What caused H3N2?
The 1968 pandemic was caused by an influenza A (H3N2) virus comprised of two genes from an avian influenza A virus, including a new H3 hemagglutinin, but also contained the N2 neuraminidase from the 1957 H2N2 virus. It was first noted in the United States in September 1968.
How long does influenza A last in a child?
Most children recover from the flu within a week. But they may still feel very tired for as long as 3 to 4 weeks. A cold is usually mild and often goes away after a few days. The flu can cause severe symptoms and lead to problems such as pneumonia and even death.
What are the symptoms of H3N2 flu virus?
Symptoms of H3N2
- cough.
- runny or congested nose.
- sore throat.
- headache.
- body aches and pains.
- fever.
- chills.
- fatigue.
Is influenza A very contagious?
Outlook. Type A influenza is a contagious viral infection that can cause life-threatening complications if left untreated. While some cases of this infection can improve without prescribed medication, a visit to your doctor is recommended.
What are the symptoms of influenza A H3N2?
Symptoms that can signal an emergency and warrant prompt medical attention include: feeling short of breath or having trouble breathing. appearance of pain or pressure in your chest or abdomen. dizziness that comes on suddenly. persistent, severe vomiting. feelings of confusion.
What are types of flu?
There are four types of influenza viruses: A, B, C and D. Human influenza A and B viruses cause seasonal epidemics of disease almost every winter in the United States. The emergence of a new and very different influenza A virus to infect people can cause an influenza pandemic.
How are the subtypes of the influenza virus named?
Subtypes are named by combining the H and N numbers – e.g., A (H1N1), A (H3N2). Click on the image to enlarge the picture. There are four types of influenza viruses: A, B, C and D. Human influenza A and B viruses cause seasonal epidemics of disease (known as the flu season) almost every winter in the United States.
How many ha and NA proteins are there in influenza?
There are 18 known HA subtypes and 11 known NA subtypes. Many different combinations of HA and NA proteins are possible. For example, an “H7N2 virus” designates an influenza A virus subtype that has an HA 7 protein and an NA 2 protein. Similarly, an “H5N1” virus has an HA 5 protein and an NA 1 protein.