A snakebite victim is given antivenom, not a vaccine. Why?
A vaccine works by getting the body to make its own antibodies and memory cells, which takes days to weeks.
A vaccine works by getting the body to make its own antibodies and memory cells, which takes days to weeks. Snake venom can kill within hours, so there is no time to build active immunity. Antivenom is preformed antibodies -- passive immunity -- that neutralise the venom immediately. It gives instant but short-lived protection, exactly what an emergency needs, whereas a vaccine is for building protection in advance.
Key point
Antivenom supplies ready-made antibodies (passive immunity) for instant action, since a vaccine's active immunity would develop far too slowly.
Common mistake
thinking a vaccine could act quickly enough against venom.
Memory tip
emergency now -> passive (ready antibodies); prevention later -> active (vaccine).
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