A top Russian medical expert on Friday did not rule out that the deadly virus, which causes atypical pneumonia or Severe Acute Respiratory Syndrome (SARS) could be a biological weapon developed by China. According to the member of Russian Medical Sciences Academy, Prof. Sergei Kolesnikov, SARS virus is a hybrid of two viruses, which can only be produced in laboratory conditions, TVS network reported. rosia jinn no kennkai