List any two emergent circumstances, when a medical Dr. would recommend of an injection of a preformed antibody into the body of a patient and why?

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Preformed antibodies are derived from the blood serum of previously infected people or animals and then administered into another patient. They provide passive immunity. Two emergent situations when the doctor recommends an injection of preformed antibodies:

• Some deadly microbe to which quick immune response is required infects the patient. e.g. tetanus.
• During snake bites, antivenom injections are administered with preformed antibodies are administered.  

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