… There are warning signs and symptoms to watch out for in adults and children, such as trouble breathing, a fever that won't go away, or a fever that returns after you start to feel better. … very similar to those of COVID-19. Emergency warning signs and symptoms in adults Difficulty breathing or shortness of breath Pain or pressure in the chest or abdomen Sudden dizziness … Kidney failure Liver disease Emergency warning signs and symptoms in children and infants Fast breathing or trouble breathing Bluish skin color Not drinking enough fluids Not waking up or not …