Over the next six days, the volunteers reported on any aches, pains, sneezing or congestion they had, while the researchers collected objective data, like daily mucus production.

• 在接下来的六天里，实验对象要每天报告自己是否出现头痛、喷嚏或鼻塞等症状，研究人员则收集实验对象的“日鼻涕量”等观察数据。