Alberto E Tozzi1, Simone Piga2, Carlo Corchia3, Domenico Di Lallo4, Virgilio Carnielli5, Valeria Chiandotto6, Maria Cristina Fertz7, Silvana Miniaci8, Franca Rusconi9, Marina Cuttini2. 1. Unit of Epidemiology, Bambino Gesù Children's Hospital IRCCS, Rome, Italy. Electronic address: albertoeugenio.tozzi@opbg.net. 2. Unit of Epidemiology, Bambino Gesù Children's Hospital IRCCS, Rome, Italy. 3. International Centre on Birth Defects and Prematurity, Rome, Italy. 4. Regional Health Agency of Lazio, Rome, Italy. 5. Maternal and Child Health Institute, Marche University and Salesi Hospital, Ancona, Italy. 6. Neonatal Intensive Care Unit, S. Maria della Misericordia University Hospital, Udine, Italy. 7. Neonatal Intensive Care Unit, Burlo Garofolo Maternal and Child Health Institute, IRCCS, Trieste, Italy. 8. Neonatal Intensive Care Unit, Pugliese-Ciaccio Hospital, Catanzaro, Italy. 9. Unit of Epidemiology, Anna Meyer Children's University Hospital and Regional Agency for Health of Tuscany, Florence, Italy.
Abstract
BACKGROUND: Although very preterm infants are recommended to receive immunizations, according to their chronological age, immunization start in these infants is often delayed. Aim To measure coverage and timeliness of routine immunizations in Italian very preterm infants and to assess determinants of delay. METHODS: We followed up infants 22-31 completed weeks of gestational age discharged from intensive care. We measured the proportion of children with one dose of diphtheria-tetanus-pertussis-poliohepatitis, B-Hib vaccine (DTP-Pol-HBV-Hib), measles-mumps-rubella vaccine (MMR), conjugate pneumococcal vaccine (Pnc), conjugate meningococcal C vaccine (MenC), and varicella vaccine (Var) by 24 months. We used the Kaplan Meier method and Cox proportional hazard models to estimate the age, at immunization start and determinants of timeliness for each vaccine. RESULTS: Data on 1102 (92.1%) children out of 1196 included in the cohort were analyzed. Immunization start by 24 months of age occurred in 95.9% of children for DTP-Pol-HBV-Hib; 84.0% for MMR; 49.7% for Pnc; 38.5% for MenC; and 4.1% for Var. Eighty-seven percent of participants received the first dose of DTP-Pol-HBV-Hib by 6 months of age, and 66.7% had their first MMR administered by 18 months. Hospitalization was associated with delay for all vaccines with the exception of MenC and Var. Maternal employment was associated with earlier immunization for MMR, Pnc, and MenC. DTP-Pol-HBV-Hib timeliness improved with increasing birthweight and paternal employment and decreased with a larger number of siblings in the household. MMR was delayed in children with cerebral palsy, and in those with a larger number of children in the household. Immunization for Pnc was delayed in children with larger number of siblings. CONCLUSIONS: Immunization start for all vaccines was considerably delayed in many very preterm infants. Public health strategies taking into account determinants of delay should be implemented to improve coverage and timeliness of vaccination in this group of infants.
BACKGROUND: Although very preterm infants are recommended to receive immunizations, according to their chronological age, immunization start in these infants is often delayed. Aim To measure coverage and timeliness of routine immunizations in Italian very preterm infants and to assess determinants of delay. METHODS: We followed up infants 22-31 completed weeks of gestational age discharged from intensive care. We measured the proportion of children with one dose of diphtheria-tetanus-pertussis-poliohepatitis, B-Hib vaccine (DTP-Pol-HBV-Hib), measles-mumps-rubella vaccine (MMR), conjugate pneumococcal vaccine (Pnc), conjugate meningococcal C vaccine (MenC), and varicella vaccine (Var) by 24 months. We used the Kaplan Meier method and Cox proportional hazard models to estimate the age, at immunization start and determinants of timeliness for each vaccine. RESULTS: Data on 1102 (92.1%) children out of 1196 included in the cohort were analyzed. Immunization start by 24 months of age occurred in 95.9% of children for DTP-Pol-HBV-Hib; 84.0% for MMR; 49.7% for Pnc; 38.5% for MenC; and 4.1% for Var. Eighty-seven percent of participants received the first dose of DTP-Pol-HBV-Hib by 6 months of age, and 66.7% had their first MMR administered by 18 months. Hospitalization was associated with delay for all vaccines with the exception of MenC and Var. Maternal employment was associated with earlier immunization for MMR, Pnc, and MenC. DTP-Pol-HBV-Hib timeliness improved with increasing birthweight and paternal employment and decreased with a larger number of siblings in the household. MMR was delayed in children with cerebral palsy, and in those with a larger number of children in the household. Immunization for Pnc was delayed in children with larger number of siblings. CONCLUSIONS: Immunization start for all vaccines was considerably delayed in many very preterm infants. Public health strategies taking into account determinants of delay should be implemented to improve coverage and timeliness of vaccination in this group of infants.
Authors: Nicola Laforgia; Antonio Di Mauro; Francesco Paolo Bianchi; Federica Di Mauro; Andrea Zizzi; Manuela Capozza; Silvia Intini; Maria Serena Gallone; Silvio Tafuri Journal: Hum Vaccin Immunother Date: 2018-02-15 Impact factor: 3.452
Authors: Anna Bednarek; Małgorzata Bartkowiak-Emeryk; Robert Klepacz; Barbara Ślusarska; Danuta Zarzycka; Andrzej Emeryk Journal: Med Sci Monit Date: 2018-07-23