There are many people who care for Victor when he is stricken with a fever.
First, his friends and family care for him. They bring him food and water and make sure that he is comfortable. They also help him get better by reminding him to eat and drink, taking him outside to walk around, and bringing him books to read while he recovers from his illness.
Second, the doctor who treats him cares for him by making sure that Victor is healthy again. The doctor gives him medicine and follows up with regular visits to see how Victor is doing. He also gives Victor advice about how to stay healthy in the future.
Third, the nurses who care for him in the hospital care for him by making sure he gets plenty of rest so that his body can heal itself naturally without any help from drugs or machines other than those that monitor his vitals such as heart rate, blood pressure, etcetera). They also administer medication as directed by doctors or at least according to guidelines established by their employers (such as hospitals or nursing homes) who have policies regarding treatment protocols established through research conducted over many years (including evidence-based findings).