[Poliomyelitis eradication is a visible unsolved problem in the coming years]

Area of Science:

• Virology
• Epidemiology
• Public Health

Context:

• The Global Polio Eradication Initiative, launched in 1988, aimed to eradicate wild polioviruses by 2000.
• Significant progress has reduced polio cases from 350,000 annually to 1,500-2,000, but eradication targets have been repeatedly missed.
• Circulating vaccine-derived polioviruses (cVDPVs) pose a persistent threat, maintaining pathogenicity and neurovirulence.

Purpose:

• To analyze the ongoing challenges in global polio eradication.
• To highlight the role of vaccine-derived polioviruses in continued transmission and disease.
• To discuss strategies for managing polio in the presence of cVDPVs.

Summary:

• Wild poliovirus cases have drastically reduced, but eradication remains elusive due to vaccine-derived strains.
• Vaccine-derived polioviruses, particularly type 2, can regain neurovirulence and cause paralytic poliomyelitis, as evidenced by reported cases.
• Complete eradication of all poliovirus types is currently not feasible, necessitating a focus on transmission interruption and morbidity reduction.

Impact:

• The persistence of cVDPVs necessitates ongoing vaccination efforts to prevent outbreaks and paralytic disease.
• Understanding the epidemiology of cVDPVs is critical for refining global polio eradication strategies.
• The findings underscore the complexity of eradicating polioviruses and the need for adaptive public health interventions.