Researchers performing autopsies of H5N1 virus infected cats have found that the virus can be transmitted through urine and faeces thus intensifying fears of a human panendemic. Cats were initially thought as being immune to the virus. However, the research, quoted in magazine Nature, found that the pattern of this infection of these mammals, with similar body systems as humans, through a "fecal-oral route" indicates that the virus does not care which cell it attacks. A follow-up study published in the Journal of Pathology, showed that the virus attacked brain, liver, kidney, heart, and other tissues it comes in contact by killing cells and causes inflammation.