Popular article:

Karasz, Palko. “Airport Security Trays Carry More Cold Germs Than Toilets, Study Finds,” New York Times. Sep. 5, 2018. https://www.nytimes.com/2018/09/05/world/europe/airport-security-trays-virus.html

Primary Source:

Ikonen, Niina et al. “Deposition of Respiratory Virus Pathogens on Frequently Touched Surfaces at Airports.” BMC Infectious Diseases 18, no. 1 (2018). doi:10.1186/s12879-018-3150-5.