When instructing the parents of a child who has received immunization in the vastus lateralis, which reaction is most common in the days after the administration?

a. Nausea, vomiting, and diarrhea

b. Rash and edema

c. Weakness and difficulty walking

d. Tenderness and redness at the site

The correct answer is d. Tenderness and redness at the site

Explanation:

Immunization is the process by which unharmful antigens (vaccine) are administered in a person's body so that the person develops memory against that antigen and become immune to that antigen.

After immunization antigen-antibody reactions start in the body which can give symptoms like redness in leg or arm where the vaccine was administered, swelling in the vaccinated area, soreness or tenderness in the vaccinated region, and pain.

Out of this tenderness and redness at the site is the most common reaction in days after administration.

The correct answer will be option-D

Explanation:

Vastus lateralis or anterolateral thigh is the muscle of the thigh which is the largest and the most powerful muscle in the thigh. The vastus lateralis is recommended as a site for intramuscular injection in infants.

A vaccine or immunoglobulin in infants must be given either in deltoid or the vastus lateralis muscle. When the injection is given in the vastus laterlis, after post-vaccination a temporary pain with tenderness and redness is observed at the site.

Thus, Option-D is the correct answer.