Respiratory protection clarification

Respiratory protection.

Respiratory Protection for Nanoparticles

A. Nanoparticles are very small (nearly atomic scale) with diameters less than 100 nm (<0.1 micron) in at least one dimension. Because of their small size, air sampling results indicating low mass concentrations actually contain greater numbers and larger surface area/unit mass of nanoparticles than for the same mass concentration of larger particles. Also, nanoparticles may be more biologicall...

Respiratory protection against influenza.

Severe acute respiratory syndrome and respiratory protection.

To the Editor—Severe acute respiratory syndrome (SARS) emerged last year as a new infectious disease, as well as an occupational hazard for health care workers treating infected patients. The Centers for Disease Control and Prevention (CDC) recently drafted guidlines suggesting that routes of transmission of the SARS-associated coronavirus (CoV) involve the mucous membranes, such as the respira...

Clarification