Some epidemiological characteristics of poliomyelitis in North Vietnam in the years 1992-1999

ABSTRACT

Data were collected from the Enlarged Immunization Program and the Poliomyelitis Eradication Program (1992-1999), also including inquiry forms and guidelines for detecting, investigating, and processing by Epi-Info. Results shown the epidemic was spread in prevailing of rural population (79.3%), under 5 years old children accounted for 87.9% of cases of poliomyelitis. The outbreaks occurred all around the year with the peak on March, April, May and September, October. Wild virus of the type 1 plays the main role in 97.8% of cases