Figure 1.

SARS-CoV-2 cycle threshold values in asymptomatic, symptomatic, vaccinated, and unvaccinated individuals in California. SARS-CoV-2 reverse transcription polymerase chain reaction cycle threshold values for specimens from patients by vaccine status from Healthy Yolo Together (City of Davis and Yolo County, CA, USA) (A) and from specimens by vaccine and symptom status from Unidos en Salud (Mission District, San Francisco, CA, USA) (B). Box plots show first quartile, median, and third quartiles in the shaded region; diamonds indicate outliers beyond 1.5 times the interquartile range; P values were calculated with 2-sided t tests. Abbreviations: Ct, cycle threshold; SARS-CoV-2, severe acute respiratory syndrome coronavirus 2.