The difference between a cold, flu, and corona Ramzani, head of the Association of Infectious Disease Experts in Israel, in an interview with Mizen: A cold usually has milder symptoms compared to the flu and Covid-19, and sometimes recovers within 3 to 5 days. However, the severity and duration of symptoms varies from person to person, and in some cases, the cough or feeling of weakness may last longer. Medical evaluation is needed in case of shortness of breath, chest pain, confusion, severe dehydration or persistent fever. It is best for infected people to avoid participating in school, the workplace and gatherings until recovery. More details Rate on social networks.