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An alert and oriented 87-year-old female has fallen and suffered a 3-cm laceration to the back of her head. According to the patient, her walker became caught in the carpet, causing her to trip. When obtaining a medical history, which one of the following sources should be asked first?
Host
An organism that harbors another organism (parasite, mutualistic symbiont, or commensal) often providing nourishment and shelter.
Benefit
A positive outcome, advantage, or gain that is obtained or received, often as a result of an action, decision, or policy.
Parasitism
An interaction between species where one organism (the parasite) lives on or in another organism (the host), causing it harm.
Commensalism
A relationship between two living organisms where one benefits without harming or benefiting the other.
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