There are several types of surveillance systems used globally:
Passive Surveillance: Relies on healthcare providers to report cases of diseases to health authorities. It is cost-effective but may suffer from underreporting. Active Surveillance: Involves regular, proactive collection of data from healthcare facilities. While more accurate, it is also more resource-intensive. Syndromic Surveillance: Focuses on the early detection of outbreaks by monitoring symptoms rather than confirmed diagnoses. Sentinel Surveillance: Uses selected reporting sites to provide high-quality data, often for specific diseases. Event-Based Surveillance: Monitors news, social media, and other sources for information on potential outbreaks.
