Analysis of lymphocytes and subsets.

*1 severely ill patient was not assessed at enrolment. **The day post-onset for follow-up assessments was 35 (31–47) for mild patients and 34 (31–37) for severe patients.* 1例重症患者在入组时未接受评估。 ** 轻症患者的随访评估对应的发病后天数为35（31~47），重症患者为34（31~37）。