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BMC Pediatrics
Published in: BMC Pediatrics 1/2015

Open Access 01-12-2015 | Research article

Monitoring of timely and delayed vaccinations: a nation-wide registry-based study of Norwegian children aged < 2 years

Authors: Øystein Rolandsen Riise, Ida Laake, Marianne Adeleide Riise Bergsaker, Hanne Nøkleby, Inger Lise Haugen, Jann Storsæter

Published in: BMC Pediatrics | Issue 1/2015

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Abstract

Background

Delayed vaccinations increase the risk for vaccine preventable diseases (VPDs). Monitoring of delayed vaccinations by using a national immunisation registry has not been studied in countries recommending a two-dose (3 and 5 months of age) primary series of e.g., pertussis vaccine. Surveillance/monitoring of all vaccinations may improve vaccination programmes functioning.

Methods

We obtained information from the Norwegian immunisation registry (SYSVAK) on all programme vaccinations received at age up to 730 days in children born in 2010 (n = 63,382). Timely vaccinations were received up to 7 days after the recommended age. Vaccinations were considered delayed if they were received more than one month after the recommended age in the schedule.

Results

In vaccinated children, timely administration of the subsequent three doses of pertussis and one dose of measles occurred in 73.8, 47.6, 53.6 and 43.5 % respectively. Delay for one or more programme vaccinations (diphtheria, tetanus, pertussis, polio, Haemophilus influenza type B, invasive pneumococcal disease, measles, mumps or rubella) was present in 28,336 (44.7 %) children. Among those who were delayed the mean duration was 139 days. The proportion of children that had vaccinations delayed differed among counties (range 37.4 %–57.8 %). Immigrant children were more frequently delayed 52.3 % vs. 43.1 %, RR 1.21 (95 % CI 1.19, 1.24). Children scheduled for vaccines in the summer holiday month (July) were more frequently delayed than others (1st dose pertussis vaccine 6.5 % vs. 3.9 % RR 1.65 (95 % CI 1.48, 1.85). Priming against pertussis (2nd dose), pneumococcal (2nd dose) and measles (1st dose) was delayed in 16.8, 18.6 and 29.3 % respectively.

Conclusion

Vaccinations were frequently delayed. Delayed vaccinations differed among counties and occurred more frequently during the summer vacation (July) and in the immigrant population. Monitoring improves programme surveillance and may be used on an annual basis.
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Metadata
Title
Monitoring of timely and delayed vaccinations: a nation-wide registry-based study of Norwegian children aged < 2 years
Authors
Øystein Rolandsen Riise
Ida Laake
Marianne Adeleide Riise Bergsaker
Hanne Nøkleby
Inger Lise Haugen
Jann Storsæter
Publication date
01-12-2015
Publisher
BioMed Central
Published in
BMC Pediatrics / Issue 1/2015
Electronic ISSN: 1471-2431
DOI
https://doi.org/10.1186/s12887-015-0487-4

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