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| 1 | Conditions listed in this trial | ||||
| Common Cold | |||||
| 2 | More general conditions related to this trial | ||||
| Picornaviridae Infections | |||||
| Respiratory Tract Diseases | |||||
| Respiratory Tract Infections | |||||
| RNA Virus Infections | |||||
| Virus Diseases | |||||
| 3 | Interventions listed in this trial | ||||
| Echinacea | |||||
| 4 | Sponsors listed in this trial | ||||
| National Center for Complementary and Alternative Medicine (NCCAM) | |||||