The CDC's Morbidity and Mortality Weekly Reports (MMWRs) are authored by career scientists and serve as the main vehicle for the agency to inform doctors, researchers and the general public about how Covid-19 is spreading and who is at risk. Such reports have historically been published with little fanfare and no political interference, said several longtime health department officials, and have been viewed as a cornerstone of the nation's public health work for decades. But since Michael Caputo, a former Trump campaign official with no medical or scientific background, was installed in April as the Health and Human Services department's new spokesperson, there have been substantial efforts to align the reports with Trump's statements, including the president's claims that fears about the outbreak are overstated, or stop the reports altogether.