Plastic mattress covers help keep dander out of beds, and room air cleaners equipped with high efficiency particulate air (HEPA) filters can remove dander from the air.

CNN: What to do if you're allergic to your pet

High Efficiency Particulate Air (HEPA) filters, which usually last a year.

CNN: Your own clean-air act

To minimize the risk of disease spread by aircraft, regulations requiring HEPA filters for any aircraft that uses recirculated air should be seriously considered.

CNN: Commentary: Flu and your health on a plane

The recirculated air usually passes through high-efficiency particulate (HEPA) filters before delivery into the cabin.

CNN: Commentary: Flu and your health on a plane