Russian physician warns cold-like infections can occur in summer heat

A Russian physician has cautioned that colds and viral infections can still occur during the summer months, with sudden temperature changes raising the risk of illness. Dr. Svetlana Burnatskaya, a physician working in Russia, said moving directly from outdoor heat of 35°C to air-conditioned interiors set at 18–20°C forces the body to adapt quickly. She noted that while cold air alone is not a source of viruses, it weakens the protective mucous membranes in the nose and throat, making it easier for viruses to enter the body. The same effect can be triggered by drinking excessively cold beverages in hot weather, swimming in cold water after prolonged heat exposure, or sitting directly in the path of strong air-conditioning currents, according to Burnatskaya. She added that air-conditioning units are not sources of viruses if properly maintained, but dirty filters can spread dust, allergens and certain microorganisms. The physician also pointed out that the dry air produced by air conditioners dries out the mucous membranes of the respiratory tract, increasing susceptibility to viral infections. Other health specialists have noted that prolonged exposure to high temperatures can negatively affect cardiovascular health, potentially reducing immune system efficiency and raising the risk of illness and viral infection.