The COVID-19 infection period varies from person to person. Most people with COVID-19 will have a mild illness and will recover in a few days. Generally, people with COVID-19 are considered infectious from 48 hours before symptoms start. In high-risk settings, they may be considered infectious from 72 hours before symptoms start. Symptoms in children and babies are milder than those in adults, and some infected kids may not show any signs of being unwell. People who experience more serious illness may take weeks to recover. Symptoms may continue for several weeks after infection. Some people may develop long-term health problems caused by COVID-19.