hand writes stay home hastags or slogans for anti virus protection to prevent corona covid-19 infection on a green chalkboard

19 2019 2019ncov advertising aid anti blackboard care chalk chalkboard china corona coronavirus covid covid19 disease epidemic europe fever ffp2 ffp3 flu germany green hand hastags health home hospital hygiene ideal infection layouts lessons magazines mask medical mokupsn or outbreak prevent print protection quarantine safe sars sarscov2 school seminar slogans sneezing stay symbol teacher transmission university virus websites woman worker writes wuhan