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The flu is a respiratory illness caused by influenza viruses that infect the nose, throat and lungs â but its effects can be felt through the whole body. The flu is a highly contagious viral infection of the respiratory tract. The symptoms of flu and colds are similar, but flu symptoms come on suddenly, Flu Symptoms.
One to three days after contracting a cold virus, symptoms start and include: runny nose, congestion, sneezing, scratchy throat and cough, and reduced sense of taste and smell. Young children may develop a fever.