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Epidemiology and evolution of invasive pneumococcal disease caused by multidrug resistant serotypes of 19A in the 8 years after implementation of pneumococcal conjugate vaccine immunization in Dallas, Texas.
Pediatr Infect Dis J. 2010 Apr; 29(4):294-300.PI

Abstract

BACKGROUND

The heptavalent pneumococcal conjugate vaccine (PCV7) has significantly reduced vaccine-type invasive pneumococcal disease (IPD) in children. An increasing percentage of IPD cases are now caused by nonvaccine serotypes. The purpose of our observational study was to define the epidemiology of pneumococcal disease in Dallas, TX children for 8 years after implementation of PCV7 immunization.

METHODS

Streptococcus pneumoniae isolates from normally sterile sites were collected at Children's Medical Center of Dallas from January 1, 1999 to December 31, 2008. Incidence of IPD was calculated using inpatient and emergency center admissions to Children's Medical Center of Dallas as the denominator. Isolates were serotyped and penicillin and cefotaxime susceptibilities were determined. Serotype 19A isolates were further characterized by multilocus sequence typing.

RESULTS

Compared with the prevaccine period of 1999-2000, there was a significant reduction in the incidence of IPD from 2002 to 2008 (P < 0.05), although a significant increase in IPD incidence was observed from 2006 to 2008 (P = 0.038). The number of IPD cases caused by serotype 19A increased from 1999 to 2008 (P < 0.001). There were significant increases in penicillin and cefotaxime nonsusceptible 19A isolates during this 10-year period (P < 0.001 and P = 0.004, respectively). The most common sequence type (ST) of the 19A isolates was ST-199 (42.7%). Clonal complex (cc-156) and cc-320 emerged in the period of 2005-2008 as penicillin and cefotaxime resistant 19A strains.

CONCLUSIONS

In Dallas, PCV7 immunization reduced significantly the incidence of IPD caused by vaccine-type strains. A significant increase in IPD caused by serotype 19A was observed. The penicillin and cefotaxime nonsusceptible STs, not previously identified in Dallas, have recently become an important cause of IPD.

Authors+Show Affiliations

Department of Pediatrics, Division of Infectious Diseases, University of Texas Southwestern Medical Center, Dallas, TX, USA. chonmet@yahoo.comNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

19949357

Citation

Techasaensiri, Chonnamet, et al. "Epidemiology and Evolution of Invasive Pneumococcal Disease Caused By Multidrug Resistant Serotypes of 19A in the 8 Years After Implementation of Pneumococcal Conjugate Vaccine Immunization in Dallas, Texas." The Pediatric Infectious Disease Journal, vol. 29, no. 4, 2010, pp. 294-300.
Techasaensiri C, Messina AF, Katz K, et al. Epidemiology and evolution of invasive pneumococcal disease caused by multidrug resistant serotypes of 19A in the 8 years after implementation of pneumococcal conjugate vaccine immunization in Dallas, Texas. Pediatr Infect Dis J. 2010;29(4):294-300.
Techasaensiri, C., Messina, A. F., Katz, K., Ahmad, N., Huang, R., & McCracken, G. H. (2010). Epidemiology and evolution of invasive pneumococcal disease caused by multidrug resistant serotypes of 19A in the 8 years after implementation of pneumococcal conjugate vaccine immunization in Dallas, Texas. The Pediatric Infectious Disease Journal, 29(4), 294-300. https://doi.org/10.1097/INF.0b013e3181c2a229
Techasaensiri C, et al. Epidemiology and Evolution of Invasive Pneumococcal Disease Caused By Multidrug Resistant Serotypes of 19A in the 8 Years After Implementation of Pneumococcal Conjugate Vaccine Immunization in Dallas, Texas. Pediatr Infect Dis J. 2010;29(4):294-300. PubMed PMID: 19949357.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Epidemiology and evolution of invasive pneumococcal disease caused by multidrug resistant serotypes of 19A in the 8 years after implementation of pneumococcal conjugate vaccine immunization in Dallas, Texas. AU - Techasaensiri,Chonnamet, AU - Messina,Allison F, AU - Katz,Kathy, AU - Ahmad,Naveed, AU - Huang,Rong, AU - McCracken,George H,Jr PY - 2009/12/2/entrez PY - 2009/12/2/pubmed PY - 2010/7/8/medline SP - 294 EP - 300 JF - The Pediatric infectious disease journal JO - Pediatr Infect Dis J VL - 29 IS - 4 N2 - BACKGROUND: The heptavalent pneumococcal conjugate vaccine (PCV7) has significantly reduced vaccine-type invasive pneumococcal disease (IPD) in children. An increasing percentage of IPD cases are now caused by nonvaccine serotypes. The purpose of our observational study was to define the epidemiology of pneumococcal disease in Dallas, TX children for 8 years after implementation of PCV7 immunization. METHODS: Streptococcus pneumoniae isolates from normally sterile sites were collected at Children's Medical Center of Dallas from January 1, 1999 to December 31, 2008. Incidence of IPD was calculated using inpatient and emergency center admissions to Children's Medical Center of Dallas as the denominator. Isolates were serotyped and penicillin and cefotaxime susceptibilities were determined. Serotype 19A isolates were further characterized by multilocus sequence typing. RESULTS: Compared with the prevaccine period of 1999-2000, there was a significant reduction in the incidence of IPD from 2002 to 2008 (P < 0.05), although a significant increase in IPD incidence was observed from 2006 to 2008 (P = 0.038). The number of IPD cases caused by serotype 19A increased from 1999 to 2008 (P < 0.001). There were significant increases in penicillin and cefotaxime nonsusceptible 19A isolates during this 10-year period (P < 0.001 and P = 0.004, respectively). The most common sequence type (ST) of the 19A isolates was ST-199 (42.7%). Clonal complex (cc-156) and cc-320 emerged in the period of 2005-2008 as penicillin and cefotaxime resistant 19A strains. CONCLUSIONS: In Dallas, PCV7 immunization reduced significantly the incidence of IPD caused by vaccine-type strains. A significant increase in IPD caused by serotype 19A was observed. The penicillin and cefotaxime nonsusceptible STs, not previously identified in Dallas, have recently become an important cause of IPD. SN - 1532-0987 UR - https://www.unboundmedicine.com/medline/citation/19949357/Epidemiology_and_evolution_of_invasive_pneumococcal_disease_caused_by_multidrug_resistant_serotypes_of_19A_in_the_8_years_after_implementation_of_pneumococcal_conjugate_vaccine_immunization_in_Dallas_Texas_ L2 - https://doi.org/10.1097/INF.0b013e3181c2a229 DB - PRIME DP - Unbound Medicine ER -