The following Rat Assessment Plus serology results received between October 2020 and May 2021 have been collected to demonstrate the prevalence of viruses within our community. These results are from 21 different breeders spanning 11 different states. We hope that by seeing “you are not the only one“, we can come together as a community to help stop the spread of life threatening viruses and relieve the stigma of positive results. Remember: for some viruses, a positive serology result does not necessarily show an active infection in a colony but the presence of antibodies. With the exception of zoonotic viruses, we, along with Charles River Laboratories believe that as long as there are no symptoms in your colony, a positive for antibodies means you have rats with healthy immune systems, able to fight infection without intervention.