Vaccine	Cases	Person year	Incidence rate^a	Incidence rate ratio^b	CI^c
No vaccine	12	209	5742
1 dose	16	629	2542	2.3	1.1 - 4.8
2 doses	36	1858	1938	3.0	1.5 - 5.7
3 doses	21	1191	1763	3.3	1.6 - 6.6
Total vaccinated	73	3679	1984	2.9	1.6 - 5.3