Current A has just receded, and current B is on the rise again. The “Influenza Surveillance Weekly Report” released by the National Influenza Center shows that the proportion of influenza A infections has dropped significantly, while the proportion of influenza B infections has increased. People often have a question: If you have had influenza A, will you have immunity against influenza B? In fact, this is not the case. If you don’t pay attention to protection, you will still get infected! Today, experts from the Beijing Center for Disease Control and Prevention will introduce to you the differences and prevention of these two viruses.
What is the difference between Class A and Class B?
Influenza is an acute respiratory infectious disease caused by influenza viruses. Influenza viruses are mainly spread through respiratory droplets produced by sneezing and coughing of infected people. Influenza viruses can also be infected through direct or indirect contact with mucous membranes such as the mouth, nose, eyes, etc.
Influenza viruses can be divided into four types: A, B, C and D. The main causes of seasonal influenza epidemics are type A and type B influenza viruses. They all contain two major surface proteins, hemagglutinin and neuraminidase, but their structures are different, resulting in greater antigenic differences between them, but little difference in pathogenicity.
The composition of influenza A and B viruses also changes alternately in different influenza seasons or at different times in the same influenza season.
If you get stream A, will you get stream B?
Some people think that if you have influenza A, you will be immune to influenza B, but this is not true. Specific antibodies produced after infection with influenza A virus do not provide effective protection against influenza B infection, and vice versa. In other words, after being infected with influenza A, you can still be infected with influenza B.
Liu Yafen, an infectious disease specialist at Peking University People’s Hospital, said that B-fluid is usually small-scale or sporadic, so there is no need to worry too much about the rising proportion of B-fluid. There is not much difference in clinical symptoms between influenza B and influenza A. Fever, chills, headache, joint pain, and muscle pain are common symptoms. In addition, some patients may also experience symptoms such as sore throat, cough, chest tightness and shortness of breath.
Regardless of influenza A or B, severe cases can develop into pneumonia, myocarditis, or some complications of the nervous system. However, as patients currently seek medical treatment in a timely manner, influenza combined with pneumonia is rare, accounting for about 10% of the total number of cases.
How to prevent the flu as the Spring Festival is approaching?
The winter vacation and Spring Festival are approaching, and the mobility of people is increasing. Regardless of influenza A or B, through scientific protection, we can better protect ourselves. Beijing CDC reminds everyone to do the following in daily life:
Pay attention to personal hygiene and wash your hands frequently. Wash your hands after going home, before meals and after using the toilet, and before and after touching your eyes, nose or mouth. Cover your mouth and nose when coughing and sneezing, and do not spit.
Wear a mask scientifically when you have flu-like symptoms such as fever, sore throat, cough, etc.; when going to medical institutions for treatment or accompanying others; when taking public transportation or going to crowded places.
Maintain air circulation in your home and open windows for ventilation 2-3 times a day, for no less than 30 minutes each time. When opening windows for ventilation, pay attention to keeping warm and cold.
Avoid contact with patients with fever. Once there is a fever patient at home, pay attention to reduce contact with the patient. Wear a mask when in contact, and do not touch your eyes, nose, or oral mucosa after contact. Especially wash your hands frequently. Pay attention to disinfection of the home environment and increase the frequency of indoor ventilation.
Try to avoid going out in places with dense crowds and dirty air. According to the weather conditions, add or remove clothes at any time to avoid getting cold.
Maintain a healthy lifestyle to enhance the body’s immunity. Eat three meals a day regularly, with a reasonable proportion of staple food, fruits and vegetables, poultry, fish, meat and eggs. Eat more fresh vegetables and fruits and have a balanced diet; exercise moderately and ensure sleep; quit smoking and limit alcohol; maintain your mentality. peaceful.
You should pay close attention to your health status if abnormal symptoms such as fever and acute respiratory infection occur, and take measures such as resting at home, taking medicine, or seeking medical treatment in a timely manner according to the situation. If the condition worsens or the original underlying disease is significantly aggravated, you should seek medical treatment immediately.
Timely vaccination can significantly reduce the risk of influenza and serious complications in recipients. The influenza vaccine this epidemic season contains influenza B antigen components and is more effective in protecting against influenza B infection.