Scientists are cautioning that a new strain of influenza, which has already caused significant illness in Japan, Canada, and the U.K., might lead to a tough flu season in the U.S.
This strain is a variant of H3N2, a subtype of influenza A that has already increased hospitalizations abroad, putting pressure on health care systems.
What is the new flu variant?
Named subclade K, this new variant represents a mutation of the H3N2 strain.
The flu virus tends to mutate rapidly, and this subtype emerged over the summer, featuring seven new mutations.
Why are scientists concerned about this strain of flu?
Subtype K has proliferated in various locations, including Japan, Canada, and the U.K., where it has led to some severe health cases requiring hospitalization.
This variant emerged after this year’s flu vaccine was formulated, which targets a different H3N2 subtype.
What are the symptoms of H3N2?
The symptoms for this strain are akin to typical flu ones: body aches, fever, cough, sore throat, headache, fatigue, chills, sweating, and a runny nose.
What should I do if I think I have H3N2?
If you suspect you might have it, it’s best to get in touch with your healthcare provider to be tested for the flu, which can specify the strain involved.
Antiviral treatments, like Tamiflu, can help but should be initiated within the first couple of days after symptoms begin.
Does the flu shot protect against H3N2?
While scientists are still analyzing data, there’s a possibility that this year’s flu shot might be somewhat less effective against subtype K, as it was developed before this particular variant was identified. Researchers indicate that its efficacy might be more aligned with the end of flu season protection level, which is typically lower due to mutations.
For the vaccine, scientists used predictions to ascertain which flu strains would be dominant in the coming year. This year’s vaccine was formulated to combat influenza B and two subtypes of influenza A, including an earlier H3N2 subclade.
Initial studies suggest that the vaccine still offers a 70% to 75% protection rate against hospitalization in children and around 30% to 40% in adults.
It also provides the standard benefits against other circulating flu strains.
How can I prevent H3N2?
Getting vaccinated remains the best defense against various flu strains, even if the shot’s effectiveness is slightly reduced.
Aside from vaccination, frequent handwashing and refraining from touching your face are good practices to avoid flu contraction. Ideally, if you cough or sneeze, use your elbow or a tissue to minimize the spread of germs.
If you or your child is feeling unwell, it’s best to stay home from work or school until recovery is complete.
Is H3N2 in the US?
Currently, it’s uncertain if subtype K is present in the U.S. or how widespread it might be.
The previous government shutdown resulted in the Centers for Disease Control and Prevention halting its data collection and publication. Although the shutdown has ended, the agency faces significant workforce reductions that may affect its ability to monitor diseases effectively.
According to CDC data, there are low but increasing levels of flu cases, with H3N2 being the dominant strain, yet the specific subtype in circulation has not been identified.
What happens if there is an outbreak of H3N2?
It remains unclear whether H3N2 causes more severe illness for most people.
Individuals with chronic health conditions, compromised immune systems, young children, the elderly, and pregnant individuals are at heightened risk of severe flu-related illness, no matter the strain.
If a significant outbreak occurs, it might overwhelm healthcare resources, challenging the system’s capacity to provide care adequately.
