Impact of Mass Immunization Campaign in Measles-Endemic Areas: A Case-Study from Guangxi, China

Document Type

Article

Publication Date

7-1-2011

Publication Title

Journal of Infectious Diseases

DOI

10.1093/infdis/jir063

ISSN

1537-6613

Abstract

Because of limited resources, each year during the period from 1999 through 2007, only about one-quarter of the 111 counties in Guangxi province were selected by means of risk assessment to participate in Supplementary Immunization Activities (SIAs), targeting children aged 8 months to 14 years during 1999–2003 and 8 months to 10 years during 2004–2007. Approximately 2 million doses of measles vaccines were administrated each year during SIAs. Estimated from the National Notifiable Diseases Surveillance System, with a reliable internal consistency over years, the average annual incidences of measles before SIAs (1993–1998), during the first phase (1999–2003), and during the second phase (2004–2007) were 16.05, 9.10, and 2.46 cases per 100,000, respectively. The overall provincewide annual incidence decreased by 84.67%, from 12.12 cases per 100,000 in 2000 to 2.10 cases per 100,000 in 2007. The percentage of counties with annual incidence ≥10 cases per 100,000 decreased from 55% in 1993 to

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