What could cause someone to have a high lymphocyte blood count and sometimes run a low-grade fever at night?
This is a difficult question to answer. Any type of infection can caue the above symptoms. Anything from mononucleosis, malaria, lymphoma, strep, etc. the list is virtually endless. A GOOD history and physical exam by an experienced doctor will help him start to figure out which tests to order. It can be a lenghty process, since it is a process of elimination.
Which lymphoid organ provides a site for lymphocyte proliferation and immune surveillance and response and provides blood-cleansing functions?
The term "lymphocyte" can be translated to "white blood cell"--lymphocytes are just one of a few different types of white blood cells in the body. The normal lymphocyte count for an adult is between 1000 and 4800 cells per microliter; lymphocytopenia is a lymphocyte count lower than the norm. Lymphocytes are important to the human immune system, so a low lymphocyte count may mean you're more vulnerable to infection or other problems.