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Seasonal Influenza

Seasonal Influenza

2017-11-30

Seasonal influenza is a common respiratory tract infection caused by human seasonal influenza viruses. It is totally different from avian influenza and influenza pandemic. In Hong Kong, seasonal influenza  is usually more common in periods from January to March and from July to August.

In contrast, avian influenza (AI) is caused by those influenza viruses that mainly affect birds and poultry, such as chickens or ducks. These AI viruses are distinct from human seasonal influenza viruses. Since the AI viruses does not commonly infect human, there is little or no immune protection against them in the human population. People mainly become infected with AI through direct contact with infected birds and poultry (live or dead), their droppings or contaminated environments.

Influenza pandemic occurs roughly every 10 – 50 years and may strike anytime. It is caused by emergence and global spread of a novel influenza virus originated from an animal influenza virus (e.g. avian influenza virus) undergoing major genetic changes resulting in efficient human-to-human transmission. The human population has low or no immunity against the emerging pandemic influenza virus. Influenza pandemic is usually associated with a great number of cases, higher severity of illness, a higher death toll and consequently greater social and economic disruption.

For more details on seasonal influenza and its prevention, please refer to Seasonal Influenza.

For details on seasonal influenza vaccination, please refer to Vaccination Schemes.
 

Prevention of Seasonal Influenza

 

Proper Hand Hygiene
With Soap And Water
Proper Hand Hygiene
With Soap And Water

Proper Hand Hygiene
Alcohol-Based Handrub
Proper Hand Hygiene
Alcohol-Based Handrub

Proper Use of Mask
Proper Use of Mask
 


 Details

 

Preparedness and Response Plan

 

Latest Influenza Updates

 

Press Releases

 

Letters

 

Guidelines

 

Health Education Materials

 

Related Links and Issues