Table 1. Timeline from return to China by 2 persons with presymptomatic SARS-CoV-2 infection to results of environmental sampling of their rooms at a centralized quarantine hotel, 2020*.

Characteristic	Patient A	Patient B
Date returned to China	19 Mar	20 Mar
Date entered quarantine	19 Mar	21 Mar
Date of SARS-CoV-2 RNA–positive detection	20 Mar	22 Mar
Date of environmental surface sampling	20 Mar	22 Mar
Symptoms at hospital admission	None	None
Ct for clinical samples at admission†
Nasopharyngeal swab	24.72	27.87
Sputum	28.61	23.23
Fecal swab	33.12	NA
Symptoms during hospitalization	Fever, chills, cough	Fever, cough, sputum, sore throat
Disease severity	Mild	Moderate

*C_t, cycle threshold; NA, not available; rRT-PCR, real-time reverse transcription PCR; SARS-CoV-2, severe acute respiratory syndrome coronavirus 2.
†A lower C_t indicates a higher viral load. Only C_t values for open reading frame1ab (ORFab1) gene of SARS-CoV-2 were provided in the table because the Ct values for nucleoprotein were similar to values of ORFab1.