This is of course a rare case and should be treated by modern medicine as was tried first.

Abstract
Infective endocarditis is a deadly disease, associated with high mortality and morbidity. We present a case of a 14-year-old boy with antibiotic-resistant infective endocarditis who was treated with classical homeopathy. The case is analyzed according to the general reactivity of the organism and the Levels of Health theory.

https://journals.sagepub.com/doi/10.1177/11795476231158517