Polio, short for poliomyelitis, is a highly infectious viral disease that primarily affects young children. Caused by the poliovirus, it can lead to permanent paralysis and even death in severe cases. Despite being largely eradicated in many parts of the world, it remains a significant public health concern, particularly in regions with low vaccination rates. This blog will delve into the history, transmission, symptoms, prevention, and ongoing efforts to eradicate the disease globally.


A Brief History

Polio has been known since ancient times, with depictions of the disease found in Egyptian carvings and paintings. However, it wasn’t until the late 19th and early 20th centuries that polio epidemics became more widespread, particularly in industrialized countries. The development of the iron lung in the 1920s and 1930s provided some relief for patients with respiratory paralysis caused by polio.


The turning point in the fight against the disease came with the development of vaccines. In 1955, Dr. Jonas Salk introduced the inactivated poliovirus vaccine (IPV), followed by Dr. Albert Sabin’s oral poliovirus vaccine (OPV) in 1961. These vaccines have been instrumental in reducing the incidence of polio worldwide.



Poliovirus is transmitted primarily through the fecal-oral route, meaning it spreads via contaminated food and water. It can also spread through direct contact with an infected person. The virus multiplies in the intestine and can invade the nervous system, leading to paralysis.



Polio can present in various forms:

  1. Asymptomatic: Most people infected with poliovirus (about 72 out of 100) will not show any symptoms. However, they can still spread the virus to others.
  2. Non-paralytic polio: Some individuals may experience flu-like symptoms such as fever, fatigue, headache, vomiting, stiffness in the neck, and pain in the limbs. These symptoms usually resolve within a few days to weeks.
  3. Paralytic polio: This severe form of the disease affects the nervous system, leading to muscle weakness and acute flaccid paralysis. Paralysis can occur within hours of infection and can be permanent. In some cases, the respiratory muscles are affected, leading to difficulty breathing and potentially death.


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Prevention and Vaccination

Vaccination is the most effective way to prevent the disease. There are two types of vaccines available:

  1. Inactivated Poliovirus Vaccine (IPV): Administered via injection, IPV is used in many countries, including the United States, as part of routine childhood immunizations. It provides excellent protection against all three types of poliovirus.
  2. Oral Poliovirus Vaccine (OPV): Administered orally, OPV is used extensively in mass immunization campaigns in developing countries. It is highly effective and easier to administer, especially in areas with limited medical infrastructure.


Global Efforts to Eradicate the disease

The Global Polio Eradication Initiative (GPEI), launched in 1988, has been at the forefront of the fight against polio. Through widespread vaccination campaigns and surveillance, the incidence of polio has decreased by over 99%. However, challenges remain, particularly in regions with ongoing conflicts, weak health systems, and vaccine hesitancy.


The Road Ahead

Despite significant progress, polio remains endemic in two countries: Afghanistan and Pakistan. Continued efforts are needed to address the remaining challenges and ensure every child receives the polio vaccine. Additionally, countries that have eradicated polio must maintain high vaccination coverage to prevent reintroduction of the virus.

Polio is a preventable disease that continues to pose a threat in certain parts of the world. Through sustained global efforts, improved vaccination coverage, and robust surveillance, we can achieve a polio-free world. The success of polio eradication will not only save lives but also serve as a model for combating other infectious diseases.


To consult a Pediatrician at Sparsh Diagnostic Centre, call our helpline number 9830117733.





No content on this site, regardless of date, should ever be used as a substitute for direct medical advice from your doctor or other qualified clinician.


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One Reply to “Polio”

  1. […] prevention. They have been developed for a wide range of infectious diseases, including tetanus, polio, measles, mumps, rubella, influenza, and hepatitis B. Vaccines are highly effective in preventing […]

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