A type of white blood cell that plays an important and integral role in the body’s defenses. There are two main classes of lymphocytes, namely B lymphocytes (humoral immunity) and T lymphocytes (cell – mediated immunity).

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International Union of Immunological SocietiesUniversity of South AfricaInstitute of Infectious Disease and Molecular MedicineElizabeth Glazer Pediatric Aids FoundationStellenbosch University