Final answer:
A 10- to 15-degree angle injection is used for an Intradermal (ID) injection which is utilized for allergy tests or tuberculosis skin tests. For home administration of an antimicrobial to treat systemic infection, the oral route is most suitable.
Step-by-step explanation:
The 10- to 15-degree angle injection is typically used with an Intradermal (ID) injection. Intradermal injections are administered into the dermal layer of the skin, and the small angle helps ensure that the medication is delivered correctly into the dermal layer rather than subcutaneously or into the muscle. This method is often used for allergy testing or tuberculosis skin tests.
Regarding the administration of antimicrobials for systemic infections, the oral route is often the most convenient and appropriate for home administration. It is a non-invasive method that is generally safe and easy for patients to administer on their own.