Echinacea for prevention and treatment of upper respiratory infections.
D020900:Echinacea; D006801:Humans; D008517:Phytotherapy; D028321:Plant Preparations / Q000009:adverse effects / Q000302:isolation & purification / Q000627:therapeutic use*; D016032:Randomized Controlled Trials as Topic; D012141:Respiratory Tract Infections / Q000188:drug therapy* / Q000517:prevention & control*
D028321:Plant Preparations