What does fact checked mean?
At Healthfully, we strive to deliver objective content that is accurate and up-to-date. Our team periodically reviews articles in order to ensure content quality. The sources cited below consist of evidence from peer-reviewed journals, prominent medical organizations, academic associations, and government data.
The information contained on this site is for informational purposes only, and should not be used as a substitute for the advice of a professional health care provider. Please check with the appropriate physician regarding health questions and concerns. Although we strive to deliver accurate and up-to-date information, no guarantee to that effect is made.
The influenza virus is the second most common respiratory illness in the world, next to the common cold, according to 2005 information from Florida State University, with an estimate that 25 to 50 million Americans contract the flu each year 1. Highly contagious and most prevalent during the winter, the flu may present with muscle aches and pains, sore throat, fatigue, dry cough and runny nose, and in extreme cases, may lead to death. The influenza pathogen consists of three types.
If you are experiencing serious medical symptoms, seek emergency treatment immediately.
Twenty-five different subtypes of type A influenza exist, notes the Centers for Disease Control and Prevention 2. The type A influenza pathogen has the ability to change its viral makeup. This process is fast and is called antigenic shift. There may be several major changes during the same flu season. The CDC notes that in 2009, a major shift produced the H1N1 influenza pandemic.
- Twenty-five different subtypes of type A influenza exist, notes the Centers for Disease Control and Prevention 2.
- The type A influenza pathogen has the ability to change its viral makeup.
About Type B Strain Flu
The type B influenza pathogen does not change as swiftly as the type A virus, making it easy to monitor. The CDC describes the process as antigenic drift, which produces smaller changes in the viral makeup over a longer period of time. Vaccines are constantly being updated to stay current with the pathogen's ability to change.
Type C influenza virus is different from type A and type B virus, genetically and morphologically, according to the Florida State University 1. Because of the resulting mild symptoms, type C is thought to be of little medical threat.
About Type B Strain Flu
Differences Between Influenza A and B
Sweating, Chills, Fatigue & Nausea Symptoms
Flu-Like Symptoms After a Flu Shot
How Does Valtrex Work?
Symptoms of Type A Influenza
What Is the Incubation Period for the Flu?
Signs & Symptoms of Type A Influenza
The Different Stages of a Common Cold
Causes of Fever, Headache and Dry Cough
- Chepko/iStock/Getty Images