Panther Labs KetoIt means? This means that diseases such as the flu and angina, as well as scarlet fever or herpes labialis, can be infected through objects touched by a sick person. Bacteria and viruses that cause them can survive from a dozen or so hours on porous surfaces, up to even 24 hours on smooth surfaces, such as door handles, handrails, countertops, light switches, etc. during the travel. Guess where, according to recent studies, the most pathogenic microorganisms are on board?