Table 3.

MuCV effectiveness by vaccine type and interval since vaccination among 1 dose MuCV students in a mumps outbreak in Anhui province, China, 2014–2015.

Vaccine type	Years since vaccination	Cases	Exposed persons	AR (％)	RR (95%CI)	VE (％,95％CI)
Un-vaccinated		93	530	17.5	Ref	Ref
Monovalent mumps vaccine	≤5 years	3	11	17.3	1.55(0.58,4.15)	0(-315,-42)
	>5 years	51	375	13.6	0.78(0.57,1.06)	22(0,43)
MM	≤5 years	2	11	18.2	1.04(0.29,3.68)	0(0,71)
	>5 years	18	104	17.3	0.98(0.62,1.56)	2(0,38)
MMR	≤5 years	28	363	7.7	0.44(0.29,0.65)	56(35,71)
	>5 years	21	301	7.0	0.40(0.25,0.62)	60(38,75)