Virus Influenza Type A. This virus has evolved a number of mechanisms that enable it to invade host cells and subvert the host cell machinery for its own purpose that is for the sole production of more virus. They are also vulnerable to heat and a low pH depending on the virus type.
Subtypes of influenza A are categorized based on two proteins on the surface of the virus hemagglutinin H and neuraminidase N. Influenza A and B are the two types of influenza that cause epidemic seasonal infections nearly every year. There are two different kinds of spikes each made of a different protein one is the hemagglutinin HA protein and the other is the neuraminidase NA protein.
A pandemic can occur when a new and different influenza A virus emerges that both infects people and has the ability to spread efficiently among people.
Influenza A viruses are the only influenza viruses known to cause flu pandemics ie global epidemics of flu disease. A myxovirus of the genus Influenzavirus antigenically varying from influenza virus types B and C that causes acute respiratory illness in humans and infections in birds and certain other animals. Avian influenza AI is caused by an influenza type A virus that can infect poultry such as chickens turkeys pheasants quail domestic ducks geese and guinea fowl. There are two different kinds of spikes each made of a different protein one is the hemagglutinin HA protein and the other is the neuraminidase NA protein.
