Final answer:
The DTaP vaccine is administered intramuscularly at a 90-degree angle to ensure the vaccine reaches the muscle tissue.
Step-by-step explanation:
The correct angle of insertion for administering the DTaP injection for a patient depends on whether the injection is intramuscular or subcutaneous. For intramuscular injections, the common practice is to use a 90-degree angle of insertion to ensure that the vaccine is delivered into the muscle tissue. The DTaP vaccine, which protects against diphtheria, tetanus, and pertussis, is typically administered intramuscularly. In this manner, a 90-degree angle would be appropriate for Mr. Lupez's DTaP injection.