Antigens for cellular immunity testing: Cellular immunity (CI) plays a dominant role in host control of herpesvirus infection. Its impairment may result in the development of chronic recurrent forms of the infections with poor prognosis for the patient. Virus-specific cellular immunity examination is important especially in the patients treated with immunosuppressive therapy (transplant recipients, oncological or autoimmune disease patients). It is beneficial also for vaccination or immunotherapy planning and efficiency monitoring. Native antigens HSV-1, HSV-2 – CI nativ r.t.u. are intended for virus specific T-lymphocytes stimulation in tests of adoptive cellular immunity. The antigens r.t.u. are lyophilized in working concentration of the lymphocyte cultivation medium. After dissolving in the appropriate volume of sterile distilled water they can be directly mixed 1:1 with blood or the lymphocyte suspension and then cultivated.