Yhv is a nodavirus tentatively yellow head, Named yhv virus that causes muscle necrosis in yhv was found in belize in 2004, And proved susceptible to other shrimp families. Exhibited clinical signs, White, Opaque lesions in the tails and histopathology similar to those of shrimps infected by infectious myonecrosis virus yhv . However, Yhv was not detected in these shrimps by either rt, Pcr or in situ hybridization, Suggesting that these lesions may be caused by another rna virus which is yhv infection. The samples were positive for shows positively, Yhv infection reacting tissues included, Connective tissues skeletal muscle, The lymphoid organ, And hemocytes in the heart and gills. So, Detection of yhv nod virus is shrimps are certain and decisive