Patient's question:
The vaccination was administered on January 11th. Yesterday, I only discovered that a pustule had formed. There were none before. It's normal for this pustule to take over two months to appear?Doctor's answer:
Generally, newborns who receive the BCG vaccine on the second day after birth can develop effective immunity within 2 to 3 months.The local reaction after receiving the BCG vaccine is different from other vaccines. Most children will experience a local reaction again 3 to 4 weeks (for initial vaccination) or 1 to 2 weeks (for revaccination) after receiving the BCG vaccine. This process involves redness, swelling, purulent formation, ulceration, and scab formation, and typically scabs fall off around 3 months, leaving a scar. This is a normal reaction to the BCG vaccine and indicates that it has been effectively administered. If this reaction does not occur again, it may suggest successful vaccination, and (booster vaccination) should be considered.
To determine if the BCG vaccine was successful, a tuberculin (OT) test is usually performed 8 to 14 weeks after vaccination at the local tuberculosis prevention and control center. A local reaction of redness and swelling of 0.5 to 1.0 cm in diameter is considered normal.
The above advice addresses the question, "Is it normal for the BCG vaccine to show a reaction only after 2 months?" and is hoped to be helpful to you. Wishing you good health!