More than 200 viruses can cause a cold, but rhinoviruses are the most common type. Viruses that cause colds can spread from person to person through the air and close personal contact.
Symptoms of a cold usually peak within 2 to 3 days and can include:
-Mucus dripping down your throat (post-nasal drip)
-Fever (although most people with colds do not have fever)
WHEN TO SEEK MEDICAL CARE?
See a doctor right away if your child is younger than 3 months old and has a fever of 100.4 °F (38 °C) or higher.
-Difficulty breathing or fast breathing
-Fever that lasts longer than 4 days
-Symptoms that last more than 10 days without improvement
-Symptoms, such as fever or cough, that improve but then return or worsen
-Worsening of chronic medical conditions
Content source: Centers for Disease Control and Prevention, National Center for Emerging and Zoonotic Infectious Diseases (NCEZID), Division of Healthcare Quality Promotion (DHQP)