Can BCG vaccine prevent TB?
BCG vaccine has a documented protective effect against meningitis and disseminated TB in children. It does not prevent primary infection and, more importantly, does not prevent reactivation of latent pulmonary infection, the principal source of bacillary spread in the community.
Is BCG and TB vaccine the same?
The BCG vaccine protects against tuberculosis, which is also known as TB. TB is a serious infection that affects the lungs and sometimes other parts of the body, such as the brain (meningitis), bones, joints and kidneys.
How long does BCG vaccine protect against TB?
BCG vaccination given to babies and young children provides consistent protection (up to 80%) against severe forms of childhood TB, such as TB meningitis. It can be less effective against TB affecting the lungs in adults. The protection from the BCG vaccine can last up to 15 years.
Why did the TB vaccine leave a scar?
The vaccine requires multiple punctures giving multiple infection start sites, so it becomes very inflammatory – leaving behind the scar tissue. The TB vaccine is different, in that it is a single injection, but BCG is extremely immunogenic and causes severe local inflammation, which can cause a long-lasting scar.
Why does the TB vaccine leave a scar?
Why did scarring occur? Scars like the smallpox vaccine scar form due to the body’s natural healing process. When the skin is injured (like it is with the smallpox vaccine), the body rapidly responds to repair the tissue.
Why is BCG vaccine not effective for adults?
However, BCG is not generally recommended for use in the United States because of the low risk of infection with Mycobacterium tuberculosis, the variable effectiveness of the vaccine against adult pulmonary TB, and the vaccine’s potential interference with tuberculin skin test reactivity.
Do you need a BCG booster?
Do I need a booster? Protection has been shown to last for 10 to 15 years (WHO, 1999). Although the protection afforded by BCG vaccine may wane with time, there is no evidence that repeat vaccination offers significant additional protection and repeat BCG vaccination is not recommended.
Why does BCG leave a scar?
Why does TB jab leave a scar?
What immunizations were given in the 1970s?
References
| TABLE 1. Year of U.S. licensure of selected childhood vaccines | |
|---|---|
| Vaccine | Year of first US licensure |
| Diphtheria–tetanus–pertussis | 1970 |
| Diphtheria–tetanus–acellular pertussis | 1991 |
| Measles–mumps–rubella | 1963 (measles); 1967 (mumps); 1969 (rubella); 1971 (measles–mumps–rubella combined) |