Project Abstract Efforts to control the pandemic have resulted in widespread shelter-in-place orders. Transmission of SARS- CoV-2 occurs primarily through person-to-person contact and respiratory droplet transmission (Lai,2020). Household contacts of a person infected with SARS-CoV-2 are at a high risk for acquiring infection, with transmission rates ranging from approximately 10% to 15%. The majority of individuals who acquire infection from household contacts develop symptoms of COVID-19(Burke,2020) (Jing, 2020), (Bi,2020) (Li,2020b). Prophylaxis is urgently needed to reduce transmission rates and/or reduce the occurrence of symptomatic disease. Ideally, prophylaxis would need to be given as soon as possible after a known exposure, as the duration of time between symptomatic infection in the source individual and the development of symptoms in newly infected individual is thought to be approximately 5 days, with a possible range of 2 to14 days(Lauer,2020) (Li,2020a). Animal models suggest that SARS-CoV-2 RT-PCR in nasopharyngeal (NP) samples become positive within a few days after infection (Rockx,2020). An ideal agent for prophylaxis should be fast acting and highly effective and should protect against multiple viral variants. A monoclonal antibody (mAb) combination therapy, with two different monoclonal antibodies that bind distinct regions of the portion of the SARS-CoV-2 spike(S) protein that bind to and facilitate entry into host cells, has been developed in order to achieve these goals. A mAb combination against SARS-CoV-2 for post-exposure prophylaxis that can either prevent the development of disease or reduce viral acquisition or shedding could be key to reducing transmission of the virus and limiting symptoms and adverse outcomes following infection. Currently, however, there is no approved prophylaxis for COVID-19 nor for patients that are infected with SARS-CoV-2 but are asymptomatic. Given the speed at which this outbreak has spread and how it has impacted almost every community globally, there is an urgent need to develop safe and efficacious interventions to slow the spread of the SARS-CoV-2 virus and decrease adverse outcomes associated with symptomatic disease. This is a pivotal phase 3 randomized, double-blind, placebo-controlled study in adults with household contact exposure to individuals with SARS-CoV-2 infection in geographic areas with an active COVID-19 outbreak. This study is designed to assess the efficacy and safety of co-administered REGN10933+REGN10987 combination therapy (“REGN10933+REGN10987”) to reduce the proportion of SARS-CoV-2 infections and prevent the development of COVID-19 disease (symptomatic SARS-CoV2 infection), after household exposure to individuals with SARS-CoV-2 infection. Safety, tolerability, pharmacokinetics (PK), and immunogenicity of REGN10933+REGN10987 will also be evaluated.