Purchasing reusable respirators also may reduce or eliminate the impact of potential shortages of filtering facepiece respirators and may be more cost effective over the duration of the pandemic.

• 购买可更换式呼吸器不仅可以降低或消除随弃式呼吸防护口罩因货源不足造成的潜在影响，而且在流感爆发期间使用时还会更经济。