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Table 3 Description of data sources used for ascertaining vaccination status in severe acute respiratory infections case-patients identified, pilot case–control study for influenza vaccine effectiveness in Central-America, 2012 (n = 1,186)

From: Pilot to evaluate the feasibility of measuring seasonal influenza vaccine effectiveness using surveillance platforms in Central-America, 2012

 

Costa-Rica (n = 647)

El Salvador (n = 334)

Honduras (n = 107)

Panama (n = 98)

Data source

6 months − 11 years with chronic conditions, n = 339 (%)

≥65 years, n = 308 (%)

6 − 59 months, n = 287 (%)

≥60 years, n = 47 (%)

6 − 35 months, n = 60 (%)

≥60 years, n = 47 (%)

6 − 59 months, n = 91 (%)

≥60 years, n = 7 (%)

Surveillance forms or databasea

184 (54)a

39 (13)a

20 (7)

7 (15)

13 (22)a

13 (28)a

17 (19)a

0 (0)

Vaccination cards

184 (54)

39 (13)

60 (21)

0 (0)

44 (73)

17 (36)

17 (19)

0 (0)

Nominal vaccination registers

150 (44)

262 (87)

0 (0)

0 (0)

0 (0)

0 (0)

19 (21)

0 (0)

Local EPI records or vaccination facilities records

b

b

29 (0)

2 (4)

2 (3)

17 (36)

0 (0)

0 (0)

Verbal report of vaccination card review (over the phone)

5 (2)

b

0 (0)

0 (0)

13 (22)

13 (28)

0 (0)

5 (71)

Medical records

0 (0)

b

15 (5)

8 (17)

0 (0)

0 (0)

52 (57)

0 (0)

Unspecified document reviewedc

0 (0)

0 (0)

110 (38)

25 (53)

0 (0)

0 (0)

0 (0)

0 (0)

Unreachable patient/undocumented

0 (0)

7 (0)

53 (18)

5 (11)

1 (2)

0 (0)

3 (3)

2 (29)

  1. aSurveillance forms information was based on the review of vaccination cards in Costa-Rica and Panama, and on over-the-phone readings of vaccination cards in Honduras
  2. bData source not used
  3. cMay include vaccination card or any other paper document