Vaccine	Cases	Person year	Incidence rate^a	Incidence rate ratio^b	CI^c
No vaccine	9	158	5679
1 dose	17	961	1768	3.2	1.4 - 7.2
2 doses	31	2583	1200	4.7	2.3 - 9.9
3 doses	50	5714	875	6.5	3.2 - 13.2
Total vaccinated	97	9258	1048	5.4	2.7 - 10.7