Tonsillitis is an infection of the tonsils, which are part of the body's lymphatic system and are found in the back of the throat. When someone has tonsillitis, it can make them feel very sick, with symptoms including sore throat, headache, fever, and swollen lymph nodes in the neck. Tonsillitis is usually caused by a viral or bacterial infection.

Step 1: Understand the question
The question is asking how long someone should take antibiotics for tonsillitis before they are no longer contagious.

Step 2: Analyze the medical information
Antibiotics are medications used to treat bacterial infections. When someone has tonsillitis, the bacteria causing the infection should be treated with antibiotics to prevent further spread.

Step 3: Determine the time it takes for the person to be no longer contagious
To determine how long a person with tonsillitis should take antibiotics, we need to understand the time it takes for the body to clear the infection. Antibiotics work by killing or stopping the growth of bacteria, and they usually start working within a few hours of being taken. However, it takes time for the body to clear the infection, and the length of time depends on various factors, such as the type of bacteria causing the infection, the person's immune system, and the effectiveness of the antibiotics.

Step 4: Provide a detailed answer
Based on the above information, it is not possible to give an exact number of days for how long someone should take antibiotics for tonsillitis before they are no longer contagious. However, in general, it is recommended that someone with tonsillitis takes antibiotics until they feel better and the symptoms have cleared, which may be anywhere from a few days to a week or longer. It is important to follow the doctor's instructions and finish the entire course of antibiotics prescribed, even if the symptoms have gone away before then.

In summary, the length of time someone with tonsillitis should take antibiotics before they are no longer contagious is not a precise number of days. It varies based on individual factors and the effectiveness of the antibiotics prescribed. It is important to follow the doctor's instructions and finish the entire course of antibiotics.