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Sentinel surveillance system for early outbreak detection in Madagascar.

Randrianasolo L, Raoelina Y, Ratsitorahina M, Ravolomanana L, Andriamandimby S, Heraud JM, Rakotomanana F, Ramanjato R, Randrianarivo-Solofoniaina AE, Richard V - BMC Public Health (2010)

Bottom Line: Of these 26,669 fever cases, 12.3% were related to Dengue-like fever, 11.1% to Influenza-like illness and 9.7% to malaria cases confirmed by a specific rapid diagnostic test.The sentinel surveillance system represents the first nationwide real-time-like surveillance system ever established in Madagascar.Our findings should encourage other African countries to develop their own syndromic surveillance systems.Prompt detection of an outbreak of infectious disease may lead to control measures that limit its impact and help prevent future outbreaks.

View Article: PubMed Central - HTML - PubMed

Affiliation: Unité d'Epidémiologie, Institut Pasteur de Madagascar, Antananarivo, République de Madagascar.

ABSTRACT

Background: Following the outbreak of chikungunya in the Indian Ocean, the Ministry of Health directed the necessary development of an early outbreak detection system. A disease surveillance team including the Institut Pasteur in Madagascar (IPM) was organized to establish a sentinel syndromic-based surveillance system. The system, which was set up in March 2007, transmits patient data on a daily basis from the various voluntary general practitioners throughout the six provinces of the country to the IPM. We describe the challenges and steps involved in developing a sentinel surveillance system and the well-timed information it provides for improving public health decision-making.

Methods: Surveillance was based on data collected from sentinel general practitioners (SGP). The SGPs report the sex, age, visit date and time, and symptoms of each new patient weekly, using forms addressed to the management team. However, the system is original in that SGPs also report data at least once a day, from Monday to Friday (number of fever cases, rapid test confirmed malaria, influenza, arboviral syndromes or diarrhoeal disease), by cellular telephone (encrypted message SMS). Information can also be validated by the management team, by mobile phone. This data transmission costs 120 ariary per day, less than US$1 per month.

Results: In 2008, the sentinel surveillance system included 13 health centers, and identified 5 outbreaks. Of the 218,849 visits to SGPs, 12.2% were related to fever syndromes. Of these 26,669 fever cases, 12.3% were related to Dengue-like fever, 11.1% to Influenza-like illness and 9.7% to malaria cases confirmed by a specific rapid diagnostic test.

Conclusion: The sentinel surveillance system represents the first nationwide real-time-like surveillance system ever established in Madagascar. Our findings should encourage other African countries to develop their own syndromic surveillance systems.Prompt detection of an outbreak of infectious disease may lead to control measures that limit its impact and help prevent future outbreaks.

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Related in: MedlinePlus

Daily visit counts in the sentinel surveillance system in Madagascar and the moving average (over 5 days) for daily visit counts, April 10, 2007 - December 31, 2008.
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Related In: Results  -  Collection

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Figure 2: Daily visit counts in the sentinel surveillance system in Madagascar and the moving average (over 5 days) for daily visit counts, April 10, 2007 - December 31, 2008.

Mentions: Surveillance data analysis was descriptive and straightforward using standard epidemiological techniques. Data were presented in the form of tables and graphs, and included the number of cases relating to each event (figure 2). Data were organized using statistical programs, which analyzed the daily and weekly graph values of various indicators, thus obtaining a baseline pattern for each syndrome in Madagascar.


Sentinel surveillance system for early outbreak detection in Madagascar.

Randrianasolo L, Raoelina Y, Ratsitorahina M, Ravolomanana L, Andriamandimby S, Heraud JM, Rakotomanana F, Ramanjato R, Randrianarivo-Solofoniaina AE, Richard V - BMC Public Health (2010)

Daily visit counts in the sentinel surveillance system in Madagascar and the moving average (over 5 days) for daily visit counts, April 10, 2007 - December 31, 2008.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC2823701&req=5

Figure 2: Daily visit counts in the sentinel surveillance system in Madagascar and the moving average (over 5 days) for daily visit counts, April 10, 2007 - December 31, 2008.
Mentions: Surveillance data analysis was descriptive and straightforward using standard epidemiological techniques. Data were presented in the form of tables and graphs, and included the number of cases relating to each event (figure 2). Data were organized using statistical programs, which analyzed the daily and weekly graph values of various indicators, thus obtaining a baseline pattern for each syndrome in Madagascar.

Bottom Line: Of these 26,669 fever cases, 12.3% were related to Dengue-like fever, 11.1% to Influenza-like illness and 9.7% to malaria cases confirmed by a specific rapid diagnostic test.The sentinel surveillance system represents the first nationwide real-time-like surveillance system ever established in Madagascar.Our findings should encourage other African countries to develop their own syndromic surveillance systems.Prompt detection of an outbreak of infectious disease may lead to control measures that limit its impact and help prevent future outbreaks.

View Article: PubMed Central - HTML - PubMed

Affiliation: Unité d'Epidémiologie, Institut Pasteur de Madagascar, Antananarivo, République de Madagascar.

ABSTRACT

Background: Following the outbreak of chikungunya in the Indian Ocean, the Ministry of Health directed the necessary development of an early outbreak detection system. A disease surveillance team including the Institut Pasteur in Madagascar (IPM) was organized to establish a sentinel syndromic-based surveillance system. The system, which was set up in March 2007, transmits patient data on a daily basis from the various voluntary general practitioners throughout the six provinces of the country to the IPM. We describe the challenges and steps involved in developing a sentinel surveillance system and the well-timed information it provides for improving public health decision-making.

Methods: Surveillance was based on data collected from sentinel general practitioners (SGP). The SGPs report the sex, age, visit date and time, and symptoms of each new patient weekly, using forms addressed to the management team. However, the system is original in that SGPs also report data at least once a day, from Monday to Friday (number of fever cases, rapid test confirmed malaria, influenza, arboviral syndromes or diarrhoeal disease), by cellular telephone (encrypted message SMS). Information can also be validated by the management team, by mobile phone. This data transmission costs 120 ariary per day, less than US$1 per month.

Results: In 2008, the sentinel surveillance system included 13 health centers, and identified 5 outbreaks. Of the 218,849 visits to SGPs, 12.2% were related to fever syndromes. Of these 26,669 fever cases, 12.3% were related to Dengue-like fever, 11.1% to Influenza-like illness and 9.7% to malaria cases confirmed by a specific rapid diagnostic test.

Conclusion: The sentinel surveillance system represents the first nationwide real-time-like surveillance system ever established in Madagascar. Our findings should encourage other African countries to develop their own syndromic surveillance systems.Prompt detection of an outbreak of infectious disease may lead to control measures that limit its impact and help prevent future outbreaks.

Show MeSH
Related in: MedlinePlus