April 3, 2020 — CDC Face Mask Order
On April 3, 2020, the CDC announced that everyone should wear face masks, wash their hands, and clean surfaces in order to prevent the spread of Covid-19.
CDC 4/3/20: Wear Masks To Fight Covid
On April 3, 2020, the CDC advised "Everyone should wear a cloth face cover when they have to go out in public, for example to the grocery store or to pick up other necessities." Private and governmental policies across the US and internationally were crafted according to this statement.
CDC 4/3/20: Wash Hands To Fight Covid
On April 3, 2020, the CDC advised "Wash your hands often with soap and water for at least 20 seconds especially after you have been in a public place, or after blowing your nose, coughing, or sneezing."
CDC 4/3/20: Clean Surfaces To Fight Covid
On April 3, 2020, the CDC advised "Clean AND disinfect frequently touched surfaces daily. This includes tables, doorknobs, light switches, countertops, handles, desks, phones, keyboards, toilets, faucets, and sinks."
May 2020 — Researchers Prove the Opposite
May 2020, Dr. Jingyi Xiao, an epidemiologist from the University of Hong Kong, and her colleagues, ran a paper entitled "Nonpharmaceutical Measures for Pandemic Influenza in Nonhealthcare Settings—Personal Protective and Environmental Measures" at Emerging Infectious Diseases, in which they sought to separate myth from reality and to demonstrate what data-driven measures can be helpful in preventing the spread of Covid-19. Xiao's research showed the opposite of the April 3, 2020, statements from the CDC to be true.