Influenza is an acute infection caused by any of three types of viruses (A, B, or C). Type A strains are associated with the most severe disease. Many people confuse influenza or flu with the common cold. They are different. The common cold can be caused be a variety of viruses that infect the upper respiratory system (nose, mouth, throat). Flu is caused by several types of influenza virus and is usually more severe than a cold.In 2009, a new type A strain emerged called H1N1. Because there was little immunity in the human population to the H1N1 strain, it had the ability to spread easily from person to person worldwide and sicken even more people than a usual seasonal strain. When this happens, it is called a pandemic. In July 2009, a worldwide pandemic of H1N1 was declared, but this was over in August, 2010.

Flu is an acute infection of the airway tract in the nose and throat that can sometimes spread down into the lungs. Flu in adults is a frequent cause of acute respiratory illness. Flu, however, affects people of all ages. Children are among the groups most at risk for developing flu and its complications and are more likely to spread the infection to others.

Flu season (a sharp increase in reported cases) usually begins in late fall and early winter, and cases usually spread widely. The peak season for the flu in the northern hemisphere is from November through March, although cases can be seen all year long.

Source: http://www.emedicinehealth.com

Influenza is an acute infection caused by any of three types of viruses (A, B, or C). Type A strains are associated with the most severe disease. Many people confuse influenza or flu with the common cold. They are different. The common cold can be caused be a variety of viruses that infect the upper respiratory system (nose, mouth, throat). Flu is caused by several types of influenza virus and is usually more severe than a cold.In 2009, a new type A strain emerged called H1N1. Because there was little immunity in the human population to the H1N1 strain, it had the ability to spread easily from person to person worldwide and sicken even more people than a usual seasonal strain. When this happens, it is called a pandemic. In July 2009, a worldwide pandemic of H1N1 was declared, but this was over in August, 2010.

• Flu is an acute infection of the airway tract in the nose and throat that can sometimes spread down into the lungs. Flu in adults is a frequent cause of acute respiratory illness. Flu, however, affects people of all ages. Children are among the groups most at risk for developing flu and its complications and are more likely to spread the infection to others.
• Flu season (a sharp increase in reported cases) usually begins in late fall and early winter, and cases usually spread widely. The peak season for the flu in the northern hemisphere is from November through March, although cases can be seen all year long.

Source: http://www.emedicinehealth.com

The flu is caused by one of three types of influenza viruses. Types A and B are responsible for the yearly flu epidemics, and type C causes sporadic illness. Type A is further divided into different subtypes based on the chemical structure of the virus.

Source: http://www.emedicinehealth.com

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Source: http://www.emedicinehealth.com

Influenza is an acute infection caused by any of three types of viruses (A, B, or C). Type A strains are associated with the most severe disease. Many people confuse influenza or flu with the common cold. They are different. The common cold can be caused be a variety of viruses that infect the upper respiratory system (nose, mouth, throat). Flu is caused by several types of influenza virus and is usually more severe than a cold.In 2009, a new type A strain emerged called H1N1. Because there was little immunity in the human population to the H1N1 strain, it had the ability to spread easily from person to person worldwide and sicken even more people than a usual seasonal strain. When this happens, it is called a pandemic. In July 2009, a worldwide pandemic of H1N1 was declared, but this was over in August, 2010.

• Flu is an acute infection of the airway tract in the nose and throat that can sometimes spread down into the lungs. Flu in adults is a frequent cause of acute respiratory illness. Flu, however, affects people of all ages. Children are among the groups most at risk for developing flu and its complications and are more likely to spread the infection to others.
• Flu season (a sharp increase in reported cases) usually begins in late fall and early winter, and cases usually spread widely. The peak season for the flu in the northern hemisphere is from November through March, although cases can be seen all year long.

Source: http://www.emedicinehealth.com