Study shown wearing mask and handwashing reduce virus transmission

MedScape Medical News, December 6, 2007
Handwashing and wearing a mask are effective physical barriers to prevent the spread of respiratory tract virus infections, according to the results of a Cochrane review published Online First in the November 28 issue of the BMJ.
At the end of the article, it states:
“The use of handwashing, masks, gloves, and gowns alone or in combination to prevent the transmission of respiratory tract virus infections is associated with a 55% to 90% reduction in transmission.”

link: http://www.medscape.com/viewarticle/567044