TCFA Feedyard Technician Certification Practice Test

What causes an injection site lesion?

1. Scar tissue from irritation at the injection site

2. Excessive movement during injection

3. Improper dosage of the vaccine

4. Lack of veterinarian supervision

The correct answer is: Scar tissue from irritation at the injection site

An injection site lesion is primarily caused by scar tissue formation from irritation at the injection site. When an injection is administered, whether it be a vaccine or medication, it can lead to localized inflammation and tissue damage. This irritation prompts the body’s healing response and, as a result, fibrous scar tissue is laid down in the area as it repairs itself. Over time, this scar tissue can create a visible lesion or bump at the site of the injection, which is often noticeable during follow-up examinations or vaccinations. Injections that are given improperly can contribute to this issue, but the fundamental cause remains the body's reaction to the injection itself and the subsequent repair process that creates scar tissue. Understanding this helps in implementing best practices for injections to minimize irritation and subsequent lesions, which can affect animal welfare and the efficacy of future treatments or vaccinations.