Study Finds Airport Security Trays Carry Germs For Cold And Flu : Short Wave Hint: it's not the bathroom. Niina Ikonen and Carita Savolainen-Kopra from the Finnish Institute for Health and Welfare studied high-traffic areas in the Helsinki airport to identify where germs were most prevalent. Also, tips on how to stay healthy during your holiday travel. Here's their original paper in the journal BMC Infectious Diseases. Follow host Maddie Sofia on Twitter @maddie_sofia. Email the show at email@example.com.