| outbreak of aseptic meningitis by echo 4: prevalence of clinical cases among adults. | twenty five cases of meningitis occurred in urban areas surrounding a city (modena) in northern italy, in the period may-july 1999. when the patients were admitted to the infectious diseases division of the university of modena and reggio emilia hospital and studied by virological and serological methods, the meningitis proved to have an enteroviral origin and enterovirus echo 4 type was responsible for all cases of illness. an epidemiological characteristic of the enteroviral meninigitis outbre ... | 2001 | 11209838 |