Incidence rates of enterovirus 71 infections in young children during a nationwide epidemic in taiwan, 2008-09

Min Shi Lee, Pai Shan Chiang, Shu Ting Luo, Mei Liang Huang, Guan Yuan Liou, Kuo Chien Tsao, Tzou Yien Lin

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

Objective: Enterovirus 71 (EV71) is causing life-threatening outbreaks in tropical Asia. In Taiwan and other tropical Asian countries, although nationwide EV71 epidemics occur cyclically, age-specific incidence rates of EV71 infections that are critical to estimate disease burden and design vaccine trials are not clear. A nationwide EV71 epidemic occurred in 2008-09 in Taiwan, which provided a unique opportunity to estimate age-specific incidence rates of EV71 infections. Study Design: We prospectively recruited 749 healthy neonates and conducted follow-ups from June 2006 to December 2009. Sera were obtained from participants at 0, 6, 12, 24, and 36 months of age for measuring EV71 neutralizing antibody titers. If the participants developed suspected enterovirus illnesses, throat swabs were collected for virus isolation. Results: We detected 28 EV71 infections including 20 symptomatic and 8 asymptomatic infections. Age-specific incidence rates of EV71 infection increased from 1.71 per 100 person-years at 0-6 months of age to 4.09, 5.74, and 4.97 per 100 person-years at 7-12, 13-24, and 25-36 months of age, respectively. Cumulative incidence rate was 15.15 per 100 persons by 36 months of age, respectively. Conclusions: Risk of EV71 infections in Taiwan increased after 6 months of age during EV71 epidemics. The cumulative incidence rate was 15% by 36 months of age, and 29% of EV71 infections were asymptomatic in young children.

Original languageEnglish
Article numbere1476
JournalPLoS Neglected Tropical Diseases
Volume6
Issue number2
DOIs
Publication statusPublished - Feb 2012
Externally publishedYes

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Enterovirus Infections
Enterovirus
Taiwan
Incidence
Asymptomatic Infections
Pharynx
Neutralizing Antibodies
Disease Outbreaks
Vaccines
Newborn Infant
Viruses
Serum

ASJC Scopus subject areas

  • Pharmacology, Toxicology and Pharmaceutics(all)
  • Public Health, Environmental and Occupational Health
  • Infectious Diseases

Cite this

Incidence rates of enterovirus 71 infections in young children during a nationwide epidemic in taiwan, 2008-09. / Lee, Min Shi; Chiang, Pai Shan; Luo, Shu Ting; Huang, Mei Liang; Liou, Guan Yuan; Tsao, Kuo Chien; Lin, Tzou Yien.

In: PLoS Neglected Tropical Diseases, Vol. 6, No. 2, e1476, 02.2012.

Research output: Contribution to journalArticle

Lee, Min Shi ; Chiang, Pai Shan ; Luo, Shu Ting ; Huang, Mei Liang ; Liou, Guan Yuan ; Tsao, Kuo Chien ; Lin, Tzou Yien. / Incidence rates of enterovirus 71 infections in young children during a nationwide epidemic in taiwan, 2008-09. In: PLoS Neglected Tropical Diseases. 2012 ; Vol. 6, No. 2.
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abstract = "Objective: Enterovirus 71 (EV71) is causing life-threatening outbreaks in tropical Asia. In Taiwan and other tropical Asian countries, although nationwide EV71 epidemics occur cyclically, age-specific incidence rates of EV71 infections that are critical to estimate disease burden and design vaccine trials are not clear. A nationwide EV71 epidemic occurred in 2008-09 in Taiwan, which provided a unique opportunity to estimate age-specific incidence rates of EV71 infections. Study Design: We prospectively recruited 749 healthy neonates and conducted follow-ups from June 2006 to December 2009. Sera were obtained from participants at 0, 6, 12, 24, and 36 months of age for measuring EV71 neutralizing antibody titers. If the participants developed suspected enterovirus illnesses, throat swabs were collected for virus isolation. Results: We detected 28 EV71 infections including 20 symptomatic and 8 asymptomatic infections. Age-specific incidence rates of EV71 infection increased from 1.71 per 100 person-years at 0-6 months of age to 4.09, 5.74, and 4.97 per 100 person-years at 7-12, 13-24, and 25-36 months of age, respectively. Cumulative incidence rate was 15.15 per 100 persons by 36 months of age, respectively. Conclusions: Risk of EV71 infections in Taiwan increased after 6 months of age during EV71 epidemics. The cumulative incidence rate was 15{\%} by 36 months of age, and 29{\%} of EV71 infections were asymptomatic in young children.",
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