During the period from August 1997 to March 1998, two thousand samples of cultured Penaeus semisulcatus postlarvae and subadults were collected from five hatcheries and 20 growout farms distributed in three provinces along the costs of Persian Gulf and the Oman Sea. Based on growth signs, LM and TEM histopathology, Hepatopancreatic Parvo-like Virus (HPV) were identified from the samples. The HP...

The present electron microscopic study of a spontaneous mammary tumor (diagnosed histologically as adenocarcinoma) of collared lemming was undertaken in search for the possible presence of particles resembling oncogenic RNA virus particles. The study has demonstrated the presence of a large number of characteristic virus-like particles. The virus-like particles were similar to the ham ster type...