german text `schule geschlossen` at green chalkboard, blackboard texture with copy space hangs on red grunge wall and wooden flo

2019ncov 3dillustration billboard biohazard blackboard chalk chalkboard china chinese classroom closed college commercial communication concept contagion copy coronaviridae coronavirus course disease education elementary epidemic floor flu german geschlossen green grunge gym hangs health illness illustration influenza lesson medical message ncov novel outbreak pneumonia protective red reminder sars sarscov2 school schooling schule space study syndrome teacher text texture university vaccine virus wall wooden wuhan