Madison Clarke
Tuberculosis (TB) is a severe lung infection caused by bacteria. The Bacille Calmette-Guérin (BCG) vaccine is a vaccine for TB disease that is injected into the skin. It is on the World Health Organization's List of Essential Medicines and is given to about 100 million children per year globally. However, the BCG vaccine is not commonly administered in the United States due to the rarity of tuberculosis in the country. Instead, the US relies on the detection and treatment of latent tuberculosis through regular skin tests and antibiotics. While the BCG vaccine is not generally used in the US, it may be considered for people who meet specific criteria, such as children living with someone actively infected with TB who cannot take antibiotics or are infected with a drug-resistant strain.
| Characteristics | Values |
|---|---|
| Name of the vaccine | Bacille Calmette-Guérin (BCG) |
| Use in the US | Not generally used |
| Use in other countries | Commonly used in countries where TB is common |
| Protection | Protects children from getting severe forms of active TB disease |
| Protection duration | Weakens over time |
| Testing | TB blood tests are preferred over TB skin tests for people who have received the BCG vaccine |
| Side effects | Redness, swelling, mild pain, small ulcer, scarring |
| Use cases | Recommended for children living with someone with TB who cannot take antibiotics or is infected with a strain resistant to antibiotics |
| TB cases in the US | 6,646 cases reported in 2024 |
| TB cases among children in the US | 68 cases reported in 2023 |
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What You'll Learn
The BCG vaccine is not routinely used in the US
The Bacille Calmette-Guérin (BCG) vaccine is a vaccine for tuberculosis (TB) disease. It is not routinely used in the US. The vaccine is not generally used in the US because of the rarity of tuberculosis in the country. Instead, the US relies on the detection and treatment of latent tuberculosis. Cases of TB do occur in the US each year, but most are diagnosed in people not born in the country. In 2018, there were fewer than 10,000 cases of TB and fewer than 500 deaths caused by TB in the US.
The BCG vaccine is recommended by the World Health Organization (WHO) for settings with a high incidence of TB. The vaccine is given to about 100 million children per year globally, but it is not commonly administered in the US. The BCG vaccine is only considered for people who meet specific criteria and in consultation with a TB expert. For example, the vaccine is recommended for children living with someone who is actively infected with TB and cannot take antibiotics or is infected with a drug-resistant strain.
The TB vaccine is good at protecting against severe forms of TB found in young children, such as TB meningitis. However, it is not as effective at protecting against lung infections commonly found in adolescents and adults. The vaccine's protection also weakens over time. The BCG vaccine can cause a false positive TB skin test reaction, so TB blood tests are preferred for people who have received the vaccine. While the BCG vaccine has been around since the early 1920s, new vaccines with greater efficacy against adult pulmonary TB may be needed to make substantial progress.
The US is one of only two countries that have never routinely used the TB vaccine, the other being the Netherlands. The low incidence of TB in the US is likely due to better control of HIV with the use of anti-retroviral drugs. However, the rate of decline in TB cases is slow, and predictions suggest that tuberculosis will not be eliminated from the US during this century. While the BCG vaccine is not routinely used in the US, it is still an important tool in the fight against TB in other parts of the world.
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TB is rare in the US
Tuberculosis (TB) is a contagious disease caused by the bacterium Mycobacterium tuberculosis. It generally affects the lungs but can also impact other parts of the body. While TB was historically a significant health concern in the United States, it has become less prevalent over time. In recent years, TB cases in the US have been relatively rare compared to other parts of the world.
The introduction of pasteurized milk has almost eliminated Mycobacterium bovis, which was once a common cause of human TB in developed countries. Additionally, improvements in sanitation and the introduction of drug treatments, including antibiotics, have contributed to the decline in TB cases in the US. However, it is important to note that TB has not been eradicated completely, and there are still annual cases reported.
The Bacille Calmette-Guérin (BCG) vaccine is a preventative measure against TB. While the BCG vaccine is commonly used in countries where TB is prevalent, it is not routinely administered in the US. The CDC states that the BCG vaccine is only considered for individuals in the US who meet specific criteria and in consultation with a TB expert. This is because the vaccine's protection weakens over time and can cause false-positive results on TB skin tests.
The majority of individuals infected with TB exhibit no symptoms, a condition known as inactive or latent TB. Latent TB is not contagious, and individuals with latent TB do not require treatment. However, without treatment, an estimated 5% to 15% of latent TB cases can progress to active TB during the person's lifetime. Active TB disease is highly contagious and can spread through respiratory droplets when a person with active TB coughs, speaks, or sneezes.
The symptoms of active TB disease in the lungs may include a chronic cough with bloody mucus, chest pain, fever, night sweats, and weight loss. If TB infects other organs, symptoms may vary depending on the affected site. Treatment for active TB requires multiple antibiotics and can take several months. Successful completion of treatment is crucial to curing the disease and minimizing its spread to others.
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TB skin tests are used to detect the disease
The Bacille Calmette-Guérin (BCG) vaccine is a vaccine for tuberculosis (TB) disease. It is not generally used in the United States, except for people who meet specific criteria. However, it is common in countries where TB is prevalent and is given to infants and young children to protect them from severe forms of active TB, such as TB meningitis.
TB skin tests are used to detect TB infection and are often used for children under five. The test involves injecting a purified protein derivative (PPD) solution, a protein from the Mycobacterium tuberculosis bacterium, under the skin. This is not a live bacterium and will not cause sickness. If there is a firm, red bump at the injection site within three days, it indicates a positive result, meaning the individual has been exposed to TB bacteria. However, it does not distinguish between latent (dormant) or active TB infection. A positive skin test indicates the presence of TB germs, and further tests, such as a chest X-ray and sputum test, are required to confirm active TB disease.
It is important to note that receiving a BCG vaccine can cause a false positive TB skin test. Therefore, individuals who have received the BCG vaccine are recommended to undergo a TB blood test, which is unaffected by the vaccine. TB blood tests, also known as Interferon-Gamma Release Assays (IGRA), are becoming more common, especially for healthcare workers and immunocompromised individuals.
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TB is one of the world's leading infectious diseases
Tuberculosis (TB) is a curable and preventable disease caused by bacteria that usually attack the lungs. It is spread from person to person through the air. While TB mostly affects adults in their most productive years, all age groups are at risk.
In the United States, the Bacille Calmette-Guérin (BCG) vaccine for TB is only considered for people who meet specific criteria and in consultation with a TB expert. This is because the vaccine is not generally used in the country. However, many people born outside the United States have been vaccinated with BCG, as it is given to infants and small children in countries where TB is prevalent.
There are significant challenges in the global fight against TB, such as underfunding, undernutrition, HIV infection, alcohol use disorders, smoking, and diabetes. Low- and middle-income countries bear 98% of the TB burden, with India, Indonesia, China, the Philippines, and Pakistan accounting for 56% of the global TB burden. The coverage of TB preventive treatment has been sustained for people living with HIV, and it continues to improve for household contacts of people diagnosed with TB. However, multidrug-resistant TB remains a public health crisis, with only 44% of the estimated 400,000 people with MDR/RR-TB diagnosed and treated in 2023.
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TB is treatable with antibiotics
Tuberculosis (TB) is a dangerous bacterial infection, but it is almost always curable. There are several treatment options available for TB, including various medications and antibiotics.
The Bacille Calmette-Guérin (BCG) vaccine is a vaccine for TB that is used in many countries outside the United States. The vaccine is typically given to infants and small children in countries where TB is prevalent. However, the BCG vaccine is not generally used in the US, except for people who meet specific criteria and in consultation with a TB expert. The vaccine can cause false positives on TB skin tests, so TB blood tests are preferred for those who have received the BCG vaccine.
For those who have been exposed to TB, there are several treatment options available. Directly Observed Therapy (DOT) is recommended for all patients, especially in the initial stages of treatment. This involves a medical professional watching the patient take their medication to ensure it is taken correctly and no doses are missed. Antibiotics are also a crucial part of TB treatment, with patients typically taking a combination of several antibiotics and other medications for 6 to 9 months. Isoniazid and rifapentine are two such antibiotics, which are taken once a week for 3 months under a doctor's supervision. Other antibiotics that may be prescribed include bedaquiline (Sirturo), ethionamide (Trecator), and para-aminosalicylic acid. In addition, pyridoxine can be used empirically if the ingested dose is unknown.
For pregnant patients with TB, preventive treatment is recommended, especially for those who are HIV-positive or at risk of HIV infection. Streptomycin is not used during pregnancy as it can harm the fetus. Instead, pyrazinamide is commonly used in pregnant individuals with TB.
Overall, while TB is a serious disease, it is treatable with antibiotics and other medications. Treatment options vary depending on the patient's specific circumstances, such as pregnancy or drug resistance, and should always be undertaken with medical supervision.
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Frequently asked questions
The TB vaccine is rarely used in the United States and is not recommended for the general public. It is only advised for children living with someone with TB who cannot take antibiotics or is infected with a strain resistant to antibiotics.
The TB vaccine is not routinely used in the US because of the rarity of tuberculosis in the country. The US relies on the detection and treatment of latent tuberculosis to stop its spread.
The TB vaccine is known as the Bacille Calmette-Guérin (BCG) vaccine. It is made by weakening a strain of bacteria, Mycobacterium bovis, similar to tuberculosis, which was first isolated in cows.
The efficacy of the TB vaccine varies in different countries. While it has shown a 60% to 80% protective effect in the UK, trials conducted elsewhere have shown no protective effect. The variable efficacy may be due to factors such as genetic differences in populations and changes in the environment.
