What are the factors that contribute to the mismatch between circulating influenza strains and vaccine strains?

Feb 4, 2025 ... Pneumonia symptoms and causes · Bacterial pneumonia. · Viral pneumonia. Various viruses can cause this type, including the influenza virus, and it ... Dog flu is a common term to describe a contagious upper respiratory infection in dogs caused by the canine influenza virus. Jan 20, 2025 ... Sinusitis, a common flu complication, can extend the illness by 10–15 days due to nasal congestion and sinus blockages that intensify symptoms. The 1918 influenza pandemic was the most severe pandemic in recent history. It was caused by an H1N1 virus with genes of avian origin. May 1, 2023 ... Infectious Agent. Influenza is caused by infection of the respiratory tract with influenza viruses, RNA viruses of the Orthomyxovirus genus. The Flu. Similarly, the influenza virus leads to head congestion by infecting your nose, throat and lungs, and causing nasal swelling. People often confuse a ... What is the flu? · How does the flu spread? · Does your child need a flu vaccine every year? · Are some children more likely to have serious health problems caused ... Symptoms of the common cold caused by the rhinovirus include sore throat, runny nose, coughing, sneezing, watery eyes, headaches, and body aches. Jun 8, 2017 ... Antigenic drift in human flu viruses is what causes the changes in seasonal flu viruses each year and is why the seasonal flu vaccine must be ... The common cold leads to more health care provider visits and absences from school and work than any other illness each year. It is caused by a virus and is ...