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.

Most Brazilian states report severe acute respiratory syndrome (SRAG) at alert, risk, or high-risk levels, according to Fiocruz's InfoGripe bulletin released on April 29. Cases are driven mainly by influenza A and respiratory syncytial virus (RSV), which circulate more in autumn and winter. Exceptions are Rio de Janeiro, São Paulo, and Rio Grande do Sul.

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A Western Cape resident who showed flu-like symptoms after possible exposure to a hantavirus patient has tested negative. South African health authorities are monitoring 97 close contacts following an outbreak on the cruise ship MV Hondius.

Flu cases are rising in Hong Kong, particularly among children and the elderly, an expert warned on Saturday. Professor Ivan Hung Fan-ngai said waning immunity from vaccines is contributing to the increase. He urged high-risk groups to get vaccinated.

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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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