The Different Varieties of Influenza
There exists a wide array of strains when it comes to the influenza virus. As a result of its frequent mutations, virologists have classified it into three primary categories: A, B, and C. Among these, Type A influenza is responsible for the majority of seasonal flu cases, affecting both humans and animals. On the other hand, Type B influenza is exclusively found in humans and causes seasonal illness. Although it is less common, it is generally milder compared to Type A. Lastly, Type C influenza only affects humans and is significantly less severe than both Type A and Type B. According to statistics, the flu leads to approximately 200,000 hospital visits each year in the United States.
Understanding the Distinct Characteristics of Type A Flu
Type A Flu, which necessitates a scientific explanation, is classified by the Center for Disease Control and Prevention as follows: “Influenza A viruses are categorized into subtypes based on two surface proteins: hemagglutinin (HA) and neuraminidase (NA).” This specific type of flu comprises 18 identified HA subtypes and 11 NA subtypes. By combining these subtypes and proteins, the virus can easily and efficiently undergo mutations. The remarkable flexibility of its viral structure poses a significant threat to humans and other mammals. Comparatively, Type B and Type C flu viruses exhibit less capability for mutation.