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Published on: July 1, 2011
[Evaluation of acute flaccid paralysis (AFP) surveillance system in 1994]
Abstract:
Increased by 40.2% compared with 1993, 3142 acute flaccidparalysis cases were reported from AFP surveillance system in 1994. A total number of 1297 counties had AFP cases reported, accounting for 45.1% of total amount of counties. Out of 3142 AFP cases, 307 were confirmed, coming from 225 counties. For children under 15 years old, the reported AFP incidence was 1.1/10(5), non-polio AFP rate was 0.83/10(5), much higher than 0.37/10(5), in 1993. 48.5% of the total AFP cases had double stool specimen taken within 0-14 days after paralysis. 79% AFP cases had been investigated within 48 hours after being reported. Some of the major monitoring indicators of AFP surveillance system were close to the WHO criterion, but the percentage of AFP cases reported within 48 hours of careseeking and AFP cases with follow-up visit after 60-70 days of paralysis were very low. Furthermore, 77.9% of the confirmed cases were diagnosea clinically by residual paralysis, so did the 46.4% of discarded cases. It is in urgent need to increase the percentage of cases classified by laboratory test.
Insights
The acute flaccid paralysis (AFP) surveillance system reported a 40.2% increase in cases in 1994. While some indicators neared WHO criteria, laboratory confirmation rates for AFP cases require urgent improvement.
Area of Science:
- Public Health
- Epidemiology
- Infectious Disease Surveillance
Background:
- The Acute Flaccid Paralysis (AFP) surveillance system is crucial for monitoring poliomyelitis and other causes of paralysis.
- In 1994, a significant increase in reported AFP cases was observed compared to the previous year.
Purpose of the Study:
- To evaluate the performance of the AFP surveillance system in 1994 based on key monitoring indicators.
- To identify areas for improvement in case detection, investigation, and classification.
Main Methods:
- Analysis of AFP case data reported through the national surveillance system in 1994.
- Comparison of surveillance indicators against World Health Organization (WHO) criteria.
- Assessment of case investigation timeliness and specimen collection rates.
Main Results:
- A 40.2% increase in AFP cases was reported in 1994, with cases from 45.1% of counties.
- The reported AFP incidence and non-polio AFP rate for children under 15 were significantly higher than in 1993.
- While 79% of cases were investigated within 48 hours, crucial indicators like timely reporting and follow-up visits were low. Laboratory confirmation was underutilized, with many cases diagnosed clinically.
Conclusions:
- The AFP surveillance system showed improved case reporting but had deficiencies in timely follow-up and laboratory confirmation.
- Urgent improvements are needed to increase the percentage of AFP cases classified through laboratory testing for accurate diagnosis and surveillance.
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