Decrease of Invasive Pneumococcal Infections in Children Among 8 Children’s Hospitals in the United States After the Introduction of the 7-Valent Pneumococcal Conjugate Vaccine
Top Cited Papers
- 1 March 2004
- journal article
- research article
- Published by American Academy of Pediatrics (AAP) in Pediatrics
- Vol. 113 (3) , 443-449
- https://doi.org/10.1542/peds.113.3.443
Abstract
Objective. To monitor clinical and microbiologic features including antimicrobial susceptibility and serogroup distribution of invasive infections caused by Streptococcus pneumoniae among children before and after the introduction of routine administration of the 7-valent pneumococcal conjugate vaccine (PCV7). Design. A 9-year (January 1, 1994 through December 31, 2002) prospective surveillance study of all invasive pneumococcal infections in children. Patients. Infants and children cared for at 8 children’s hospitals in the United States with culture-proven invasive infections caused by S pneumoniae. Results. When compared with the mean of the years 1994 to 2000, the annual number of invasive pneumococcal infections for children ≤24 months of age declined 58% in 2001 and 66% in 2002. If only the serogroups in the PCV7 are considered, the number of cases in children ≤24 months old declined 63% and 77% in 2001 and 2002, respectively. The greatest decrease was observed for serogroup-14 isolates. The number of isolates in nonvaccine serogroups increased 28% in 2001 and 66% in 2002 for children ≤24 months old. Nonvaccine serogroup-15 and -33 isolates had the greatest increase in number. The proportion of all isolates nonsusceptible to penicillin increased yearly from 1994 to 2000, reached a plateau in 2001 at 45%, and declined to 33% in 2002. Decrease in nonsusceptibility to penicillin occurred entirely in the isolates with penicillin minimum inhibitory concentration ≥2 μg/mL. Nonsusceptibility to penicillin increased slightly among nonvaccine-serotype isolates. Most infections after at least 2 doses of PCV7 were caused by nonvaccine-serotype isolates. Conclusions. Since the introduction of the PCV7, the number of invasive pneumococcal infections caused by vaccine-serogroup isolates among 8 US children’s hospitals has decreased >75% among children ≤24 months old. In addition, penicillin resistance decreased in 2002 for the first time since our surveillance began in 1993–1994. However, we have noted that replacement may be developing with serogroups 15 and 33. Furthermore, penicillin resistance seems to be increasing among nonvaccine serogroups. Surveillance must be continued to detect the emergence of changes in the distribution of serotypes as well as antibiotic susceptibility.Keywords
This publication has 13 references indexed in Scilit:
- Decline in Invasive Pneumococcal Disease after the Introduction of Protein–Polysaccharide Conjugate VaccineNew England Journal of Medicine, 2003
- The potential of pneumococcal conjugate vaccines for childrenThe Pediatric Infectious Disease Journal, 2002
- Effectiveness of heptavalent pneumococcal conjugate vaccine in children younger than five years of age for prevention of pneumoniaThe Pediatric Infectious Disease Journal, 2002
- Reduction of Nasopharyngeal Carriage ofStreptococcus pneumoniaeafter Administration of a 9‐Valent Pneumococcal Conjugate Vaccine to Toddlers Attending Day Care CentersThe Journal of Infectious Diseases, 2002
- Efficacy of a Pneumococcal Conjugate Vaccine against Acute Otitis MediaNew England Journal of Medicine, 2001
- Efficacy, safety and immunogenicity of heptavalent pneumococcal conjugate vaccine in childrenThe Pediatric Infectious Disease Journal, 2000
- Immunogenicity and Impact on Nasopharyngeal Carriage of a Nonavalent Pneumococcal Conjugate VaccineThe Journal of Infectious Diseases, 1999
- Three-Year Multicenter Surveillance of Systemic Pneumococcal Infections in ChildrenPediatrics, 1998
- Bacterial Meningitis in the United States in 1995New England Journal of Medicine, 1997
- Carriage of pneumococci after pneumococcal vaccinationThe Lancet, 1996