Chile Faces Unusual Surge in Respiratory Viruses Amid Warm Spring and Allergy Season
Despite being typically associated with colder months, respiratory viruses are circulating at high levels in Chile, coinciding with a rise in seasonal allergies and one of the warmest springs in the last five years. This unusual combination is driving a significant increase in consultations for respiratory symptoms, raising concerns among health specialists.
According to recent reports from the Institute of Public Health (ISP), positivity rates for respiratory illnesses have remained above 50% in recent weeks. Experts warn that the inflammation caused by allergies weakens the body’s natural defenses, making individuals more susceptible to viral infections.
Allergy-Virus Connection Fuels Concerns
The simultaneous presence of respiratory viruses and allergies is creating a challenging situation for Chilean healthcare providers. “This inflammation that produces allergies makes it much easier for a virus to enter, because this barrier defense is altered,” one specialist explained. This vulnerability is particularly pronounced during the spring season, when allergy symptoms are often at their peak.
Ignacio Rodriguez, a researcher at the Clinical Research Center of the San Sebastián University, noted that individuals with allergies are generally more prone to catching colds, both in winter and spring. He further highlighted an unexpected trend: “Another important thing is that this year, 2025, we’ve seen a very significant increase in the circulation of respiratory viruses in November, which is strange, because generally in Chile respiratory viruses circulate in winter.” This year’s surge includes a high prevalence of influenza and rhinovirus, the common cold virus.
COVID-19 Remains Present, Vaccination Key
While SARS-CoV-2 continues to circulate in Chile, its prevalence is lower compared to other respiratory viruses, particularly during the winter months. Alexis Kalergis, director of the Millennium Institute of Immunology and Immunotherapy, attributes this decline to widespread vaccination efforts.
“Vaccination has allowed us to generate protective immunity in the population and achieve herd immunity,” Kalergis stated. However, he emphasized the importance of ongoing vaccination campaigns, particularly for risk groups identified by the Ministry of Health (Minsal). “It is important that the risk groups and those that the Minsal determines are included in the vaccination campaigns to reinforce this collective immunity.” He also cautioned that the virus continues to evolve, with currently circulating variants derived from the Omicron variant.
Proactive Allergy Management Recommended
Given the current scenario, health professionals are urging individuals to proactively manage their seasonal allergies. Treating allergies can help reduce inflammation and minimize the risk of exacerbating symptoms caused by respiratory viruses.
This confluence of factors presents a unique public health challenge for Chile, requiring continued vigilance, proactive healthcare measures, and ongoing research to understand the evolving dynamics of respiratory illnesses.
