Remedies for Influenza

Influenzavirus A

This genus has one species, influenza A virus. Wild aquatic birds are the natural hosts for a large variety of influenza A. Occasionally, viruses are transmitted to other species and may then cause devastating outbreaks in domestic poultry or give rise to human influenza pande mics.The type A viruses are the most virulent human pathogens among the three influenza types and cause the most severe disease. The influenza A virus can be subdivided into different serotypes based on the antibody response to these viruses.The serotypes that have been confirmed in humans, ordered by the number of known human pandemic deaths, are:

H1N1, which caused Spanish flu in 1918, and the 2009 flu pandemic

H2N2, which caused Asian Flu in 1957

H3N2, which caused Hong Kong Flu in 1968

H5N1, a current pandemic threat

H7N7, which has unusual zoonotic potential

H1N2, endemic in humans and pigs

Influenzavirus B

This genus has one species, influenza B virus. Influenza B almost exclusively infects humans and is less common than influenza A. The only other animals known to be susceptible to influenza B infection are the seal and the ferret.This type of influenza mutates at a rate 2–3 times lower than type A and consequently is less genetically diverse, with only one influenza B serotype. As a result of this lack of antigenic diversity, a degree of immunity to influenza B is usually acquired at an early age. However, influenza B mutates enough that lasting immunity is not possible

Influenzavirus C This genus has one species, influenza C virus, which infects humans, dogs and pigs, sometimes causing both severe illness and local epidemics. However, influenza C is less common than the other types and usually only causes mild disease in children.