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Home NEWS Science News Health

Caution: 1918 influenza provides warning for potential future pandemic reemergence

Bioengineer by Bioengineer
February 10, 2021
in Health
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Credit: Siddarth Chandra

EAST LANSING, Mich. – The 1918 influenza pandemic provides a cautionary tale for what the future may hold for COVID-19, says a Michigan State University researcher.

After a decade studying a flu virus that killed approximately 15,000 Michigan residents, Siddharth Chandra, a professor in MSU’s James Madison College, saw his research come to life as he watched the spread of the COVID-19 pandemic.

“It was so surreal,” said Chandra, who has a courtesy appointment in epidemiology and biostatistics. “All of a sudden, I was living my research.”

Chandra’s research is published in the American Journal of Public Health with co-authors Julia Christensen, a graduate of James Madison College; Madhur Chandra, Senior Community Epidemiologist with the Ingham County Health Department and graduate of the Department of Epidemiology and Biostatistics at MSU; and Nigel Paneth, professor of epidemiology and biostatistics and pediatrics at MSU.

Using influenza infection and mortality data on Michigan from 1918-1920, Chandra identified four distinct waves. The first large peak was in March 1918. “After a second spike in cases in October 1918, the governor instituted a statewide ban on public gatherings,” Chandra said. “Much like the restrictions that were put in place during the COVID-19 pandemic.”

After three weeks, the number of cases decreased and the ban was lifted, which led to another peak in December 1918. “The ban didn’t stop the spread of the flu. It just delayed the spike in cases,” he said.

Chandra mapped the data showing the peaks and spikes in cases from October 1918 and December 1918 and tracked flu virus case growth by county over time. In October, counties in the southern part of the state and near the Mackinac Straits had the highest numbers but by December, the highest numbers of cases were in the heart of the state.

The most surprising piece of data came 18 months later in February 1920, when a statewide explosion of cases created a massive spike even larger than the one in October 1918. For Chandra, it is an educated guess as to the reasons for this delayed increase.

“Assuming it’s the same influenza virus, World War I ended in 1918 and the men were coming home to their families,” he said. “We had a mobile agent that brought the virus home to infect family members, which would explain the increase in cases among children and the elderly.”

Unfortunately, there is not a way to confirm this, Chandra noted. “We would need samples from patients in 1920 from across the state. Then, we would need to compare those with samples from patients in 1918 from across the state, and that’s not likely to happen.”

The weather may have also been a factor since cool temperatures with low humidity likely provided optimal conditions for the virus to live and spread. Another factor that played a role was the absence of a vaccine.

“In 1918, there was no hope for a vaccine. In 2021, we have a vaccine available,” he said.

One of the key insights from the 1918 pandemic that can inform the public health response to the 2020 COVID-19 pandemic is the number of people who are susceptible to the virus. Which means that it is possible that a spike like the February 1920 one will occur in late 2021 or early 2022.

“So many people will remain susceptible until they get vaccinated,” Chandra said. “Bad things can still happen a year or two from now even if we see a decrease in the number of cases now. We still have over 200 million people walking around who are susceptible to the virus, including myself.”

###

(Note for media: Please include the following link to the study in all online media coverage: https://ajph.aphapublications.org/doi/10.2105/AJPH.2020.305969)

Michigan State University has been working to advance the common good in uncommon ways for more than 165 years. One of the top research universities in the world, MSU focuses its vast resources on creating solutions to some of the world’s most pressing challenges, while providing life-changing opportunities to a diverse and inclusive academic community through more than 200 programs of study in 17 degree-granting colleges.

For MSU news on the Web, go to MSUToday. Follow MSU News on Twitter at twitter.com/MSUnews

Media Contact
Caroline Brooks
[email protected]

Original Source

https://msutoday.msu.edu/news/2021/pandemic-reemergence

Tags: Death/DyingEpidemiologyInfectious/Emerging DiseasesMedicine/HealthPublic HealthVaccinesVirology
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