The discovery involves two adolescents in Santa Cruz and a boy in Buenos Aires with favorable development and no reported clinical complications.
12/19/2025 – 5:20 p.m
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The National Administration of Laboratories and Health Institutes (ANLIS) “Dr. Carlos G. Malbrán” confirmed the detection of three cases of influenza A(H3N2) subclass K in Argentina. According to available information, the infections are two teenagers from the province Holy Cross a child has already been admitted Autonomous City of Buenos Airesall of them suffer from the disease no clinical complications.
From the organization they stated that the Epidemiological surveillance remains active and within usual parameters for the season according to the records of the Infectious Diseases Diagnostic and Surveillance System.
Detection and surveillance of H3N2 influenza cases
The infections were identified and subsequently confirmed by the National Network of Laboratories and Sentinel Units INEI-ANLIS National Reference Laboratory, by Genome sequencing. This procedure allowed the detected viruses to be classified into subclass K, a variant that occurs genetic changes associated with greater transmissibility.
According to ANLIS himself, “Dr. Carlos G. Malbrán”, the scientific evidence available to date It does not demonstrate that this subclass causes more severe symptoms than those observed with other influenza A(H3N2) viruses that circulated in previous seasons.
The authorities reported on the development of the confirmed cases All three patients survived the infection without complications.. The child was hospitalized in the autonomous city of Buenos Aires required hospital treatmentwhile the Santa Cruz adolescents were examined as part of the Ambulatory Acute Respiratory Infection Surveillance Program.
Provincial health authorities remain responsible for the epidemiological investigation of each episode, in coordination with the national surveillance system, to ensure appropriate care and follow-up.
Epidemiological surveillance at national level
The monitoring of the Virus circulation in the countrywhich also includes influenza and other respiratory viruses, remains within expected levels for the period, the agency emphasized. Both the ANLIS “Dr. Carlos G. Malbrán” and the Directorate of Epidemiology of the Ministry of Health of the Nation accompany the surveillance tasks in the 24 jurisdictions with the aim of early detection of changes in transmission patterns, severity or in the affected populations.
Among the official recommendations is the importance of People with respiratory symptoms consistent with viral infections contact the health systemespecially those that integrate risk groupsto promote early detection and timely care.
Warning about the new flu: its symptoms and how it is spread
The circulation of H3N2 influenza K subclass It triggered health warnings in various parts of the world and also began to impact South America. The variant was first identified in Asia and then spread to Europe and North America higher transmission capacity than other seasonal varieties.
In the region, Peru, Chile and Bolivia The first infections associated with this subclass have already been confirmed. Infectologist Ricardo Teijeiro explained that it was expected that the variant would enter the country via travelers, but made this clear does not necessarily mean an outbreak in the southern hemisphereas certain conditions such as overcrowding and lack of ventilation must come together for this scenario.
Influenza A (H3N2) is one of the most common variants of the flu virus worldwide.. It is mainly transmitted through Respiratory droplets and through contact with contaminated surfaces. He Subclass Ktechnically known as J.2.4.1 is a genetic development of this subtype and is characterized by a increased risk of infectionAlthough without major clinical severity.
The associated symptoms do not differ from those of the seasonal flu and fever Sudden discharge, muscle pain, dry cough, nasal congestion, sore throat and severe general fatigue.
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