What diagnosis for fever for 17 day without any symptoms. CRP -ve, ESR 22&56. WBCs 3500, neutrophl 1000, lymphocytosis. LDH 468 no thrombocytopenia?

Mono? Obviously, you are in a workup by someone. Keep going. Mononucleosis has some of these characteristics, though "no symptoms" would be improbable given the blood results. The old addage: "common diseases occur commonly, rare diseases occur rarely" advocates that mono might be a good bet. But, that's only a statistical perspective.
Asked and answered. You have a fever of undetermined origin (FUO). The lab data you provided is not sufficient to warrant even a guess as to what may be going on. You need to see a doctor and have this fully evaluated, and the longer you try doing this on your own the worse it may get. Good luck.

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What diagnosis for fever for 17 day without any other symptoms. CRP -ve. ESR 22&56. WBCs 3500, neutrophil 1000, lymphocytosis. LDH 468?

Many possibilities. Need far more history and physical findings. This is called a fever of undetermined origin and in over 50% of cases is not due to infection. You should be seen by an infectious diseases expert and evaluated thoroughly. Do not neglect this further. You may need a bone marrow aspirate and biopsy as part of the assessment. Good luck and inshallah you should be better. Read more...