Health officials are closely monitoring a surge in H3N2 influenza cases, driven by a mutated strain spreading at an unusually rapid pace and earlier than typical for this time of year. Experts warn this could signal a particularly severe flu season, possibly one of the worst in a decade, as the virus – which originated in Australia – gains traction globally and is now being detected in Turkey, beginning in the southeastern region. This report details the latest observations from medical professionals regarding the spread, contagiousness, and potential impact on healthcare systems.
A mutated strain of the H3N2 influenza virus is triggering concern among health officials as it spreads faster than anticipated and weeks ahead of schedule in many parts of the world. The unusual early surge in cases is raising fears of a potentially severe flu season, with experts warning it could be one of the worst in a decade.
The new H3N2 variant, which originated in Australia and has undergone at least seven mutations, is rapidly spreading across continents, from the United Kingdom to Japan. This widespread activity is prompting heightened surveillance and preparedness efforts globally. The early spread of the virus underscores the importance of annual flu vaccination and preventative measures to mitigate potential health impacts.
While a widespread outbreak in Turkey was previously considered unlikely, cases are now being observed, particularly in the southeastern region, including Diyarbakır. This indicates the virus has already entered the country and is beginning to circulate.
“In the coming weeks, we expect to see cases increase in other major cities as well,” said Dr. Yavuz Burak Tor, an internal medicine specialist, noting that while major metropolitan areas like Istanbul, Ankara, and İzmir haven’t yet experienced a significant surge, the virus’s presence elsewhere in the country is a warning sign.
Dr. Tor emphasized that this shouldn’t lead to complacency. “The virus is circulating in different regions of the world and in some cities in Turkey. The fact that cases are appearing earlier in some provinces, like Diyarbakır, is an indication that the virus has entered the country,” he explained. He added that flu waves typically arrive in larger cities a few weeks later, and a further increase in cases is expected with colder weather and more time spent indoors.
Are there any changes in the symptoms of the new mutated flu?
Dr. Süleyman Alpar, head of emergency services at a private hospital, said the symptoms haven’t changed and no new symptoms have been added to the list, and highlighted the following signs:
Fever
Sore throat
Headache
Muscle and joint pain
Runny or stuffy nose
Fatigue
Cough
“The mutated flu is spreading faster,” said Dr. Furkan Timur, a pediatric health specialist, explaining that the increased speed of the virus is evident in the current outbreak in Diyarbakır. He added that the early start of the seasonal flu activity in Europe is now beginning to translate into increased cases in Turkey.
While the situation hasn’t yet reached a global pandemic threshold, Dr. Timur noted that the virus’s effects may last longer and its high contagiousness could make this winter a more challenging one for Turkey. The potential for a prolonged and widespread outbreak emphasizes the need for continued vigilance and preventative measures.
What does it mean when it’s said that one infected person with H3N2 infects 140 others?
“This statement describes the rate at which the virus spreads. In a normal flu season, 100 people can infect approximately 120 others,” explained Dr. Süleyman Alpar, “In this new H3N2 variant, that number is estimated to be 140. While the difference may seem small, the chain of infection is accelerating and case numbers are rising more quickly. In short, it’s not twice as contagious, but there’s a difference that makes the wave grow faster.”
“The main reason we feel this season will be more intense than other years isn’t just the H3N2 flu virus,” said Dr. Furkan Timur, highlighting the concurrent circulation of other respiratory viruses. He explained that, in addition to H3N2, RSV and rhinovirus are also active at the same time. This combination of viruses is contributing to a noticeable increase in visits to pediatric clinics and emergency rooms.
Dr. Timur noted that, beyond Diyarbakır, data from many provinces, including Istanbul, indicates that rhinovirus and RSV are becoming increasingly common in children. This situation is expected, as RSV and rhinovirus typically emerge in late autumn and early winter, coinciding with or immediately following the flu wave. Increased encounters with these viruses are likely in the coming weeks, particularly among infants and school-aged children.
HEALTH SYSTEM STRAIN INCREASING
Dr. Yavuz Burak Tor also noted that they have begun to see RSV and rhinovirus more frequently in recent weeks. “Especially in some regions, the simultaneous circulation of these viruses with the flu is causing a greater number of illnesses to be felt. This is actually an expected picture seasonally, but this year, the fact that multiple viruses coincide is putting a strain on the health system,” he said.
