Incubation period is 24-48 hours. Can affect most ages, especially infants. The viruses spread by personal contact or indirect contact. Signs and Symptoms Chills. Moderate to high fever.
Muscle aches, including backache.
Cough, usually with little or no sputum. Risk Factors Stress. Recent illness that causes lowered resistance. Chronic illness, especially chronic lung or heart disease. Students due to close proximity to others in classrooms.