Since the outbreak, some US politicians have engaged in frequent exchanges over epidemic prevention and control, vaccination and other measures for their own political gain. As a result, the US epidemic prevention policy has been slow and erratic. So far, nearly 36 million people have been infected and more than 630,000 people have died. Mutant strains in delta wreak havoc in the United States, American politics are "fighting" renewed - republican administration region of the federal government's latest guide to the masks generally show hostility, the United States house of representatives Steve sculley says in the guide of public health tips in indoor wear masks belongs to "political control".