25 years after Vi typhoid vaccine efficacy study, typhoid affects significant number of population in Nepal

PLoS One. 2014 Jan 6;9(1):e77974. doi: 10.1371/journal.pone.0077974. eCollection 2014.

Abstract

Salmonella Typhi, first isolated in 1884, results in infection of the intestines and can end in death and disability. Due to serious adverse events post vaccination, whole cell killed vaccines have been replaced with new generation vaccines. The efficacy of Vi polysaccharide (ViPS) vaccine, a new generation, single-dose intramuscular typhoid vaccine was assessed in Nepal in 1987. However, despite the availability of ViPS vaccine for more than 25 years, Nepal has one of the highest incidence of typhoid fever. Therefore we collected information from hospitals in the Kathmandu Valley from over the past five years. There were 9901 enteric fever cases between January 2008 and July 2012. 1,881 of these were confirmed typhoid cases from five hospitals in the Kathmandu district. Approximately 70% of the cases involved children under 15 years old. 1281 cases were confirmed as S. Paratyphi. Vaccines should be prioritized for control of typhoid in conjunction with improved water and sanitation conditions in Nepal and in endemic countries of Asia and Africa.

Publication types

  • Historical Article
  • Multicenter Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • History, 20th Century
  • History, 21st Century
  • Humans
  • Nepal / epidemiology
  • Population Surveillance
  • Prevalence
  • Retrospective Studies
  • Salmonella typhi / immunology*
  • Typhoid Fever / history
  • Typhoid Fever / prevention & control*
  • Typhoid-Paratyphoid Vaccines / administration & dosage
  • Typhoid-Paratyphoid Vaccines / immunology*

Substances

  • Typhoid-Paratyphoid Vaccines

Grants and funding

The project was conducted with the support of a grant from Bill and Melinda Gates foundation. The International Vaccine Institute receives core financial support from the governments of the Republic of Korea and Sweden. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.