A viral Facebook post from woman in Carlsbad (San Diego County) has a lot of people vowing to never use bathroom hand dryers again.

Nichole Ward, a microbiology student, claims that she placed a petri dish under a hand dryer in a public bathroom for three minutes. After a few days, a disturbing amount of bacteria and fungi grew inside of the petri dish.

"DO NOT EVER dry your hands in those things again," Ward wrote on Facebook. "This is the several strains of possible pathogenic fungi and bacteria that you're swirling around your hands, and you think you're walking out with clean hands. You're welcome."

Ward's Facebook post has been shared over 560,000 times.

However, some accused Ward of fear-mongering since she and her microbiology class did not test whether the microorganisms are harmful to humans.

Dyson, the the manufacturer of the hand dryer used in Ward's experiment, told ABC News in a statement that the company was "unclear on the methodology employed."

"All Dyson Airblade hand dryers have HEPA filters that capture particles as small as bacteria from the washroom air before it leaves the machine," Dyson said. "Dyson Airblade hand dryers are proven hygienic by university research and are trusted by hospitals, food manufacturers and businesses worldwide."

There are number of conflicting studies regarding the spread of bacteria by bathroom hand dryers.

Some studies suggest that hand dryers spread more bacteria than paper towels do, while others suggest that hand dryers spread less bacteria or the same amount of bacteria as paper towels.