Lindenmuth G F, Lindenmuth E B
Rest Haven-York, York College of Pennsylvania, USA.
J Altern Complement Med. 2000 Aug;6(4):327-34. doi: 10.1089/10755530050120691.
The aim of this study was to determine the efficacy of an echinacea compound herbal tea preparation (Echinacea Plus) given at early onset of cold or flu symptoms in a random assignment double-blind placebo-controlled study.
A total of 95 subjects with early symptoms of cold or flu (runny nose, scratchy throat, fever) were randomly assigned to receive Echinacea Plus tea five to six cups per day titrating to 1 over 5 days or placebo in a double-blind situation. Each participant completed a questionnaire 14 days after beginning the program. The efficacy, number of days the symptoms lasted, and number of days for change were measured with a self scoring questionnaire.
The study period was 90 days (January 1, 1999 to March 30, 1999). There was a significant difference between the experimental group (Echinacea Plus) and control group (placebo) for all 3 questions measured: p < 0.001. There were no negative effects reported by any of the subjects in either group.
Treatment with Echinacea Plus tea at early onset of cold or flu symptoms was effective for relieving these symptoms in a shorter period of time than a placebo.
本研究旨在通过一项随机双盲安慰剂对照试验，确定紫锥菊复合花草茶制剂（紫锥菊加）在感冒或流感症状初发时的疗效。
总共95名出现感冒或流感早期症状（流鼻涕、喉咙发痒、发烧）的受试者被随机分配，在双盲情况下每天饮用5至6杯紫锥菊加茶，持续5天，剂量逐渐减至1杯，或饮用安慰剂。每位参与者在开始该项目14天后填写一份问卷。通过一份自我评分问卷来衡量疗效、症状持续天数以及症状改变所需天数。
研究期为90天（1999年1月1日至1999年3月30日）。在所有三个测量问题上，实验组（紫锥菊加）和对照组（安慰剂）之间存在显著差异：p < 0.001。两组中均无受试者报告有负面影响。
在感冒或流感症状初发时饮用紫锥菊加茶进行治疗，比饮用安慰剂能更有效地在更短时间内缓解这些症状。
