Measles outbreak in complex emergency: estimating vaccine effectiveness and evaluation of the vaccination campaign in Borno State, Nigeria, 2019

Table 2 Age-specific vaccine effectiveness of confirmed measles cases. Borno, December 2018 – March, 2019

Age Group	Vaccinated cases	Confirmed^a cases	PCV (95% CI)	PPV	VE % (95% CI)
< 9 months^b	1	49	0.02 (0.00–0.11)	0.00	–
9–11 months	7	42	0.17 (0.07–0.31)	0.61	87.3 (71.0–95.2)
12–23 months	9	118	0.08 (0.04–0.14)	0.69	96.2 (92.6–98.3)
24–35 months	12	97	0.12 (0.07–0.21)	0.84	97.3 (95.1–98.7)
36–47 months	5	75	0.07 (0.02–0.15)	0.84	98.6 (96.7–99.6)
48–59 months	10	49	0.20 (0.10–0.34)	0.70	89.2 (77.9–95.2)
60–71 months	3	38	0.08 (0.02–0.21)	0.94	99.5 (98.3–99.9)
Overall	47	468	0.10 (0.07–0.13)	0.88	98.4 (97.8–98.8)

PCV Proportion of cases vaccinated, PPV Proportion of the population vaccinated based on 2018 PCCS report, VE Vaccine effectiveness, CI Confidence Interval.
^aCases reported from IDP camps were excluded from the VE estimation as the PCCS did not capture coverage from IDP camps
^bThe < 9 month old infants were not scheduled for measles vaccination and were excluded from the VE estimation

ISSN: 1471-2458