As flu season kicks off, health experts around the world are sounding the alarm over a new strain of the virus that appeared in June, four months after the composition of this year’s flu vaccines had already been set. This new variant, a version of H3N2, is triggering outbreaks in Canada and the U.K., where authorities are warning of an early wave sending people to hospitals. “Since its appearance, it has spread quickly and is now the dominant strain in several Northern Hemisphere countries,” said Dr. Wenqing Zhang, head of the World Health Organization’s Global Respiratory Threats Unit, during a briefing on Wednesday. The concern comes because the flu strain has mutated. With many people already vaccinated, the question now is: will the flu shot still offer protection?What Is H3N2 Strain That Is Spreading In UK And Canada?H3N2 is a type of influenza virus and is recognized as one of the two main strains circulating widely. Also referred to as subclade K, it is currently the most prevalent strain in England, according to the UK Health Security Agency (UKHSA).Symptoms Of H3N2 StrainThe H3N2 strain can cause a sudden high fever, persistent cough, sore throat, body aches, and fatigue. Other typical symptoms include chills, headaches, and nasal congestion. While most people recover within a few days, H3N2 infections can linger longer than other flu strains, with cough and weakness sometimes lasting for weeks.Is This Flu Strain Already In The U.S.?H3N2 is classified as an influenza A strain. Although anecdotal reports suggest some people across the U.S. have tested positive for flu A, detailed nationwide data is limited. The Centers for Disease Control and Prevention (CDC) hasn’t released a full report on flu activity since September 26, largely due to the government shutdown.Will This Year’s Flu Shot Be Helpful?Each year in February, global health authorities and pharmaceutical companies decide which viral strains to include in fall flu vaccines for the Northern Hemisphere, based on circulating strains observed in the Southern Hemisphere. This year’s flu shot protects against three influenza strains — two types of influenza A and one type of influenza B.It’s important to note that the flu vaccine does not completely prevent infection. Its primary role is to reduce the severity of illness. Last year, vaccines were up to 55% effective in keeping adults out of hospitals. Preliminary data released by U.K. health authorities on Tuesday shows this year’s vaccine is around 40% effective in preventing hospitalization among adults, according to the NHS.Despite the mismatch, experts still encourage vaccination. Schaffner said, “Decades of data show that even when the match isn’t perfect, the vaccine helps prevent hospitalizations, ICU admissions, and can literally save lives.”What Happens If You Skip A Flu Shot?Skipping vaccination leaves people at higher risk of severe illness. During the last flu season, two-thirds of hospitalized patients in the U.S. were not vaccinated, according to CDC data. Even more concerning, 90% of children who died from the flu hadn’t received a full course of vaccines. Guidance recommends that children under nine who have never been vaccinated should get two doses, while everyone else receives a single annual shot.
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