Table 1. Clinical spectrum of SARS-CoV–positive cases and SARS antibody titers*.

Classification	No. (%)	Median titer (range)
Pneumonic SARS	37 (82.2)	1:6,400 (1:1,600–1:6,400)
Subclinical (nonpneumonic) SARS	2 (4.4)	1:4,000 (1:1,600–1:6,400)
Asymptomatic SARS	6 (13.3)	1:4,000 (1:400–1:6,400)

*SARS, severe acute respiratory syndrome. CoV, coronavirus.