Enteroviruses cause common infections with various clinical course and forms, such as hand-foot-and-mouth disease (Boston exanthem disease), herpangina, myocarditis and pericarditis, widespread myositis (epidemic pleurodynia, Bornholm disease), or aseptic inflammation of the nervous system, among children and adolescents. An increase in aseptic meningitis cases of enteroviral aetiology, including the E30 virus, was occasionally observed in various European countries. In 2014, an outbreak of aseptic meningitis was reported in Podlaskie Voivodeship. A total of 640 cases were reported between June 1 and November 30, 2014, of which 228 had confirmed enteroviral aetiology. Summer and autumn seasons favour the incidence of viral infections of the central nervous system. Symptomatic infections are more common in males than females. Infections with enterovirus show the tendency to form endemic regions.