its in there Non-polio enteroviruses
Causes
Non-polio enteroviruses are the most common cause of viral meningitis in the United States, especially from late spring to fall when these viruses spread most often. However, only a small number of people who get infected with enteroviruses will actually develop meningitis.
What's a enterovirus?
Enteroviruses are a group of viruses that include the polioviruses (viruses that cause polio)source