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Common colds and influenza are contagious infections that affect the respiratory system. Both are airborne illnesses, spread through coughing and sneezing. Shared symptoms include headache, cough, sore throat, and more.
A salivary gland infection occurs when a bacterial or viral infection affects your salivary gland or duct. The condition is called sialadenitis.
A gram stain is a test used to learn if bacteria are present in your body fluids or tissue. Learn what it involves and when your doctor might order it.