title: Pertussis in infancy and the association with respiratory and cognitive disorders at toddler age.
abstract: Pertussis in unvaccinated infants can run a severe course and is often accompanied by complications. In this pilot study, we studied whether there is an association between pertussis hospitalisation in infancy and, respiratory symptoms, growth and cognitive development in early childhood. A group of 89 children aged 13-45 months and hospitalised for laboratory confirmed pertussis within the first six months of their life were compared with 172 children without a history of pertussis. Risk ratios (RR) with 95% confidence intervals (CI) of the association between health outcomes and pertussis in infancy were calculated. Weight-for-length and length-for-age z-scores were calculated to investigate growth. Van Wiechen scores were compared to study cognitive development. Children with a history of pertussis in infancy had a greater chance on "asthma symptoms" (RR 2.8 95%CI 1.1-7.0) on toddler age and were more likely to report "respiratory infections" (RR 3.3 95%CI 1.6-6.6). In addition, children with a history of pertussis in infancy had significantly lower weight-for-height in the first 40 months of life. No significant differences in cognitive development were found. We found an association between severe pertussis in infancy and respiratory symptoms on toddler age. The mechanisms that may underlie this association require further investigation.
authors: Centre for Infectious Disease Control, National Institute for Public Health and the Environment, Bilthoven, The Netherlands. sabine.de.greeff@rivm.nl
authors: Sabine C
authors: SC
authors: de Greeff
authors: Laura W
authors: LW
authors: van Buul
authors: Anneke
authors: A
authors: Westerhof
authors: Alet H
authors: AH
authors: Wijga
authors: Jan
authors: J
authors: van de Kassteele
authors: Bregje
authors: B
authors: Oostvogels
authors: Nicoline A T
authors: NA
authors: van der Maas
authors: Frits R
authors: FR
authors: Mooi
authors: Hester E
authors: HE
authors: de Melker
mesh_terms: D002675:Child, Preschool; D003072:Cognition Disorders / Q000453:epidemiology* / Q000209:etiology; D005260:Female; D006130:Growth Disorders / Q000453:epidemiology / Q000209:etiology; D006760:Hospitalization / Q000706:statistics & numerical data; D006801:Humans; D007223:Infant; D008297:Male; D010865:Pilot Projects; D012140:Respiratory Tract Diseases / Q000453:epidemiology* / Q000209:etiology; D014917:Whooping Cough / Q000150:complications* / Q000453:epidemiology*