Bird flu occurs basically every year, with the last outbreak in China in 2004.

Bird flu swept through the United States and parts of Asia in early 2004, with millions of poultry in China, Japan, and Vietnam dying of the disease, and many people possibly passing away from infection with the bird flu virus.

Based on the results of a survey of existing human cases of H7N9 and H5N1 avian influenza, it is believed that the incubation period is generally less than seven days. Severe patients with rapid progression of the disease, mostly in 5 to 7 days, severe pneumonia, body temperature mostly persisted above 39 ℃, respiratory distress, may be accompanied by hemoptysis sputum; can rapidly progress to acute respiratory distress syndrome, septicemia, infectious shock, and in some patients, mediastinal emphysema, pleural effusion, etc..

A considerable proportion of severely ill patients are simultaneously combined with injury or failure of multiple other systems or organs, such as myocardial injury leading to heart failure, individual patients also show digestive symptoms such as gastrointestinal hemorrhage and stress ulcers, and coma and impaired consciousness have also occurred in some severely ill patients.

Preventive measures:

Combined with the characteristics of avian influenza viruses and the findings of existing research, it is now believed that virus-carrying birds are the main source of infection for human infection of avian influenza. It is particularly important to reduce and control the spread of avian influenza viruses among birds, especially poultry.

With the improvement of China's social and economic development level, there is an urgent need to accelerate the promotion of traditional poultry farming and distribution to modern production methods of transformation and upgrading, from backyard farming methods to centralized large-scale breeding, slaughtering and processing and scientific transportation, to improve the level of poultry and livestock breeding, distribution of biosecurity, thereby reducing the population's exposure to live or dead birds.

At the same time, health education should be carried out on an ongoing basis to advocate and cultivate personal respiratory hygiene and preventive habits, such as washing hands frequently, keeping the environment clean, and processing and cooking food in a reasonable manner. Need to especially strengthen the human infection of avian influenza high-risk groups and health care workers health education and health protection.