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The Bacille Calmette–Guérin (BCG) vaccine has been in use for over 80 years. It is one of the most widely administered vaccines worldwide, and is included in national childhood immunisation programmes.
In countries like India, which is at high risk of tuberculosis (TB), medical practitioners recommend the BCG vaccine for children at birth.
The BCG vaccine helps a child’s immune system fight against the germs that cause TB and prevents them from getting serious complications.
This blog explores BCG full form in medical, along with its importance, administration, side-effects and after-care.
What is BCG Vaccine Full Form in Medical?
The full form of BCG vaccine is Bacillus Calmette-Guérin.
BCG is named after its French developers, Albert Calmette and Camille Guérin, who developed it to combat TB more effectively.
Understanding the BCG full form in medical is important for students, parents, and healthcare aspirants because of its relevance in medical exams and nursing practices.
What is BCG Vaccine?
BCG is a vaccine that is currently used to prevent TB, a critical bacterial disease that attacks the lungs and other organs, including the lymph nodes, bones, joints, and kidneys.
The BCG vaccine consists of a weakened form of Mycobacterium bovis, a relative of the bacterium that causes TB but does not cause the disease itself.
Additionally, BCG can also be used to treat bladder cancer, where it is used to stimulate the immune system to attack cancer cells.
How is BCG Vaccine Administered?
BCG vaccine is usually given once at birth or during infancy as part of routine immunisation programmes. The vaccine is administered as an injection into the skin of the upper arm.
In cancer treatment, BCG is delivered directly into the bladder using a thin catheter through the urethra. The treatment is usually given once a week for several weeks, followed by maintenance doses if needed.
Who Should Not Get BCG Vaccine?
The vaccine is not suitable for everyone. BCG should not be administered to:
- People with low immune systems, such as individuals living with HIV
- Pregnant women or those who have skin conditions at the injection site
- Individuals undergoing chemotherapy
Before administering the vaccine, healthcare providers should critically evaluate the risks and benefits.
Duration of BCG Vaccine
The BCG vaccine does not provide complete or permanent protection, although it reduces the risk of severe tuberculosis, particularly in young children.
Its immunity is expected to last approximately 10 to 15 years, but its efficacy can decrease over time.
Common Side Effects of BCG Vaccine
Common side effects include:
| Side Effects |
BCG Vaccine (for TB) |
BCG Therapy (for Bladder Cancer) |
| Common |
- Mild fever
- Redness or swelling at the injection site
- Small ulcer leading to a scar
|
- Frequent urination
- Burning during urination
- Mild fever
- Fatigue
- Blood in urine
|
| Moderate |
- Swollen lymph nodes
- Local abscess
|
- Bladder irritation
- Flu-like symptoms
- Persistent urinary discomfort
|
| Rare / Serious |
- Allergic reactions
- Widespread BCG infection (very rare)
|
- High fever
- Severe infection
- Lung/systemic infection
- Sepsis (very rare)
|
When to Seek Medical Help?
You must call your doctor or seek medical help if your child:
- Is under 3 months and has a temperature of 38°C or above
- Is over 3 months and has a temperature of 39°C or above
- Has a persistent high fever 48 hours after vaccination
- Develops severe swelling or rash
- Experiences wheezing, difficulty in breathing or swallowing
- Shows unusual symptoms beyond expected mild reactions
Importance of BCG Vaccine
BCG vaccine has several benefits to offer in order to treat people with blood cancer or to prevent children from getting TB. The potential benefits are as follows:
| Aspect |
Details |
| Role in TB prevention |
The BCG vaccine is a key tool in preventing tuberculosis (TB), especially in regions where the disease is widespread. It significantly reduces the risk of severe TB in children. |
| Immune response |
It stimulates the immune system to recognise and fight TB bacteria, lowering the chances of developing active TB. |
| Protection beyond TB |
The vaccine may also offer some protection against infections caused by non-tuberculous mycobacteria and severe forms of tuberculosis, such as TB meningitis, though the extent of this protection varies. |
| Advances with rBCG |
Recombinant BCG (rBCG) strains are being developed to enhance immune responses and target diseases such as leprosy, malaria, and certain viral infections. |
| Use in cancer treatment |
BCG is used to treat people with certain cancers, such as bladder cancer, where it activates the immune system to attack cancer cells. |
| Potential future applications |
Research is also examining its potential role in areas such as HIV vaccine development and the management of autoimmune conditions like type 1 diabetes. However, findings are still inconclusive. |
How to Look After the Vaccination Site?
Parents should follow the steps given below to care for the vaccination site:
- Keep the vaccination site dry and clean
- If a sore develops, cover it with gauze to allow air circulation
- Avoid squeezing or scratching the area
- Do not use ointments, oils or herbs on the area
- Do not cover the area with an adhesive bandage
- Do not rub or massage the site
Final Thoughts
The BCG vaccine remains a cornerstone in preventive healthcare to combat tuberculosis and support global public health efforts.
From its long-standing use to its evolving applications in areas like cancer therapy and advanced research, BCG highlights how microbiological innovations can transform disease prevention and treatment.
If you are inspired by the idea that microorganisms can be used to save lives, you can consider a career in Microbiology.
A course in Microbiology will allow you to work on developing vaccines, infectious diseases, and other groundbreaking medical discoveries that will define the future of healthcare.
FAQs
Q1: What age is BCG Vaccine given?
A1: The BCG Vaccine is usually given at birth or shortly after, as part of routine immunisation. In some cases, it may be administered up to 5 years of age if missed earlier.
Q2: What is BCG Treatment used for?
A2: BCG is primarily used to prevent tuberculosis (TB). It is also used in the treatment of bladder cancer, where it helps stimulate the immune system to attack cancer cells.
Q3: Why is BCG given at birth?
A3: BCG is given at birth to provide early protection against severe forms of TB in infants. Early vaccination helps reduce the risk of serious complications like TB meningitis.
Q4: How does BCG Vaccine work?
A4: The vaccine contains a weakened strain of Mycobacterium bovis that triggers the immune system. This helps the body recognise and fight TB bacteria effectively.
Q5: Why do we need BCG Vaccine?
A5: The BCG Vaccine helps prevent severe TB, especially in children, and reduces TB-related deaths. It is especially important in countries where TB is common.
Q6: Why is BCG given in the left arm?
A6: BCG is given in the left arm for standardisation and easy identification of the vaccination scar. This helps healthcare providers quickly verify if a person has been vaccinated.
