text sign showing negative cases. conceptual photo circumstances or conditions that are confurmed to be false grids and

2019ncov blood case confute contradict controvert corona coronavirus covid19 debunk deny disaffirm disallow disavow disclaim disconfirm discredit disease disown disprove epidemic gainsay infection invalidate lab laboratory mers ncov negate negative oppose pandemic patient pneumonia rebut refute reject repudiate test virus