H3N2 K subclade flu spreads in South America, Argentina heightens surveillance

Following initial alerts in Europe and the US, the H3N2 influenza 'subclade K' variant is now advancing in Chile, Peru, and Colombia, prompting Argentina to analyze local samples amid concerns of higher infection and hospitalization risks.

The H3N2 K subclade, previously driving hospitalizations in Europe and the US, has been confirmed circulating in neighboring South American countries including Chile, Peru, and Colombia. This development has placed Argentine health authorities on high alert, as the variant is associated with elevated infection and hospitalization rates compared to prior strains.

The National Institute of Infectious Diseases Malbrán is actively testing local influenza samples to detect any presence in Argentina, a critical step for gauging national impact.

With symptoms akin to seasonal flu but potentially more severe in vulnerable populations, health officials reiterate standard precautions: vaccination, masks in crowded areas, hand hygiene, and isolation from symptomatic individuals. Prompt medical consultation is urged for flu-like illnesses.

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MV Hondius cruise ship at Tenerife with health officials evacuating passengers amid hantavirus concerns
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Hantavirus cases reported on MV Hondius cruise ship

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The World Health Organization reported on Monday nine cases of Andes virus hantavirus linked to the MV Hondius cruise ship, with seven confirmed. The vessel arrived in Spain's Tenerife last weekend, where over 90 passengers were evacuated under health supervision.

Chile's National Service for Disaster Prevention and Response (Senapred) has declared a preventive early alert in the Araucanía Region after detecting highly pathogenic H5N1 avian influenza in backyard birds in Reinaco commune. The measure addresses a zoosanitary risk reported by the Agricultural and Livestock Service (SAG), amid a national emergency. The virus has now reached five regions.

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Chile's Agricultural and Livestock Service (SAG) detected a highly pathogenic H5N1 avian influenza case in backyard birds in Bollenar sector, Melipilla commune, Metropolitan Region. The virus was lab-confirmed after reports of domestic bird deaths. The country retains its sanitary status free of the disease in commercial flocks.

Scientists in Brazil and Peru are using machine learning for early outbreak predictions and Wolbachia-infected mosquitoes to curb dengue fever, amid rising cases fueled by climate change. In Lima, a 2024 epidemic overwhelmed hospitals, prompting adaptations now informing regional strategies. These efforts offer models as subtropical U.S. areas report local transmissions.

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Chile's flu vaccination campaign has reached 61.2% progress, exceeding the April target, but with low coverage in children, seniors, and pregnant women. Public Health Undersecretary Alejandra Pizarro urged reaching 70% in May. Over 6 million doses have been administered at more than 1,700 free sites.

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