Cowpea mosaic virus-infected plant (IMAGE) Dartmouth Health Caption Though it does not infect mammals, the Cowpea mosaic plant virus is recognized by and strongly stimulates the immune system to attack and often eliminate cancerous tumors. Credit UCSD Usage Restrictions With permission of UCSD License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.