I think so, and if anything would work it would be a gas mask, but it has to be the proper size and properly fitted. Also, the filters have to be within their expiration date, and the filters only last a certain amount of time after they are removed from their packaging. Find out about this.
You can check for a proper fit by putting the mask on, adjusting it, then holding the intake valve(s) closed and inhaling. You should feel negative pressure (vacuum) inside the mask (i.e.: it will press against your face). Hold to make sure that there isn't a slow leak that would replace the vacuum with unfiltered air. If the vacuum holds, your mask is properly fitted. If the vacuum doesn't hold, readjust the mask on your face or take it off and put it back on and retest. You really should get training before depending on a gas mask. I was unable to find training materials on the web, but veterans of the military would be a good source for training on the use of a gas mask. Law-enforcement personnel would also be a good bet.
Dorothy Teeter, the interim leader of King County Public Health, says that gas masks are not recommended for use in healthcare settings by the CDC, but the unclassified 1980 Defense Intelligence Agency manual says that SHM masks of the type linked immediately below will protect against all known chemical, biological, and radiological agents. Some masks for sale in America are sold with filters for biological agents or filters for other agents. For protection against the flu, get filters for biological agents.
Here's an inexpensive gas mask for sale on the web (also in children's size).
Here are some more, some of which have voice-mitters, so you can talk while wearing them.
Check out the baby protective NBC hood.
Send questions or suggestions to: sean at fluviruspandemic dot info