Bathroom hot air hand dryers deposited large
quantities of bacteria on agar plates held beneath
the nozzles for 30 seconds and grew 15 to 60
bacterial colonies each, according to research
published in Applied and Environmental Microbiology,
a publication of the American Society for
The vast majority of the bacteria appear to come
from the bathrooms.
Bacteria deposited by hand dryers are skin flora
and/or environmental organisms that can cause
invasive human disease, including bloodstream,
ocular, and peritoneal infections.
In most cases, patients sickened by these bacteria
had a vulnerability to infection because of factors
such as a permanent catheter, an immunodeficiency,
chronic disease, or IV drug use.
For more information
Applied and Environmental Microbiology
Deposition of Bacteria and Bacterial Spores by
Bathroom Hot Air Hand Dryers