Exposure to large amounts of metallic mercury vapor, as opposed to the small amounts released from amalgam fillings, has occurred as a result of unprotected occupational exposure, school children handling and bringing home quantities of liquid mercury, broken medical devices, folk remedies, and use during religious or magical ceremonies. [6] Symptoms of such large exposures may include cough, fever, skin rashes, tremor, difficulty with muscle coordination and walking, kidney abnormalities, and memory loss.