IgA and IgM are early indicators of viral exposure and can aid in the diagnosis of COVID-19. They can take 3-7 days to form after initial exposure. IgG, by contrast, typically takes 10-14 days to form after initial exposure and may indicate a prior infection which may be resolved or is still resolving, and/or protection against reinfection (“protective immunity”). At this time, Sonora Quest is focusing its efforts on IgG antibody testing only. Our focus on IgG will enable Sonora Quest to provide antibody testing that provides insights into an individual’s prior exposure to COVID-19 and the potential for protective immunity, which ultimately may help identify people who may be able to resume work and other daily activities in society.