Polio primer: History, progress and hope

TL;DR

Polio, a crippling disease, remains endemic in four countries, but a global collaboration is using genetic sequencing to track the virus and stop its spread.

Transcript

in the 1950s the budding science of Virology scored its first major victories against the virus that causes polio April 12 1955 victory over epidemic polio mellitus to vaccines developed by dr. Jonas Edwards salt and dr. Albert Sabin were proven safe and effective in preventing the disease across the Western world infection rates dropped dramatical... Read More

Key Insights

• 🌍 Despite the availability of effective polio vaccines developed in the 1950s, the fight to end polio continues in the developing world.
• 🧬 A high-tech collaboration is underway using genetics to track the disease in its last remaining reservoirs on earth.
• 🌐 A global laboratory network of 145 laboratories serves every country in the world, focusing on the surveillance and detection of poliovirus.
• 🗺️ Molecular characterization and sequence analysis of the poliovirus help build genetic trees and maps to visualize the distribution and transmission of the virus.
• 🔴 Chains of transmission can be reconstructed by identifying genetically related viruses, helping determine the origin and movement of the virus in the population during the polio season.
• 💉 The Bill and Melinda Gates Foundation supports the development of new vaccines, purchase, and distribution of existing vaccines in high-risk areas.
• 🤝 Collaboration between the foundation, World Health Organization, Centers for Disease Control and Prevention, Rotary International, and UNICEF aims to eradicate polio by 2013 and prevent new cases by 2010.
• 👦 The end of polio is within reach, but efforts to vaccinate every child in every region where the virus still exists remain crucial for eradicating the disease entirely.

Questions & Answers

Q: How effective have polio vaccines been in reducing the global prevalence of the disease?

Polio vaccines developed in the 1950s have been highly effective in reducing the global prevalence of the disease. In fact, the prevalence of polio has dropped more than 99.8% since the vaccine was created.

Q: Which countries currently have endemic polio cases?

As of now, polio remains endemic in four countries: Afghanistan, Pakistan, India, and Nigeria.

Q: How is genetic sequencing used to track the polio virus?

Genetic sequencing is utilized to track the polio virus by analyzing the genetic sequence within each virus sample collected. This information helps map the distribution and spread of different members of the poliovirus family.

Q: What organizations are involved in the effort to eradicate polio?

The Bill and Melinda Gates Foundation, the World Health Organization, the Centers for Disease Control and Prevention, Rotary International, and UNICEF have joined forces to eradicate polio by supporting the development, purchase, and distribution of vaccines in high-risk areas.

Q: What is the timeline for eradicating polio?

The goal of the global collaboration is to have no new cases of polio by 2010 and to completely eradicate the disease by 2013.

Answer: Polio, a crippling disease caused by a highly contagious virus, has been largely eradicated in the Western world thanks to vaccines developed in the 1950s. However, polio remains endemic in four countries—Afghanistan, Pakistan, India, and Nigeria. To track and stop the spread of the virus, a global collaboration is using genetic sequencing. The genetic sequence within each virus sample collected is analyzed, enabling the mapping of the distribution and spread of the poliovirus. This information helps health officers on the ground redirect vaccine shipments and immunize the most at-risk children. The Bill and Melinda Gates Foundation is supporting the development and distribution of vaccines in high-risk areas, aiming to eradicate polio by 2013.

Summary & Key Takeaways

• In the 1950s, polio vaccines were developed and drastically reduced the prevalence of the disease in the Western world.

• Polio remains endemic in four countries, and a global collaboration is using genetic sequencing to track the virus and identify high-risk areas.

• The Bill and Melinda Gates Foundation is supporting the development of new vaccines and aims to eradicate polio by 2013.