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  • May 14, 2018

Influenza: How the 1918 Flu Vaccine Contributed to the Death of Millions

Nurses trying to accommodate the growing numbers of patients during the outbreak | Courtesy of Daily Mail
Nurses trying to accommodate the growing numbers of patients during the outbreak | Courtesy of Daily Mail
Michael Thomas

Michael Thomas

Influenza is a well-known viral infection that affects the lungs, nose, and throat. Symptoms of the flu include fever, chills, muscle aches, cough, congestion, runny nose, headaches, and fatigue. The flu is prevented by annual flu shots that build up the immune system by using a dead strain of the infection. However, that was not the case in 1918. In 1918, a flu outbreak emerged, killing millions of people wherever it spread. The flu outbreak affected children and adults. By the end of 1920, the number of flu cases began to drop. Although the flu was able to kill millions of people, this apparent strain, the Spanish flu or H1N1, was able to easily kill healthy individuals. It was lethal to healthy adults ages twenty to twenty-four, as opposed to most flu outbreaks, which kill only the very young, the elderly, and people with weakened immune systems.1 At that time, there were claims that there were vaccines that were effective against the flu, which would allow healthy individuals to fight the flu easily. But in this case, these individuals ended up dying easily, adding to the mortality rate. By the end of 1919, the 1918 flu strain quickly disappeared from the human population and was replaced by other, less virulent strains of the virus.2 At the end of the pandemic, questions arose about how healthy individuals succumbed so easily to the flu. Researchers have looked for the answers to how the healthy were so easily affected. Yet the answer seemed to be closer than they thought. This flu outbreak was able to easily kill healthy individuals because the flu strain was not properly identified, which resulted in the wrong vaccine, making healthy individuals more susceptible to the flu.

Map of the spread of influenza | Courtesy of Ian York

The flu is a contagious respiratory illness that occurs frequently in the winter and early spring. The flu is treatable and can be avoided with an annual flu shot. The flu is identified with the H#N#, in order to set a distinction between different types of flu and its subtypes, like type A flu, examples being the avian flu, H5N1, or swine flu, H2N1. The Spanish flu, or H1N1 strain, began in March of 1918 in Asia. Over the course of two to three months, the flu began to spread from Asia to Europe and to the rest of the world. The 1918 pandemic spread more or less simultaneously in three distinct waves during an approximate twelve-month period in 1918-1919, in Europe, Asia, and North America.3 By the time the flu spread into Asia, the United States, and Europe, between twenty- to forty-million people were killed by the flu, which is more than the number of people who died during WWI.4 The 1918 pandemic virus infected cells in the upper respiratory tract, transmitting easily, but also settling deep in the lungs, damaging tissue and often leading to viral as well as bacterial pneumonia.5 The flu continued to spread, causing hospitals to be overfilled with people infected by the flu. This resulted in hospitals treating patients in schools or other buildings and in tents outside of the hospitals. Near the end of 1919, the spread of the flu began to slow down and people began to recover and return to their normal lives, without the fear of the spread of the flu. Although the pandemic was over, researchers began to question why healthy individuals were easily infected with flu and how were they exposed to the flu. It would take some time before researchers identified the cause of this through a solution that was thought to have prevented the spread of the flu, which was discovered decades later, when technology had improved. Researchers have since learned that the vaccines that were provided in 1918, which were suppose to prevent the spread of the flu and build immunity against it, were ineffective.

Demographic of the Flu epidemic from Sept.14 to Oct. 5 | Courtesy of Pinterest

Vaccines have been essential in fighting illnesses. They induce an immune response in the body, in order to give the body a fighting chance against a live strain. In 1796, Edward Jenner, a British doctor, created the first successful vaccine to prevent the spread of smallpox. He did this by using a strain from cowpox and scratched it onto a boy. The boy recovered quickly from this. Jenner later exposed the same boy to smallpox, but the boy showed no sign of contracting smallpox. Edward Jenner’s discovery revolutionized medicine because it led to prevention of other illnesses that were thought to be unpreventable. Flu vaccines, in this case, help the body fight back against the flu. They are suggested by doctors because it gives the body some time to build some immunity to the flu, allowing the body to fight back against the flu easily. In order for flu vaccines to work, a dead strain of the virus is used in the vaccine because it allows the body to produce the proper immunoglobulin to fight the flu. Immunoglobulin, often referred to as white blood cells, fight antigens, a foreign substance or toxin that induce an immune response.[6. Peter F. Wright, “How Do Influenza Vaccines Work?,” Clinical Infectious Diseases 39, Volume 39, no. 7 (October 2004): 928–929.] Examples of antigens include bacteria, viruses, and foreign substances in the blood. In the case of the flu, the vaccines protect against three strains of the flu: influenza A (H1N1 and H3N2) and influenza B. In the case of the 1918 pandemic, the vaccines must not have used a dead strain or the flu was not classified as a bacteria. If the vaccines did not use the dead strain, then the amount of people who were infected were increased, which would have increased the mortality rate. It would seem likely in the case of the flu, since the mortality rate was high. But, physicians studied Edward Jenner’s work on vaccine, which would scratch this out. Yet, if the vaccine had the wrong strain, then there would be some protection against other illnesses with that strain. This would be the probable case, since there were some technology that would be useful in identifying the flu strain.

People lining up for the flu vaccine | Courtesy of the Steelworks Center of the West

During the pandemic, hospitals were overrun by the sick, soon causing hospitals to reach capacity. This resulted in hospitals creating make-shift treatment areas outside of the hospitals. In order to resolve this issue, researchers decided to look for a cause for the number of people being infected and a possible cure or prevention to the spread of the flu. Researchers theorized that the flu strain had an intrinsically high virulence, tempered only in those patients who had been born before 1889 because of exposure to a then-circulating virus that was capable of providing partial immunoprotection against the 1918 virus strain in people older than 35 years.6 This theory was proven decades later by researchers. In the search for the cure, researchers first assumed that the flu was a bacteria called Bacillus Influenzae, which was discovered by Richard Pfeiffer when he was looking into the lungs of an influenza patient.7 With Pfeiffer’s discovery, the development of the first flu vaccine was underway to deal with the outbreak. When Pfeiffer’s vaccine was released, there was a relief from the medical community because there was a hope that the number of flu patients would decrease. However, that was not the case. People were still coming in with flu symptoms. To make matter’s worse, healthy individuals who had taken the vaccine ended up in hospitals. Decades later, with further analysis and improved technology, scientists began to study why the flu vaccines were ineffective against the flu. They soon discovered that the vaccines from 1918 that were claimed to be effective against the flu, like the Pfeiffer vaccine, contained combinations of different bacterial strains.8 In addition to this discovery, researchers from 1918 did not seem to have properly identified the strain. This would have made the 1918 flu vaccine ineffective in preventing the spread of the flu and building an immunity to the flu strain. Millions of people died from the 1918 Flu Pandemic believing that the flu vaccines would have protected them against the flu.

Although the 1918 flu vaccine was not as effective as it was supposed to be in preventing the spread of infection and building immunity to fight the flu, it did help in the prevention of other illnesses. When Richard Pfeiffer discovered the bacteria that was thought to be the cause of the flu, researchers engineered the vaccine that would have prevented the spread of the flu and build immunity against it. Yet, the vaccines proved ineffective in preventing the spread and building immunity against the flu. But in 2010, an analysis was done over the flu pandemic of 1918. The analysis suggested that the vaccines that were provided reduced the attack rate of pneumonia after viral influenza infection.9 After the flu had run its course in the body, the immune system was strengthened from the fight, thus allowing it to have a temporary build of immunity from the flu until the end of the flu season. In addition, the vaccines would also have a cross protection against other bacteria-related illnesses, like streptococcus. Since the 1918 vaccine contained a strain of bacteria, it would have offered protection and immunity to other bacteria-related illnesses. The vaccines in 1918 may have been a mistake since the flu strain was proven to be not a bacteria, but it has provided more solutions to preventing the spread of bacteria related illnesses. Although the vaccines that were provided in 1918 may not have been effective against the Spanish flu, these vaccines became useful in the prevention of other bacteria-related illnesses.

Vaccines have proven to be useful in preventing illnesses. Although the Flu Pandemic of 1918 continued to kill millions until 1920, it has given insight into how the vaccines should work during flu season. In order for vaccines to be effective, the proper strain of the illness needs to be identified. If the proper strain is not identified, containment of the illness will become impossible, thus leading to more people being infected and spreading uncontrollably. This pandemic must have been a wake up call for researchers, since the flu became uncontrollable and preventing the spread of it would have eased the influx of patients entering the hospitals at that time. If it was not for this pandemic, we would not have the proper flu vaccines that would build immunity against the flu. Decades after the pandemic, flu vaccines have been properly engineered to protect against the flu strain each flu season. But scientists have learned overtime, the flu strain becomes more resistant to treatment each season. The 1918 Flu Pandemic could happen again at some point, if the flu strain is resistant to treatment.

  1. In Environmental Encyclopedia, 2011, s.v. “Flu Pandemic,” by Angela Woodward. ↵
  2. Carlo Caduff, The Pandemic Perhaps: Dramatic Events in a Public Culture of Danger (California: University of California Press, 2015), 10. ↵
  3. Jeffery K. Taubenberger and David M. Morens, “1918 Influenza: The Mother of All Pandemics,” Emerging Infectious Diseases 12, no. 1 (January 2006): 15-22. ↵
  4. Molly Billings, “The 1918 Influenza Pandemic,” Stanford  (2005): 1. ↵
  5. John M. Barry, “How the Horrific 1918 Flu Spread Across America,” Smithsonian Institution, (November 2017): 1. ↵
  6. Jeffery K. Taubenberger and David M. Morens, “1918 Influenza: The Mother of All Pandemics,” Emerging Infectious Diseases 12, no. 1 (January 2006): 16. ↵
  7. Karie Youngdahl, “Spanish Influenza Pandemic and Vaccines,” The College of Physicians of Philadelphia (December 2011): 1. ↵
  8. Darya Nesterova, “Influenza Vaccine History,” Vaccination Research Group (October 2012): 2. ↵
  9. Karie Youngdahl, “Spanish Influenza Pandemic and Vaccines,” The College of Physicians of Philadelphia (December 2011): 1. ↵

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Michael Thomas

Michael Thomas

Author Portfolio Page

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This Post Has 67 Comments

  1. Avatar
    David Castaneda Picon 19 Apr 2020 Reply

    Wow, this was such an interesting article to read taking in account that we are experiencing another pandemic (COVID-19) that is ending up with lives of a lot of people. I think this article was very well researched and explanatory, and it really explains how a vaccine that doesn’t have the apropritae strains can have a disastrous effect.

  2. Avatar
    Sara Guerrero 19 Apr 2020 Reply

    Before reading this I didn’t think the flu was something of a large scale like today’s pandemic of COVID-19. It amazes me how science was able to progress quickly to find vaccines for other diseases, and a vaccine to control the flu. It’s definitely a reminder of how history can repeat itself in a different way, but it also shows how society doesn’t learn from previous events. I think there was a lot that could’ve been done to prevent the large-scale pandemic we have today. Overall, I think the article was well researched and written.

  3. Lesley Martinez
    Lesley Martinez 9 Apr 2020 Reply

    This is such an interesting article considering that we are currently witnessing another pandemic that has already killed thousands of people. It’s shocking to read that the wrong vaccine was created, yet it helped to prevent other bacteria-related illnesses. It’s also quite frightening to know that the flu strain becomes more resistant to treatment each year, which I hope has researchers investing lots of time into these illnesses. The Spanish flu affected children and adults, which shows that anyone can be affected, even those with a healthy immune system. Nonetheless, I hope that the right vaccine can be created to fight the current virus and does not take as long as the Spanish flu for the number of cases to drop. Great article!

  4. Avatar
    Hali Garcia 5 Apr 2020 Reply

    This is a very well researched article and I really enjoyed reading it. I really enjoy reading about how vaccines are made and what is used because it is very important and it is not really something I look into to deeply. It is interesting to read about how many people died from the flu even after they got the vaccine because the dead strain of the virus was not correctly identified.

  5. Avatar
    Arsema Abera 3 Apr 2020 Reply

    This article reminds me of what’s actually happening right now the coronavirus and all and just like influenza, hospitals overflowing with sick patients and all that but I hope just like influenza we won’t have the wrong vaccine to make the matters even worse. And the funny fact is when I read this article I was reminded one-day what’s happening right now will be written into history and as one of the articles as the epidemic that got us in lockdown and panic but got a happy ending and not the wrong ending.

  6. Avatar
    Aaron Sandoval 30 Mar 2020 Reply

    This article was well written, and well researched. Having what was believed to be the vaccine to one of the most deadly viruses in history, was very important, and unfortunately, it was not what it seemed, and only resulted in more deaths, especially to those in younger age groups. The failure of this vaccine shows one of the weaknesses to science and proves that testing is very crucial to the scientific process.

  7. Avatar
    Antonio Holverstott 25 Mar 2020 Reply

    The flu vaccines for the Spanish Flu in 1918 made the pandemic worse by giving people the wrong strain of bacteria needed to build immunity but helped others build immunity to other diseases. The problems of the flu vaccine severely and negatively affected younger persons because they did not have an immunity to the disease like their parents or grandparents who experienced these types of plagues.

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