Polio Vaccine addresses a disease that, in global public health history, once stood as a “nightmare” threatening children’s health: poliomyelitis (commonly called “infantile paralysis”). This illness can paralyze a person’s legs or arms—paralysis that has no cure—and in severe cases, it even robs people of the ability to breathe, ultimately claiming their lives.
It can paralyze a person’s legs or arms, and this paralysis cannot be cured. In severe cases, it can even make a person unable to breathe and eventually lose their life.
At the beginning of the 20th century, this disease broke out in many countries, posing a major challenge to public health departments. However, thanks to the efforts of scientists, the vaccine was finally developed, and many countries gradually brought its spread under control.
Now, let’s first talk about how terrifying poliomyelitis is, and then take a step-by-step look at how vaccines have helped the world win this “battle against the disease”.
1.The spread and harm of poliomyelitis: It has put countless children in a difficult situation
To understand why vaccines are so important, one must first be clear about how dangerous polio is. This acute infectious disease is caused by the poliovirus, and children are its main targets.
The virus can enter the body through the mouth and quickly spread throughout the body, directly damaging the nerves – some children will be unable to stand up again as a result and can only live in wheelchairs. More seriously, the muscles responsible for breathing will be damaged by the virus, and eventually one will be unable to breathe and die.
At the beginning of the 20th century, every outbreak of the epidemic would make tens of thousands of children ill. In some countries, even several thousand children are infected every year.
Many families have a particularly hard time because their children are paralyzed or die. At that time, people were almost at a loss about this disease. It was not until the vaccine emerged that they finally saw hope.
2.The first polio vaccine: Dr. Salk’s breakthrough contribution
Facing the threat of poliomyelitis, scientists have begun to work hard to develop vaccines. In the 1950s, Dr. Jonas Salk led his team to finally develop the world’s first vaccine that could effectively prevent poliomyelitis.
This vaccine is called an “inactivated vaccine”. Simply put, it kills a live virus and then makes it into a vaccine – after being administered, it can make the body develop “resistance” and prevent the body from actually being infected with the virus.
In 1955, the Salk vaccine was officially put into use in the United States and was soon promoted worldwide. Its emergence represents a major breakthrough in global public health: not only has it slowed down the spread of the virus, but it has also significantly reduced the number of children who are paralyzed or die. Seeing fewer and fewer sick children, many countries felt for the first time that it was possible to completely eradicate this fatal disease.
3.The emergence of oral vaccines: Dr. Sabin Makes Prevention and Control More “convenient”
Although the Salk vaccine is effective, it requires an injection, which is not very convenient when it is administered to many people. At this time, another scientist, Dr. Albert Sabin, brought a new approach – in the 1960s, he developed an oral polio vaccine (abbreviated as OPV).
Unlike the Salk vaccine, the Sabin vaccine is a “live vaccine” that uses a “weakened active” virus. It does not require an injection; drinking it can help the body develop resistance. Its greatest advantage is convenience: there is no need to find a nurse to give an injection, and it can vaccinate many people at once.
It is particularly suitable for promotion all over the world. Moreover, it can also keep the body’s resistance for a longer time. Later, the World Health Organization (WHO) and other international institutions launched the Global Immunization Programme, specifically using this oral vaccine to advance the efforts to eradicate polio.
4.Global Eradication Plan: A Leap from “Control” to “Quick Eradication”
With convenient and useful vaccines, the prevention and control work around the world was soon launched. Especially from the end of the 20th century to the beginning of the 21st century, the “Global Polio Eradication Program” was officially launched, and countries began to vaccinate children on a large scale.
The effect of this plan is particularly obvious: in just a few decades, the number of people suffering from polio has been decreasing year by year. In 2000, the World Health Organization announced that the global number of cases had decreased by more than 99%, and many countries had successfully achieved the goal of “no new cases”. However, the problem has not been completely solved – in some areas, due to political instability, poor sanitary conditions and other reasons, the vaccination work is difficult to advance, and there are still occasional sporadic cases.
5.Continuous efforts: We are just one step away from complete elimination
Nowadays, poliomyelitis is rare all over the world, but we still cannot completely relax. In some countries and regions, children may still be infected occasionally. Once the prevention and control measures are relaxed, the virus may spread again.
Therefore, the international community is still continuing to promote vaccination while strengthening monitoring – as soon as anyone is found to be potentially infected, immediate measures will be taken to prevent the virus from spreading to more people.
Thanks to the persistence of global health workers, we are getting closer and closer to the complete eradication of polio. The most difficult stage has passed. As long as we keep working hard now, this disease will eventually disappear from the world.
Conclusion
The invention of the polio vaccine was a great victory in the history of global public health.From the popularization of the Salk vaccine to the Sabin oral vaccine, the success of the polio vaccine has not only saved countless lives but also provided valuable experience for the global elimination of other infectious diseases.Nowadays, the polio vaccine remains an important achievement in global health efforts.Its success has given us hope and also inspired us to continue dealing with other fatal diseases.
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