Few people in underground Frankfurt metro station waiting for subway train to arrive, Germany, covid-19 quarantine, static

few people underground frankfurt metro station wait subway train arrive germany covid19 quarantine static face mask mask pandemic transportation travel coronavirus health covid 19 medical adult corona virus 2019ncov epidemic flu influenza safety contagious threat mers physically apart infection control minimize out break hygiene outbreak protection disease virus stop the spread physical distancing social distancing prevent empty desert concern