Broumand N., L. Stahl, and JG Tilles.  “In Vitro Effects of Echinacea and Ginseng on Natural Killer and Antibody-Dependent Cell Cytotoxicity in Healthy Subjects and Chronic Fatigue Syndrome or Acquired Immunodeficiency Syndrome Patients.”  Immunopharmacology  Jan. 1997: 229-35.

Burger, RA, et al.  “Echinacea-Induced Cytokine Production by Human Macrophages.”  International Journal of Immunopharmacology  Jul. 1997:  371-9.

Luettig, C., et al.  “Macrophage Activation by the Polysaccharide Arabinogalactan Isolated from Plant Cell Cultures of Echinacea purpurea.” Journal of the National Cancer Institute  May 1989:  669-675.

Mack, Ronald.  “A Bunch of Boys Were Whooping it Up.”  North Carolina Medical Journal   Jul.  1998: 236-237.

Melchard, D.  “Results of Five Randomized Studies on the Immunomodulatory Activity of Preparations of Echinacea.”  Journal of Alternate Complement Medicine  Jun.  1995:  145-60.

Mengs, U.  “Toxicity of Echinacea purpurea.” Arzneimittelforshung  Oct.  1991:  1076-81.

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