Viruses don't take vacations. "They're present all year round, but the protagonist changes depending on the temperature and the climate," explains Fran Fernández Segura, family doctor at the CAP la Paz in Barcelona. Viruses are not, therefore, exclusive to winter. And the most common in the respiratory system are enteroviruses and rhinoviruses. The coronavirus also circulates. "It's true that summer climatic factors aren't the most suitable for them to survive, but viruses do," he adds.