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Strains of all subtypes of influenza A virus have been isolated from wild birds, although disease is uncommon. At the time, scientists had not yet discovered flu viruses, but we know today that the 1918 pandemic was caused by an influenza A (H1N1) virus. Influenza, or flu, is a virus that attacks the respiratory system. Influenza A virus causes influenza in birds and some mammals, and is the only species of the genus Alphainfluenzavirus of the virus family Orthomyxoviridae. In 1947, Jonas Salk, one of the vaccine's creators, began to develop a polio vaccine, which was perfected and approved in 1955. Some isolates of influenza A virus cause severe disease both in domestic poultry and, rarely, in humans. The 1918 influenza pandemic was the most devastating single disease outbreak in modern history, and examining the virus that caused it may help prepare for, … A quadrivalent inactivated influenza vaccine was licensed in the United States in 2012, and a quadrivalent live virus nasal spray vaccine was licensed in 2013. The influenza pandemic of 1918–19 resulted from such an occurrence and affected populations throughout the world. Before 1918, it had come and gone in cycles, a serious illness, especially for the elderly, but nowhere near as deadly as smallpox, yellow fever or cholera. The pandemic is commonly believed to have occurred in three waves. For example, penicillin was not discovered until 1928. (Influenza C causes upper respiratory tract infections in young people but is not as common as the other two types.) Influenza vaccines did not exist at the time, and even antibiotics had not been developed yet. The Italian word influenza derived from a Latin word for the influence of the stars on human affairs — a grim visitation beyond anyone’s control. Influenza is caused by a virus that is transmitted from person to person through airborne respiratory secretions. This led to the study of the virus’s characteristics and the development and use of inactivated vaccines in the late 1930s and 1940s. The protective efficacy of these inactivated vaccines was demonstrated in the 1950s. It is generally caused by one of two types of influenza virus: influenza A or influenza B. An outbreak can occur if a new strain of influenza virus emerges against which the population has no immunity. The need for a 2009 H1N1 influenza vaccine became apparent after the strains for the seasonal flu vaccine had already been selected, so that a separate vaccine was created. Also in 1936, Macfarlane Burnet discovered that influenza virus could be grown in embryonated hens’ eggs. The 2009 H1N1 outbreak was not nearly as deadly as the pandemic of 1918–19. Unusual flu-like activity was first identified in … Likewise, no flu antiviral drugs were available. The H1N1 virus that caused the outbreak was discovered to possess genetic material from human, avian, and two different swine influenza viruses. Officials investigating the outbreak quickly traced the illness to La Gloria, where a young boy, who later became known as “patient zero,” was discovered to be infected with a previously unknown strain of influenza virus. Influenza is an infectious disease commonly characterized by fever, muscles aches, sore throat, headache, and fatigue. The influenza virus was discovered in the early 1930s, and scientists developed a working vaccine by the 1940s, when it was first used on soldiers during World War II. Commonly characterized by fever, muscles aches, sore throat, headache, and two different swine influenza.. 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