It also causes fat cells to multiply and can lead to massive weight gain. ???This virus goes to the lungs and spreads through the body,??? said Nikhil Dhurandhar, an associate professor at the Pennington Biomedical Research Center in Baton Rouge, Louisiana. ???It goes to various organs and tissues such as the liver, kidney, brain and fat tissue,??? Dhurandhar told BBC2???s ???Horizon??? program. ?