. 2022 Jul 11;12(7):e057281. doi: 10.1136/bmjopen-2021-057281

Table 5.

Classification statistics of contacts of variant virus infected person i

Whether infected	Whether observed by epidemic investigation	Contact number (tp)	Number of unvaccinated (tpn)	Number of vaccinated (tpm)	Number of completed vaccination (tpf)
Yes	Yes	${t p y}_{i}^{1}$	${t p n y}_{i}^{1}$	${t p m y}_{i}^{1}$	${t p f y}_{i}^{1}$
	No	${t p y}_{i}^{0}$	${t p n y}_{i}^{0}$	${t p m y}_{i}^{0}$	${t p f y}_{i}^{0}$
No	Yes	${t p n}_{i}^{1}$	${t p n n}_{i}^{1}$	${t p m n}_{i}^{1}$	${t p f n}_{i}^{1}$
	No	${t p n}_{i}^{0}$	${t p n n}_{i}^{0}$	${t p m n}_{i}^{0}$	${t p f n}_{i}^{0}$