Type A Influenza: Symptoms, Treatment, and Prevention
Dec 21, 2018 · Influenza A symptoms can be confused with signs of other conditions but are usually more sudden and severe. Learn symptoms of this infection, how it’s diagnosed, treatment options, …
Influenza A: Symptoms, Treatment, and More - Health
Oct 19, 2025 · Influenza A often causes fever, cough, and fatigue. This highly contagious virus primarily affects the respiratory system, including your nose, throat, and lungs.
Types of Influenza Viruses | Influenza (Flu) | CDC
Sep 26, 2025 · There are four types of influenza viruses: A, B, C, and D. Influenza A and B viruses cause seasonal epidemics of disease in people (known as flu season) almost every winter in the …
Influenza (flu) - Symptoms and causes - Mayo Clinic
Dec 19, 2025 · Flu, also called influenza, is an infection of the nose, throat and lungs, which are part of the respiratory system. The flu is caused by a virus. Influenza viruses are different from the "stomach …
Influenza A virus - Wikipedia
Flu season is an annually recurring time period characterized by the prevalence of an outbreak of influenza, caused either by Influenza A or by Influenza B. The season occurs during the cold half of …
Influenza A Symptoms: Early Signs, Severe Risks, Care
Dec 15, 2025 · Learn influenza A symptoms, early warning signs, severe complications, and when to seek care, with expert clinical insights and trusted sources.
Influenza - Infectious Diseases - Merck Manual Professional ...
Influenza refers to illness caused by the influenza viruses, but the term is commonly and incorrectly used to refer to similar illnesses caused by other viral respiratory pathogens. Influenza viruses are …