A group of Canadian researchers has documented a doubling of pollen levels across the country in recent years, a trend they attribute directly to climate change. Daniel Coates, director of Aerobiology Research Laboratories, noted that warmer temperatures extend the growing season, allowing plants to release more pollen for longer periods. “It’s getting worse because pollen loves warm weather,” he said, adding that unpredictable spring conditions in 2026 have further intensified the allergy season. The finding underscores a global phenomenon: as temperatures rise, respiratory allergies are becoming more severe and widespread, placing an additional burden on health systems already stretched by seasonal viruses.

Viewed from Buenos Aires, the picture is equally complex but for different reasons. Argentine health experts are grappling with a confluence of winter respiratory infections — influenza, COVID-19, and the common cold — alongside vector-borne diseases like dengue and chikungunya, as well as hantavirus transmitted by rodents. Dr. Daniel López Rosetti explained that cold weather weakens the body’s defences, making people more susceptible to viruses such as rhinovirus, while also triggering allergic reactions. The challenge, analysts in London note, is that early symptoms of these conditions — nasal congestion, sore throat, cough, and fatigue — are nearly identical, making accurate diagnosis difficult without travel history or laboratory testing.

In Argentina, where an estimated eight million people suffer from allergies, cardiologist Jorge Tartaglione highlighted that one in five of those patients has allergic rhinitis. “The nose becomes a waterfall,” he said, describing the reaction to cold air and environmental triggers. He emphasised that allergies are an exaggerated immune response, often mistaken for a cold. Meanwhile, a guide published by Argentine health authorities stresses that the intensity of pain and recent travel history are key differentiators: dengue typically causes severe joint and muscle pain, while hantavirus leads to respiratory distress and requires immediate medical attention to reduce mortality.

The convergence of these trends — rising pollen due to climate change in North America and overlapping viral and allergic symptoms in South America — points to a growing need for public health strategies that address both environmental and infectious threats. As seasons become more unpredictable and pathogens circulate simultaneously, health systems must invest in rapid diagnostics and public education. The ability to distinguish a cold from an allergy, or a mild flu from hantavirus, may soon become as critical as forecasting pollen counts. Without such adaptation, the burden on primary care will only deepen.