Studying the monkeys after exposure, researchers uncovered the websites of transmission and an instant spread of the virus to encircling lymphoid tissues. Sites of an infection included soft cells in the mouth Likely, esophagus and tonsils. Related StoriesNew vaccine candidate shows great promise at fighting respiratory syncytial virusMillions even more bird species killed by West Nile virus than previously thoughtStudy provides novel insight in to the development of hepatitis A virus and how it spreads to humansFurther study of the digestive system showed that SIV was not present in tissues below the esophagus until four days post-infection, indicating that the stomach acids most likely avoided the virus from entering through the abdomen or intestines. ‘It is very clear from our research that the oral and esophageal mucosa and the tonsils are likely to be the most crucial sites of viral entry,’ Dr.The procedure involved adapting quantitative strategies that had been useful for studying morphological development of animals previously, but never put on the enigmatic Ediacara organisms. But species may be very similar within their overall body plan. However, a couple of three species offering a fly just, a frog and an earthworm represent a lot more morphological variation. We are able to thus think about biodiversity not only with regards to just how many different species you can find but also just how many fundamentally specific body plans are getting represented.