Answer:
Vaccination involves showing the immune system something which looks very similar to a particular virus or bacteria, which helps the immune system be stronger when it is fighting against the real infection.
Explanation: "it is what it is".
The most possible explanation to the client's condition is a reaction to the anti-epileptic medications that he/she is taking.
Diffused redness and large blisters on the buccal mucosa could be symptoms of stomatitis, an inflammation of the mucous membranes of the mouth and lips. Stomatitis could be an indication of mouth irritation caused by a reaction to certain drugs, such as antibiotics and epilepsy medications.
