Table 1.

Demographic characteristics in individuals from Omicron variant infections

Characteristic		Number	(%)
Reported sex	Female	20	62.5%
	Male	12	37.5%
Age	14–63	32	NA
COVID-19 vaccination	Vaccinees	19	59.4%
	Unvaccinated individuals	13	40.6%
	Total	32	NA

The table includes all individuals infected by BA.2 (n = 32) for which the serum samples from them were collected from 1 to 27 days after symptom onset