Influenza
Influenza is an acute viral infectious disease with a droplet transmission mechanism of the pathogen, characterized by an abrupt onset, fever, general intoxication, and damage to the respiratory tract.
The causative agent is an RNA-containing virus of the orthomyxovirus family, influenza virus genus. Based on antigenic characteristics, three serological types of the pathogen are distinguished - A, B, and C. Depending on the features of surface proteins hemagglutinin (H) and neuraminidase (N), influenza virus type A causing disease in humans is divided into three subtypes, which are denoted as A(H1N1), A(H2N2), and A(H3N2). Since 1977, diseases in people have been caused by the subtypes A(H1N1) and A(H3N2)
Source: Order of the Chief State Sanitary Doctor of Russia dated April 30, 2003 No. 82 (as amended on June 10, 2003) "On introducing into force sanitary-epidemiological rules SP 3.1.2.1319-03" (together with "SP 3.1.2.1319-03. 3.1. Prevention of infectious diseases. Prevention of influenza. Sanitary-epidemiological rules", approved by the Chief State Sanitary Doctor of Russia on April 24, 2003) (Registered by the Ministry of Justice of Russia on May 20, 2003 No. 4578)