Surveillance for polioviruses

Area of Science:

• Public Health
• Virology
• Epidemiology

Background:

• Clinical case-driven surveillance for poliovirus is essential for the poliomyelitis eradication initiative (PEI).
• Acute flaccid paralysis (AFP) surveillance involves case notification, investigation, stool specimen collection, and laboratory examination.
• Environmental surveillance (ES) can be more sensitive than AFP surveillance for detecting poliovirus circulation.

Purpose of the Study:

• To highlight the importance and challenges of different poliovirus surveillance methods.
• To emphasize the need for robust monitoring systems in global polio eradication efforts.

Main Methods:

• Review of clinical case-driven surveillance (AFP) including notification, investigation, and laboratory testing.
• Assessment of environmental surveillance (ES) for poliovirus detection.
• Discussion of limitations and requirements for effective surveillance.

Main Results:

• High-quality AFP surveillance requires significant effort and collaboration among healthcare workers.
• ES is resource-intensive and not feasible in areas lacking centralized sewage systems.
• Both AFP and ES monitor only subgroups of the population, limiting direct detection of all virus excretors.

Conclusions:

• Effective poliovirus surveillance relies on a combination of methods and sustained effort.
• A prolonged period of poliovirus-free monitoring is necessary to confirm the cessation of transmission in a population.
• Global polio eradication requires continuous vigilance and adaptation of surveillance strategies.