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Echinacea purpurea for prevention of experimental rhinovirus colds.
Sperber SJ, Shah LP, Gilbert RD, Ritchey TW, Monto AS. Sperber SJ, et al. Among authors: ritchey tw. Clin Infect Dis. 2004 May 15;38(10):1367-71. doi: 10.1086/386324. Epub 2004 Apr 26. Clin Infect Dis. 2004. PMID: 15156472 Free PMC article. Clinical Trial.