What is the definition of a novel influenza virus?

Feb 10, 2025 ... What causes body aches? ... Viral infections, such as the flu, COVID-19 or common cold, and some bacterial infections can cause widespread body ... EI is caused by two subtypes of influenza A viruses: H7N7 and H3N8, of the family Orthomyxoviridae. They are related to but distinct from the viruses that cause ... Mar 8, 2024 ... Influenza encephalitis · Symptoms. In a broad sense, clinical characteristics encompass a combination of flu symptoms and central nervous system ... Jan 15, 2019 ... Colds and the flu are both caused by viruses, but not the same virus. They have similar symptoms and both affect the respiratory system. Avian influenza, commonly known as “bird flu,” is a highly contagious disease caused by certain influenza A viruses. These viruses mainly infect and spread ... A major cause of respiratory failure in the acute phase of ARDS is damage to the epithelial–endothelial barrier of the pulmonary alveolus, where gas exchange ... Influenza viruses cause the flu. There are four types of flu viruses: influenza A, B, C and D.6 The viruses tend to change in two ways: antigenic drift and ... Four themes were identified as causes of vaccine hesitancy comprising: concerns over safety, lack of trust, lack of need for vaccination and cultural reasons. Avian influenza (AI) is caused by influenza type A viruses that historically have spread between wild birds (waterfowl and shorebirds) with occasional ... Jan 4, 2023 ... Seasonal influenza (flu) season is here. There are four types of influenza viruses: A, B, C, and D. Influenza A and B viruses cause seasonal ...