At present, the outbreak of influenza in Hong Kong in summer has killed 327 people, and everyone is very scared, and influenza is very easy to infect, so many people are very worried about whether Guangzhou will be infected? Does Hong Kong influenza have a great impact on Guangzhou?
Whether the 2017 Hong Kong flu affects Guangzhou and Guangzhou has entered a high influenza incidence period.
Seasonal influenza is an acute respiratory disease caused by influenza virus. In Hong Kong, influenza is generally prevalent from January to March, July and August. The last influenza peak occurred between the end of 2014 and the beginning of 2015.
It is worth noting that influenza pandemics have occurred every 10 & ndash; 50 years in the past. The time of the pandemic is unpredictable. Influenza pandemic is usually accompanied by more cases of infection and serious illness, leading to higher mortality and great impact on social economy.
The cause of influenza in Hong Kong in 2017 is influenza, which is an acute respiratory infectious disease caused by influenza virus. Seasonal influenza refers to the influenza virus that widely spreads and causes diseases among people in the influenza season every year.
Influenza A virus can be classified into several subtypes according to different types and binding conditions of virus surface proteins. Among them, influenza A (H1N1), H3N2 and B are common in human transmission and epidemic in recent years.
Influenza viruses are prone to mutation. When a small variation occurs, no new subtype will be generated, and more small and medium-sized influenza epidemics will be caused. About every two to five years, there will be a new variant strain, such as a (H3N2) influenza virus' Switzerland 'and' Texas'. When a large variation occurs, new subtypes can be generated, which often lead to a world pandemic of influenza, such as H1N1 in 2009.
Influenza pandemics are uncommon. A pandemic will occur when a new type of influenza virus that is significantly different from the one that has already been circulating appears. Due to the limited or no resistance to the new virus, the new virus can easily spread and cause diseases between people.
Yuan Guoyong, Professor of Microbiology at the University of Hong Kong, and long Zhenbang, honorary assistant professor, checked the literature and found that there was no antigenic drift in Hong Kong's influenza, but there was a small antigenic variation (n121k), leading to the failure of previous vaccines. This may be one of the reasons for this influenza peak.
The data shows that from July 2016 to March this year, 20% of H3N2 strains in Hong Kong showed mutation, and by May this year, the mutation rate was more than 30%. Of the 431 adult cases (age 18 or older) with severe influenza, 385 were infected with H3N2.
From March to July 29 this year, the proportion of influenza A (H3N2) detected by the Hong Kong Department of health was 88.8%, which was usually high in the elderly population.
The flu crisis has spread to Shenzhen, a bridge from Hong Kong. Shenzhen has the highest level of influenza warning for three consecutive weeks, and this week is still in the 'critical period'. According to the analysis of the surveillance data of Shenzhen influenza surveillance outpost hospital, the influenza index from August 2 to August 8 is level I (extremely easy to occur), indicating that the influenza epidemic intensity is high.
On August 2, Qu Haifeng, deputy director of Shenzhen entry exit inspection and Quarantine Bureau, said through the official microblog of Shenzhen health and family planning commission that in June this year, more than 800 cases of influenza were detected at Shenzhen ports, and 1222 cases were detected from July 1 to 26, an increase of about 50%.