Chloe Ramirez
Vaccines have significantly reduced the prevalence of diseases and saved countless lives. Smallpox, for instance, was eradicated in 1979 due to the widespread use of the smallpox vaccine, which was first developed in 1796. Similarly, rinderpest, a lethal cattle plague, was eradicated in 2011 due to successful vaccination campaigns. Other diseases, such as polio, measles, and cholera, have been controlled or nearly eradicated thanks to immunization programs. The World Health Organization (WHO) estimates that global immunization efforts have saved at least 154 million lives over the past 50 years, with measles vaccination alone saving nearly 94 million lives. Vaccines have been instrumental in reducing infant mortality and ensuring that children lead healthy lives into adulthood.
| Characteristics | Values |
|---|---|
| Diseases eradicated | Smallpox, Rinderpest |
| Diseases nearly eradicated | Polio |
| Diseases controlled or eliminated | Measles, Diphtheria, Malaria, Rubella, Yellow Fever, Cholera, Tuberculosis, Japanese Encephalitis, Hepatitis B, Pertussis, Invasive Pneumococcal Disease, Rotavirus, Meningitis A, Mumps, Ebola, HPV |
| Lives saved | At least 154 million in the past 50 years |
| Infant mortality reduction | 40% globally, over 50% in the African Region |
| Full health years gained | 10.2 billion over 5 decades |
| People walking due to polio vaccination | Over 20 million |
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What You'll Learn
Smallpox was the first human disease to be eradicated by vaccination
Smallpox is an infectious disease caused by the variola virus. It is believed to have originated as a rodent virus around 10,000 B.C. and subsequently spread to humans, causing large-scale epidemics and ravaging entire populations. It is thought that a large-scale epidemic contributed to the decline of the Roman Empire, and it also took down the Inca and Aztec empires when it was introduced to the New World by Spanish and Portuguese conquistadores.
In the 18th century, smallpox killed 400,000 people annually in Europe, and it is estimated that it killed 300 million people in the 20th century alone. The symptoms of smallpox were gruesome and often led to death within two weeks. Those who survived were often left with permanent harm, such as blindness and infertility.
The development of the smallpox vaccine by Edward Jenner in 1796 marked a turning point in the fight against this deadly disease. Jenner's idea was to inject healthy individuals with a small amount of cowpox, a less deadly but closely related disease. Vaccination gradually replaced the practice of variolation, and in 1801, Jenner published his treatise, "On the Origin of Vaccine Inoculation," where he expressed his hope that vaccination would lead to the annihilation of smallpox.
In the 1950s, Russia advocated for a global push to eradicate smallpox, and the World Health Organization (WHO) launched the Smallpox Eradication Programme in 1959. However, this initial campaign faced challenges due to a lack of funds, personnel, commitment from countries, and vaccine donations. It wasn't until 1967 that the WHO launched a full-force global eradication program with renewed political commitment and the contributions of hundreds of thousands of local surveillance officers and health workers.
The Intensified Eradication Program, which began in 1967, played a crucial role in the success of the global eradication efforts. Laboratories in many countries were able to produce higher-quality freeze-dried vaccines, and the introduction of the bifurcated needle improved the vaccination process. By 1971, smallpox was eradicated from South America, followed by Asia in 1975, and finally Africa in 1977.
In October 1979, the last case of smallpox was reported in Somalia, and by 1980, smallpox was officially declared eradicated by the World Health Assembly. This achievement is considered the biggest milestone in global public health, demonstrating the power of vaccines in protecting public health and saving lives.
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Rinderpest is the only animal disease to be eradicated through vaccination
Vaccines have made an enormous contribution to global health. Two major infections, smallpox and rinderpest, have been eradicated. Rinderpest, also known as "cattle plague", is the only animal disease to be eradicated through vaccination.
Rinderpest was a devastating affliction of livestock and wildlife, and for centuries, it was a major threat to food production for societies that depended heavily on livestock. The virus spread via droplets, so animals got infected by inhaling the breath, secretions, or excretions of sick animals. The disease was reported in Central Asia, Europe, the Americas, and Australia, with a lower prevalence in the latter two. However, it triggered extensive famines in Africa and hindered agricultural development in Asia.
Attempts to vaccinate animals against the disease were made as early as 1744 in the Netherlands. Thailand, the Philippines, and Iran managed to eliminate rinderpest before World War II, largely using inactivated virus samples from cows. In 1960, English veterinary scientist Walter Plowright developed an inactivated vaccine that induced lifelong immunity without major side effects or the risk of further transmission, and which could be produced at a low cost. This vaccine played a crucial role in achieving disease eradication in 2011.
The Food and Agriculture Organization (FAO) of the United Nations launched the Global Rinderpest Eradication Programme (GREP) in 1994, with the goal of eradicating the disease by 2010. The programme implemented effective rinderpest control programs in affected areas worldwide, utilizing a ring vaccination strategy similar to that used for smallpox. The last known rinderpest outbreak occurred in Kenya in 2001, and over the next ten years, GREP continued to search for rinderpest samples without finding any.
Rinderpest was officially declared eradicated by the World Organization for Animal Health (OIE) on May 25, 2011. This declaration was made after the disease had not been detected for ten years, and it marked a significant milestone in the history of animal health and food security.
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Vaccines have helped control measles
Vaccines have played a crucial role in controlling measles, a highly contagious disease that has long been endemic worldwide. Before the introduction of measles vaccines, major epidemics occurred approximately every two to three years, causing about 2.6 million deaths annually, with children under five being the most vulnerable.
The development of the measles vaccine began in 1954 when John F. Enders and Dr Thomas C. Peebles isolated the measles virus from blood samples collected during a measles outbreak. The first measles vaccine was licensed in the United States in 1963, and mass vaccination programmes were introduced at the national level in various countries from the 1960s onwards. The World Health Organization (WHO) also played a pivotal role in increasing vaccine coverage, particularly in low- and middle-income countries, through its Expanded Programme on Vaccination (EPI) launched in 1974.
The impact of measles vaccines has been significant. In May 1967, The Gambia became the first country to interrupt the transmission of the measles virus, thanks to immunization campaigns. Globally, measles vaccination has contributed to reducing infant mortality rates, saving an estimated 60 million lives between 2000 and 2023. The availability of the vaccine has drastically reduced measles disease rates worldwide, with the WHO reporting that measles vaccines have directly contributed to preventing over 94 million deaths since 1974.
The success of measles vaccination efforts is evident in the United States, which declared measles eliminated in 2000 due to highly effective vaccination programs. The Americas Region as a whole has also made significant progress, with measles elimination efforts beginning in 1991 and resulting in controlled measles outbreaks. However, the COVID-19 pandemic has presented challenges, and there is a need to strengthen immunization programs and surveillance systems to maintain progress and achieve regional elimination targets.
In conclusion, vaccines have undoubtedly helped control measles. The availability of safe, effective, and inexpensive measles vaccines has reduced disease rates, prevented deaths, and saved millions of lives worldwide. Continued efforts to improve vaccine coverage and address immunity gaps are crucial to sustaining this progress and protecting vulnerable populations from the devastating consequences of measles.
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Polio is on the brink of eradication
Vaccines have made an enormous contribution to global health. Infectious diseases such as smallpox and rinderpest have been eradicated, and polio is on the brink of meeting the same fate. The World Health Organization (WHO) has stated that vaccines are among the most powerful inventions in history, making once-feared diseases preventable. Indeed, the development and distribution of vaccines have saved at least 154 million lives over the past 50 years, with the vast majority (101 million) being infants.
Polio has been a key target of vaccine campaigns, and these efforts have been very successful. The last reported case of wild poliovirus in Nigeria was in 2016, and the country has since officially stopped endemic transmission. As of August 2024, Afghanistan and Pakistan are the only two countries where the disease is still classified as endemic, with wild poliovirus type 1 (WPV1) and circulating vaccine-derived poliovirus type 2 (cVDPV2) still persisting.
The oral polio vaccine (OPV) has been a crucial tool in the fight against polio. It is highly effective, inexpensive, and easy to administer, making it the favored vaccine of many countries. The availability of OPV has bolstered efforts to eradicate polio, and the campaign to eliminate the disease could succeed in the next few years. However, it is important to note that eradication is not the same as extinction. Polio could still lurk in testing labs, manufacturing facilities, and even some people. Therefore, even after polio is eradicated, continued vigilance and immunization efforts will be necessary to prevent its resurgence.
To achieve the final goal of polio eradication, several key strategies have been outlined. These include high infant immunization coverage with four doses of OPV in the first year of life in developing and endemic countries, routine immunization with OPV or IPV elsewhere, and the organization of "national immunization days" to provide supplementary doses of OPV to all children under five years old. Active surveillance for poliovirus through reporting and laboratory testing of all cases of acute flaccid paralysis (AFP) is also crucial.
The world is on the verge of eradicating polio, and the success of vaccine campaigns has been remarkable. However, the final steps towards eradication are formidable, and continued investment and collaboration will be necessary to achieve this goal and ensure that polio does not return.
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Vaccines have saved at least 154 million lives over the past 50 years
Vaccines are one of the most powerful inventions in history, preventing once-feared diseases and saving millions of lives. Over the past 50 years, global immunization efforts have saved at least 154 million lives, according to a study led by the World Health Organization (WHO). This equates to around 6 lives saved every minute of every year.
The Expanded Programme on Immunization (EPI), launched by the WHO in 1974, has been a significant milestone in public health. The programme aimed to vaccinate all children against diphtheria, measles, pertussis (whooping cough), polio, tetanus, tuberculosis, and smallpox. Since its launch, the programme has contributed to an enormous reduction in preventable diseases and has helped to halve childhood mortality.
The study found that for each life saved through immunization, an average of 66 years of full health were gained, resulting in a total of 10.2 billion full health years gained over five decades. Vaccines have prevented nearly 94 million deaths from measles, saving 5.7 billion years of life. Measles vaccination has had the most significant impact on reducing infant mortality, accounting for 60% of the lives saved due to immunization. Other diseases targeted by the EPI, such as rubella, polio, pertussis, pneumococcal disease, and rotavirus, also disproportionately affect young children.
The success of global vaccination programs is evident, and continued investment in vaccination efforts is crucial to ensure that progress is maintained and further lives are saved.
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Frequently asked questions
Yes, smallpox and rinderpest have been eradicated due to the success of vaccines.
Vaccination against 14 diseases has directly contributed to reducing infant deaths by 40% globally, and by more than 50% in the African Region. The measles vaccination has had the most significant impact, accounting for 60% of the lives saved due to immunization.
Polio is on the brink of eradication, with cases of the wild strain now only found in Central Asia. Other diseases that have been controlled through vaccination include measles, cholera, diphtheria, rubella, yellow fever, and malaria.
Vaccines have made an enormous contribution to global health, saving at least 154 million lives over the past 50 years. They have also helped to halve childhood mortality in vulnerable countries and provided billions in economic benefits.
Vaccines work to eradicate diseases by building strong immunity against the disease in the population. For a disease to be eradicated, it must also be easily detectable, and the population must have easy access to the vaccine.
