No respiratory viruses were found on toilet surfaces.
Areas of the Helsinki-Vantaa airport - which saw nearly 19 million passengers in 2017 - were tested for viral contamination, with 90 surface samples and four air samples collected over a three-week period in 2016. The most common virus found was rhinovirus, which causes the common cold.
The researchers say the results make sense given that the security process is mandatory for all passengers and the plastic security trays are "rapidly recycled and potentially touched by several hundred passengers per day".
The results showed that different respiratory viruses were found in 10% of the samples, which included stair and escalator handrails, check-in kiosk touchscreens, toys in a children's play area, toilets, and of course, security trays.
The study made recommendations for stopping the spread of disease at airport security areas. They did not find these viruses at airport toilets.
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The report also commented on the dangers of spreading diseases domestically and internationally, stating: "They have the potential to be especially problematic if a severe pathogen with an indirect transmission mechanism were to pose a threat for worldwide spread".
"They have the potential to be especially problematic if a severe pathogen with an indirect transmission mechanism were to pose a threat for worldwide spread".
"Although this would not eliminate all viruses on hands, (e.g. alcohol gels have been found to be less effective than hand-washing for rhinovirus), it is effective for many viruses, including influenza", they added.
"This study supports the case for improved public awareness of how viral infections spread", said Jonathan Van Tam, professor of health protection at Nottingham University's School of Medicine.
"The presence of microbes in the environment of an airport has not been investigated previously", said Niina Ikonen, a virology expert at the Finnish institute, who was involved in the study.
Your best bet? Wash your hands as much as possible and keep the trusty hand sanitizer on standby.