4hw.org: Recently, there has been another outbreak of avian influenza in South Korea, which has aroused many people's concerns. It is reported that this avian influenza is h5n8 highly pathogenic type. Why does it happen again and again after so many years of struggle between humans and avian influenza? First of all, we need to know what is avian influenza?
1. What is avian influenza?
A: avian influenza mainly refers to the infectious diseases caused by influenza virus that are prevalent in birds and animals. According to different types of pathogens, avian influenza can be divided into high pathogenicity, low pathogenicity and non pathogenicity. The incidence and mortality of highly pathogenic avian influenza are both high. It is listed as a class a animal disease by the world organization for animal health, and as a class a animal disease in China. This article is edited and collated by sihai.com, reprinted and noted with the source. The original link: http://www.4hw.com.cn/life/jiankang.html
2. What is human infection with avian influenza?
Due to the species barrier, avian influenza virus can infect people only by chance. Previously, it was confirmed that H5N1, H9N2, H7N2, H7N3, H7N7, H5N2 and H10N7 were the avian influenza viruses infecting people. The disease manifestations were different, which could be respiratory symptoms, conjunctivitis and even death. When human interfered with highly pathogenic H5N1 avian influenza virus, they often showed respiratory symptoms such as high fever, often very quickly It develops into pneumonia, even acute respiratory distress syndrome and systemic organ failure, even death.
Characteristics of people infected with avian influenza
The incubation period of human infected with avian influenza is generally within 7 days. The early symptoms are very similar to common influenza, mainly manifested as fever, runny nose, nasal obstruction, cough, sore throat, headache, and general malaise. Some patients may have gastrointestinal symptoms such as nausea, abdominal pain, diarrhea, etc., while a few patients may have conjunctivitis. Most patients have short course, fast recovery, good recovery and no sequelae. However, a few patients, especially those who are older and not treated in time, will develop rapidly into progressive pneumonia and acute respiratory distress syndrome. If not treated in time, they will die.
At present, the confirmed cases of h7n9 avian influenza are characterized by typical viral pneumonia, acute onset, high fever (above 38 ℃), cough and other respiratory infection symptoms in the early stage of the course. Dyspnea occurred 5-7 days after the onset of the disease, severe pneumonia and progressive aggravation, some cases can rapidly develop into acute respiratory distress syndrome and die.
At present, the understanding of the clinical characteristics of the disease is very limited, whether the virus infection can cause light cases or other clinical manifestations is not clear. With the accumulation of more case information, the understanding of the disease will change.