Before taking vitals, after catheterzation, before using a needle to take blood, before putting on gloves.
The answer is...
B. Buffers
The answer to this question is to instruct
the roommate to have a treatment with antimicrobial prophylaxis as soon as
possible.
Antimicrobial prophylaxis is a medical procedure
that is given to patients to prevent infection from spreading in the body. With
this case, the roommate is being exposed to a patient with <span>meningococcal meningitis
and this treatment is needed immediately. </span>