Difference between Influenza B and Influenza A
Disease description:
The flu has been particularly severe lately; some people around me have contracted influenza A, while others have influenza B. I myself have been feeling a bit unwell and wanted to find out—what exactly is the difference between influenza A and influenza B?
Doctor's answer (1)
Dr. Ren Yi
Influenza A and influenza B are both respiratory infections caused by influenza viruses, but there are some important differences between them. They differ in viral characteristics, symptom presentation, geographic spread, and disease course.
Influenza B is caused by the influenza B virus, while influenza A is caused by the influenza A virus. Symptoms of influenza B are generally milder and commonly include fever, chills, fatigue, body aches, cough, runny nose, and nasal congestion. Influenza A symptoms are usually more severe and may include persistent high fever, nausea, vomiting, muscle pain, headache, cough, sore throat, runny nose, and sneezing.
The influenza A virus can be divided into different subtypes, among which H1N1 and H3N2 are more common. This virus not only infects humans but also spreads among animals such as birds and pigs. The influenza A virus is highly contagious and can easily cause global pandemics. In contrast, the influenza B virus infects only humans and generally does not lead to severe epidemic outbreaks, although it can cause seasonal flu epidemics.
Influenza B typically causes localized outbreaks and is less contagious. Influenza A is more likely to cause widespread epidemics and is more transmissible. The course of influenza B is relatively short, usually lasting 5–7 days, with a faster recovery. Influenza A has a longer disease course, typically lasting 7–15 days, and may be complicated by additional health problems, resulting in a slower recovery.
It is recommended to seek timely medical attention and follow the guidance of a physician for treatment.
