Both influenza and flu cause infection in the respiratory system leading to more or less the same symptoms. As per the World Health Organisation (WHO) an individual can suffer from both the infections at the same time and share identical symptoms like sore throat, cough, runny nose, fever, headaches and fatigue. The severity of the condition depends from person to person. Some may have mild symptoms, while others may experience severe signs. But both conditions can be fatal if not treated on time. In COVID a person may experience loss of taste and smell, which is not associated with flu. Even the post-infection complications witnessed in the case of COVID are missing when infected by the influenza virus.