When should the BCG vaccine be administered?

Sep 13, 2022 Source: Cainiu Health

Dr. Jiang Weimin

Introduction

If there are no special circumstances (such as asphyxia, premature birth, low birth weight, organ malformations, acute infectious diseases, immune deficiency, skin disorders, etc.), the BCG vaccine can be administered within 24 hours after an infant's birth. The BCG vaccine is the first immunization given to infants after birth and primarily prevents tuberculosis infection. Vaccination can be carried out on the first day following birth.

The Bacillus Calmette-Guérin (BCG) vaccine is primarily used to prevent tuberculosis. So, when should the BCG vaccine be administered?

When Should the BCG Vaccine Be Given?

If there are no special circumstances (such as asphyxia, premature birth, low birth weight, organ malformations, acute infectious diseases, immune deficiencies, skin disorders, etc.), newborn infants can receive the BCG vaccine within 24 hours after birth. The BCG vaccine is the first immunization shot given to infants after birth and mainly helps prevent tuberculosis infection. Vaccination can be carried out on the first day after an infant's birth. After receiving the BCG vaccine, it is important to monitor the injection site for symptoms such as pus discharge or blistering—these reactions are normal. However, if redness, swelling, or fever occurs in the infant, further medical evaluation is needed.

There is only one type of BCG vaccine, which is a live bacterial vaccine made from a suspension of attenuated bovine strain Mycobacterium tuberculosis. Its active ingredient consists of live attenuated Mycobacterium bovis (BCG bacteria). The BCG vaccine provides partial protection against tuberculosis infection. After vaccination, the body develops specific immunity against Mycobacterium tuberculosis, inhibiting the bacterium’s replication and spread within the body, thus helping to prevent tuberculous meningitis and miliary tuberculosis.

Individuals with acute illnesses, severe inflammation, chronic diseases, acute exacerbation of chronic conditions, or fever, those with immune deficiencies, compromised immunity, or currently receiving immunosuppressive therapy, patients with uncontrolled brain disorders such as epilepsy and other progressive neurological diseases, pregnant women, and individuals with eczema or other skin diseases should not receive the BCG vaccine. We hope this article has been helpful to you. Wishing you good health and happiness!

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Contraindications for BCG vaccination in newborns

Newborns should avoid receiving the BCG vaccine if they are allergic to the vaccine components, have immunodeficiency or impaired immune function, are undergoing immunotherapy, or suffer from acute or chronic diseases or are in an active phase of illness. Additionally, BCG vaccination should be avoided in newborns with neurological disorders, eczema, or a birth weight less than 2500g, to prevent potential adverse reactions.

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What does the newborn BCG vaccine prevent?

The BCG vaccine for newborns is primarily used to prevent tuberculosis. Newborns have poor immune function, and administering the BCG vaccine within 24 to 48 hours after birth helps stimulate the body to produce antibodies, enhancing resistance against tuberculosis. However, immediate vaccination after birth is not recommended for preterm infants weighing less than 2.5 kg, or those with pathological jaundice, neonatal pneumonia, neonatal sepsis, or similar conditions.

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What disease does the BCG vaccine prevent?

Under normal circumstances, the BCG vaccine is a live attenuated vaccine used to prevent tuberculosis. Common diseases it helps prevent include primary pulmonary tuberculosis, miliary tuberculosis, tuberculous meningitis, tuberculous pleurisy, and osteotuberculosis. It is important to note that the BCG vaccine does not completely prevent primary infection with Mycobacterium tuberculosis; however, it can effectively protect infants and young children against tuberculous meningitis and disseminated tuberculosis infections.

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Is it a problem if I haven't received the BCG vaccine by age 24?

It's generally not a problem if the BCG vaccine hasn't been administered by age 24. The BCG vaccine is a live bacterial vaccine that can enhance the ability of macrophages to kill tumor cells and strengthen the body's cellular immune function. It is usually recommended to receive the BCG vaccine within 24 hours after birth. At age 24, an individual is an adult with a relatively mature and robust immune system; therefore, not having received the BCG vaccine is typically not a significant concern.

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Can you get tuberculosis after receiving the BCG vaccine?

Tuberculosis infection can still occur after BCG vaccination. Following BCG vaccination, individuals are protected against severe forms of tuberculosis—such as miliary tuberculosis and tuberculous meningitis—and experience reduced incidence and mortality rates for these conditions. However, vaccination only induces the production of certain antibodies in individuals with a normally functioning immune system, conferring partial immunity against the disease.

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When should newborns receive the BCG vaccine?

When newborns meet the vaccination criteria, the BCG vaccine should be administered within 24 hours of birth; if the criteria are not met, vaccination should be delayed. Full-term healthy newborns weighing more than 2.5 kg should receive the BCG vaccine within 24 hours of birth. For preterm infants or those with a birth weight less than 2.5 kg, BCG vaccination should be postponed until the infant's weight exceeds 2.5 kg or until they are in stable health condition.

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How many doses of the BCG vaccine does a newborn receive?

The BCG vaccine for newborns generally requires only a single dose. The BCG vaccine is a live bacterial vaccine made from a suspension of attenuated bovine tuberculosis bacilli, which can stimulate the body to produce corresponding macrophages and sensitized lymphocytes. When the body is exposed to tuberculosis bacteria, it can rapidly trigger a specific immune response to protect against infection. Newborns can receive the BCG vaccine within 24 hours after birth.

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Can you still get tuberculosis after receiving the BCG vaccine?

Even after receiving the BCG vaccine, individuals may still develop tuberculosis. This is because the protective effect of the BCG vaccine gradually wanes over time. The BCG vaccine provides effective protection for approximately 5–6 years, and its protective effect is generally considered to disappear entirely after about 10 years. Consequently, individuals beyond this protective age window essentially lose the vaccine’s preventive benefit against tuberculosis.

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