The concern of the medical personnel is that Jamie is more likely to develop subacute bacterial endocarditis.
Bacterial endocarditis is a bacterial infection of the inner layers of the heart which affects mostly the heart valves leading to abnormal functioning of the valves.
A subacute bacterial endocarditis occurs with a gradual onset of symptoms such as
Because Jamie had suffered from rheumatic fever, which caused some major damage to one of her heart valves, any procedure that would introduce bacteria to her blood is highly avoided.
That was why she was told to avoid getting body piercings and taking antibiotics before performing any dental procedures.
Learn more about bacterial infections here:
https://brainly.com/question/26298859