Final answer:
The path by which a drug enters the body is known as the route of administration. For home administration of an antimicrobial to treat a systemic infection, an appropriate and convenient route would be oral.
Step-by-step explanation:
The path by which a drug enters the body is known as the route of administration. The route of administration refers to the method used to introduce a drug into the body. For home administration of an antimicrobial to treat a systemic infection, an appropriate and convenient route would be oral, as it allows patients to take the medication at home.