Face Masks and Hand Hygiene Can Help Limit Spread

Face Masks and Hand Hygiene Can Help Limit Spread

In an influenza pandemic, vaccination may not be initially available, and antiviral prescribing may be limited, which is why scientists need to understand how effective other measures are in preventing influenza.

For the study, researchers from the University of Michigan School of Public Health, led by Allison E. Aiello, recruited more than 1,400 college students living in university residence halls during the 2006-2007 influenza season. Participants were assigned to one of three groups: those who wore face masks, those who wore masks and used alcohol-based hand sanitizer, or a control group who received no intervention. Students were monitored for influenza-like symptoms for six weeks. All participants viewed a basic hand hygiene instructional video. Subjects in the hand hygiene and mask group were given an alcohol-based hand sanitizer and written instructions regarding proper face mask and hand sanitizer use. Those in the mask group received written instructions on face mask use only. The students began using the measures just after laboratory confirmation of influenza on the University of Michigan campus had been made.

The investigators observed significant reductions in the incidence of influenza-like symptoms starting after three weeks in the hand sanitizer/mask group and in the mask group compared with the control group. In the hand sanitizer/mask group, Aiello and researchers found a reduction of influenza-like symptoms ranging from 35 to 51 percent when compared with the control group. The incidence of symptoms between the hand sanitizer/mask group and the mask-only group were not statistically different, suggesting that the use of hand sanitizer did not substantially contribute to reducing symptoms.

The findings “have implications for guidelines and recommendations for mask use in the community setting,” the authors wrote. Mask use during this study was proven to have a protective effect even when worn moderately during the day. Additionally, the use of face masks and hand hygiene may reduce respiratory illnesses in community settings and lessen the impact of the H1N1 pandemic, the authors noted.

MEDICA.de; Source: Infectious Diseases Society of America

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