It is the underestimated epidemic, the one that is described as severe coldBut the behavior of the flu is unpredictable. Every year, this virus causes hundreds of hospitalizations and deaths among the elderly and vulnerable. Many end up suffering from illnesses stemming from pneumonia, respiratory failure, or exacerbations of chronic conditions such as diabetes. These are pathologies that could have been avoided or minimized by following preventive measures. This Tuesday, Catalonia officially entered the period of accelerated flu transmission: the number of cases has doubled, there are 35 hospitalized patients, and five of them are in serious condition. What to do now?