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