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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.
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.