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Influenza A Outbreak in Santa Fe: 44% of Hospitalized Patients Are Children

13/06/2026 16:19 - Salud

Santa Fe vacunación salud infantil influenza H3N2 gripe A

Infografía médica profesional sobre prevención de influenza A H3N2 en población infantil, con pediatra examinando a niño, vacunas y elementos de protección sanitaria

Understanding the Influenza A Crisis in Argentina's Santa Fe Province

Santa Fe, one of Argentina's most populous provinces located in the central-eastern region of the country, is facing a concerning epidemiological situation. Influenza A H3N2 represents 98% of respiratory virus cases detected across Argentina, with a disproportionate impact on the pediatric population.

Key Epidemiological Data

Indicator	Value
Outpatient surveillance positivity rate	57.4%
New hospitalizations (last week)	222 cases
Influenza-like illness cases (Jan-May 2025)	357,133
Pneumonia cases	45,442
Bronchiolitis cases (under 2 years)	31,248
Influenza-related deaths (2025)	10

Why Children Are Most Affected

According to Argentina's National Epidemiological Bulletin N° 811, published by the Ministry of Health, children under 14 account for 123 of the 278 hospitalized influenza A patients, representing 44.2% of total hospitalizations. The most affected age group is 5 to 9 years old, with 35 confirmed hospitalizations.

What is Influenza A H3N2?

H3N2 is a subtype of the influenza A virus known for causing more severe illness, particularly in children, older adults, and people with pre-existing conditions. Symptoms include high fever, dry cough, intense muscle pain, and fatigue. The H3N2 strain has greater mutation capability than other variants, making natural immunity less effective and emphasizing the importance of annual vaccination.

About Santa Fe Province

Santa Fe is Argentina's ninth-largest province by area and third-most populous, with over 3.5 million residents. Its capital city, also named Santa Fe, is an important educational and cultural center. The province is known for its agricultural production and numerous universities, which may contribute to virus transmission in educational settings.

Seasonal Context

Argentina is located in the Southern Hemisphere, meaning its winter runs from June to September. The current outbreak coincides with the onset of colder weather, when respiratory viruses typically surge. Influenza season in Argentina usually peaks between May and August, making timely vaccination crucial.

Official Recommendations

Argentina's health authorities emphasize the following measures:

Timely vaccination for the entire population, especially high-risk groups including children, pregnant women, adults over 65, and people with chronic conditions
Antiviral treatment with oseltamivir within the first 24-36 hours of symptom onset for suspected cases
Seek immediate medical attention if experiencing breathing difficulties, persistent fever, or general deterioration
Preventive measures: frequent handwashing, adequate ventilation in enclosed spaces, and mask use in crowded areas

Current Epidemiological Landscape

While SARS-CoV-2 (COVID-19) and respiratory syncytial virus (RSV) remain at low circulation levels, Influenza A H3N2 currently dominates respiratory virus transmission in Argentina. This represents a notable shift from recent years when COVID-19 was the primary epidemiological concern.

Source: National Epidemiological Bulletin N° 811 - Ministry of Health of Argentina. Data reflects surveillance through epidemiological week 21 of 2025.