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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クルーズ船「MVホンディウス」でハンタウイルス感染症が発生

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世界保健機関(WHO)は月曜日、クルーズ船「MVホンディウス」に関連してアンデスウイルスによるハンタウイルス感染症の症例が9件確認されたと報告しました。そのうち7件は確定診断されています。同船は先週末にスペインのテネリフェ島に到着し、90名以上の乗客が健康観察下で下船させられました。

The Ministry of Health issued an epidemiological alert due to the unusual rise in Influenza B cases during the current period, according to the weekly Winter Campaign 2026 report.

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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.

Brazil recorded seven cases of hantavirus infection in 2026 through April, with one death. The disease, endemic in rural areas, maintains a fatality rate of around 40%.

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Spain's Health Ministry has identified a possible hantavirus case in a woman living in Alicante. The patient, who traveled on a flight with one of the victims from the MV Hondius cruise outbreak, shows compatible symptoms and has been isolated.

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