The principal mode by which people are infected with SARS-CoV-2 (the virus that causes COVID-19) is through exposure to respiratory droplets carrying infectious virus. Most infections are spread through close contact, not airborne transmission.… read more »
CDC is conducting seroprevalence surveys called “large-scale geographic seroprevalence surveys†in locations across the United States. The first seroprevalence surveys began in areas that first reported community transmission of SARS-CoV-2 in the United States; they are now being expanded to more regions. Descriptions of these surveys are provided on this page.… read more »