Thursday, March 17, 2011
Los Angeles: If the presence of all those alcohol-based hand sanitisers makes you feel safe from disease, read no further.
The sanitisers — Purell, Germ-X and the like — started popping up everywhere last year after the outbreak of the H1N1 "swine flu" virus. But new research out of the University of Virginia finds that they are of no particular use in warding off the flu. They also failed to ward off rhinovirus, a major cause of the common cold.
The researchers, led by Dr Ronald B. Turner, tested the sanitisers in real-world conditions. They asked 116 volunteers to carry around a sanitiser with "enhanced antiviral activity" and use it every three hours while they were awake. Another group of 96 volunteers followed their usual routines.
Researchers tracked them for 10 weeks, collecting specimens once a week to test for flu and rhinovirus. Additional samples were taken whenever a study participant complained of cold or flu-like symptoms.
It turned out that sanitiser users developed 12 flu infections per 100 volunteers, compared with 15 cases of flu per 100 volunteers in the group that didn't do anything special. In addition, there were 42 cases of rhinovirus per 100 volunteers among the sanitiser users, versus 51 for the control group. Neither difference was statistically significant.
The researchers surmise that hand transmission is less important for these viruses than previously thought. Perhaps public health officials should pay more attention to how these viruses spread through the air, they said.
Previously, Turner and colleagues had established that alcohol-based sanitisers removed rhinovirus from hands better than soap and water.
The results were presented on Sunday at the annual meeting of the Interscience Conference on Antimicrobial Agents and Chemotherapy in Boston. The study was funded by the Dial Corp, which makes hand sanitisers and old-school soap.
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