It may be a matter of bad timing, so that if a child is exposed to an allergen at the same time as a lower respiratory virus infection, then the child might become sensitised to that allergen instead of being tolerant of it.

• 这可能是由于不良的时机造成的，也就是说如果小孩在得下呼吸道病毒感染的时候正好暴露于某一过敏原，那么他不但不会对其耐受，反而是产生了过敏。