BCG

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Bacillus Calmette-Guerin (BCG) Vaccine - The Bacille Calmette-Guérin (BCG) vaccine primarily protects against tuberculosis (TB) Via: The BCG leaves a mark because it is not a "common and ordinary" vaccine. It is a LIVE vaccine that is applied in a specific way - https://x.com/notremadame/status/2058950561827885076 # It is a live attenuated bacterium. And since it is alive, when it enters the skin it does not die instantly. It stays generating a local infection. # It is injected intradermally, NOT intramuscularly. When injected in that way, a small nodule forms that at the moment turns into an ulcer that drains pus for weeks. That scar is basically fibrous tissue that remains after the body fights the attenuated bacterium and eliminates it. {tags: Vaccine}
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