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Peru Confirms Six H3N2 Subclade K Cases as Argentina Sets Antiviral Guidance

Officials emphasize early antiviral treatment alongside vaccination for people at higher risk.

Switzerland Roche Tamiflu - Undated photo provided by Swiss company Roche on Tuesday, April 28, 2009 shows blister strips containing Tamiflu capsules in the Roche packaging facility in Kaiseraugst, Switzerland. Swiss drug company Roche Holding AG said WHO has enough of the firm's anti-flu Tamiflu stockpiled to treat up to 5 million people who come down with the new strain of swine flu. (AP Photo/Roche) ** MANDATORY CREDIT EDITORIAL l USE ONLY ** kaiseraugst suiza laboratorio roche blister pastilla tamiflu epidemia de gripe porcina medicacion
Minsa anuncia llegada anticipada de nuevas vacunas contra la influenza para febrero de 2026
El titular del sector explicó que los casos identificados corresponden al subclado K del virus influenza H3N2 y han sido confirmados mediante pruebas oficiales. (Fuente: CDC Perú)
El Ministerio de Salud lanzo recomendaciones ante el broted e la Gripe A H3N2.

Overview

  • Peru’s health minister said six H3N2 subclade K infections have been confirmed and announced influenza vaccine shipments brought forward to the first half of February 2026 after talks with PAHO.
  • Argentina’s Malbrán institute confirmed three local H3N2 subclade K cases and the Health Ministry advised using oseltamivir as a complement to vaccination in eligible patients.
  • Guidance notes oseltamivir works best within 48 hours of symptom onset, with evidence of benefit in severe cases even when started later, and clinicians should not wait for lab confirmation to begin treatment when warranted.
  • Authorities warn against indiscriminate antiviral use to prevent resistance, reporting no increase in oseltamivir‑resistant strains among circulating viruses in Argentina during 2024.
  • National updates come as the subclade K strain is detected across the region, with recent identifications in Brazil, Costa Rica, Chile, Mexico, and rising detections reported in the United States and Canada.