Table 2

Number of microcephaly cases, the number identified as having congenital Zika virus syndrome, the prevalence per 10 000 births and prevalence rate ratios (PRRs) for microcephaly cases in 2015, 2016 and 2017 compared with 2010–2014

First year of data2010–2014*2015*2016*2017*
Total casesPrevalence per 10 000 births (95% CI)Total cases (CZS cases)Prevalence per 10 000 births (95% CI)PRR versus 2010–2014 (95% CI)Total cases (CZS cases)Prevalence per 10 000 births (95% CI)PRR versus 2010–2014 (95% CI)Total cases (CZS cases)Prevalence per 10 000 births (95% CI)PRR versus 2010–2014 (95% CI)
Argentina20102402.37
(2.09 to 2.70)
601.79
(1.37 to 2.31)
0.8
(0.6 to 1.0)
77 (5)2.52
(1.99 to 3.15)
1.1
(0.8 to 1.4)
78†2.85
(2.25 to 3.55)
1.2
(0.9 to 1.6)
Chile Maule201060.62
(0.13 to 2.86)
21.42
(0.17 to 5.14)
1.6
(0.3 to 8.1)
53.78
(1.23 to 8.82)
4.4
(1.3 to 14.3)
43.02
(0.82 to 7.74)
3.5
(1.0 to 12.4)
Chile National‡2016No dataNo data524.03
(3.01 to 5.28)
695.06
(3.93 to 6.40)
Colombia Bogota§2014121.16
(0.60 to 2.02)
313.02
(2.05 to 4.28)
2.6
(1.3 to 5.1)
10510.64
(8.71 to 12.88)
9.2
(5.1 to 16.7)
687.39
(5.74 to 9.36)
6.4
(3.5 to 11.8)
Colombia Cali201050.35
(0.15 to 0.85)
10.37
(0.01 to 2.04)
1
(0.1 to 8.9)
67 (1)25.59
(19.83 to 32.50)
72.7
(29.3 to 180.5)
238.66
(5.49 to 12.99)
24.6
(9.4 to 64.7)
Costa Rica20101584.09
(2.90 to 5.76)
273.76
(2.48 to 5.47)
0.9
(0.6 to 1.3)
60 (3)8.57
(6.54 to 11.03)
2
(1.5 to 2.6)
146 (17)21.22
(17.92 to 24.95)
4.8
(3.9 to 6.1)
Mexico, Nuevo Leon2015010.11
(0.00 to 0.60)
50.54
(0.17 to 1.25)
6 (3)0.67
(0.25 to 1.47)
Nicaragua201192.16
(1.12 to 4.15)
21.9
(0.23 to 6.86)
0.9
(0.2 to 4.1)
88.06
(3.48 to 15.88)
3.7
(1.4 to 9.7)
2222.37
(14.02 to 33.87)
10.4
(4.8 to 22.5)
All centres, excl Brazil4302.27
(2.02 to 2.56)
1242.32
(1.93 to 2.78)
3795.36
(4.78 to 6.00)
4165.89
(5.27 to 6.58)
Brazil20108520.58
(0.54 to 0.63)
1756 (NA)5.82
(5.55 to 6.10)
9.9
(9.2 to 10.8)
2273 (NA)7.95
(7.63 to 8.29)
13.6
(12.6 to 14.7)
559 (NA)1.91
(1.76 to 2.08)
3.3
(2.9 to 3.6)
  • NA, data not provided.

  • *Time periods selected as 2010–2014 is pre-congenital Zika syndrome for all registries, in 2015 congenital Zika syndrome occurred in Brazil and in 2016 congenital Zika syndrome occurred in remaining registry areas apart from Chile where congenital Zika syndrome did not occur.

  • †Number of cases for Argentina 2017 was obtained from National report (http://www.anlis.gov.ar/cenagem/?page_id=33).

  • ‡Chile National excludes Chile (Maule).

  • §For Colombia-Bogota, data were only available for 2014–2017. Estimates for 2015–2017 are thus relative only to 2014.

  • PRR, prevalence rate ratio.