7 Reasons Diseases Are Spreading Faster These Days

  • Poliomyelitis, monkeypox, Marburg virus and other infectious diseases are on the rise worldwide.
  • Experts say there’s no reason for the tide to rise—a multi-layered perfect storm has been brewing for some time.
  • Leading factors include the pace of international travel, as well as greater human-wildlife contact.

2022 has been a banner year for global pandemics – and not just COVID.

First, there were reports of young children suffering from mysterious and life-threatening liver failure in the US and Europe. After that, the monkey disease increased all over the world like never before.

State epidemiologists say meningitis has killed at least a dozen people in Florida this year, and the deadly parechovirus has infected newborns in several states — at least one infant died in Connecticut. Diphtheria is on the rise again in Australia and Belgium, and cases of Marburg virus have been identified for the first time in Ghana.

Then, last week, New York City announced the presence of polio in its sewage, mirroring an unusual trend that appeared in London’s sewers in the spring.

“It’s like all the biblical plagues are coming back, isn’t it?” Dr. Madhukar Pai, McGill’s global health expert, told Insider.

It didn’t happen overnight, and it’s not a direct result of the pandemic, but disease experts agree: the pace of these infectious outbreaks is accelerating.

According to Pai and other top experts, there is no single “simple” explanation. Instead, there is a broad web of at least seven powerful, interwoven issues that are driving the trend.

“It’s certainly not something we would expect to happen in public health, but it’s also something we’re worried about,” said Dr. Cornell disease control and prevention expert Jay Varma said. “If you think about it almost like a sporting event, when you consider the viruses and pathogens out there, the offense has gotten stronger and at the same time our defense has gotten weaker.”

Here are the top seven factors driving disease outbreaks in 2022.

ONE: Humans and animals are more closely related

mink covid-19

COVID spreads like wildfire through mink populations.

MacAvoy Kit/SOPA Images/LightRocket/Getty Images


As climate change pushes people and animals from their homes, pets and animal products travel the globe, and global demand for meat reaches an all-time high, we are collectively coming into contact with all kinds of animals more often than ever before. .

“The human-animal interface is broken,” said Dr. Larry Brilliant, who helped eradicate smallpox, said this recently.

The World Health Organization estimated in 2014 that 75% of today’s emerging pathogens were “of animal origin,” a number that has been accelerating in recent decades.

Human-animal interactions are how COVID first spreads to humans. Ebola, HIV, MERS, SARS, influenza and monkeypox are also animal reservoirs. When a disease is transmitted from animals to humans, it always has the potential to cause a new epidemic.

“The number one factor that drives infection is increased human-animal interactions, in unnatural or different conditions,” Varma said.

Deforestation, livestock sequestration, and wildlife trafficking all play a role.

“The human population is so large now that we’re going into all kinds of ecosystems where we’re going to encounter new organisms—organisms that we didn’t have immunity to before,” Pai added.

TWO: The pace of global travel and migration

A flight attendant rides a moving walkway at an airport with a suitcase

This year, world travel is back in a big way.

Europa Press News / Contributor / Getty Images


The global, interconnected, social nature of modern life allows disease to spread more efficiently among people than ever before. An epidemic anywhere in the world is only a flight away.

“Every time someone gets on a plane, they run the risk of bringing something new with them,” says Dr. Eric Rubin, editor-in-chief of the New England Journal of Medicine, told Insider. “The more people get on planes, the greater the risk.”

It’s a numbers game. And with the number of air travelers now skyrocketing, new pathogens can travel very quickly and very far.

In the year 2022, both monkeypox and polio hit a plane and infect people on new continents. Conversely, when global travel stopped in 2020, the flu disappeared for a year.

FOR: Exacerbation of the climate crisis

Image of an insurer inspecting flood damage.


Roberto Westbrook/Getty Images


A paper published in the journal Nature on August 8 suggests that many of the human pathogens on Earth are somehow “amplified” by climate change. Many of them already have.

“Insect-borne diseases are actually changing their patterns because the insects that carry them now have a much broader spectrum,” Rubin said, citing Zika — an example of how a disease once confined to Africa — has been allowed to spread to Asia and the rest of the world. citing America.

Chikungunya is no longer a regional threat, but is now a global disease.

“The tropics have moved to Europe and North America,” Varma said.

FOUR: Routine vaccines for children are not enough

A child receiving polio vaccine


Byron Rollins/AP Photo



During the pandemic, vaccination rates around the world dropped to a level not documented for decades. The WHO calls it “the most sustained decline in childhood vaccination coverage in nearly 30 years.”

Add to this the vaccination backslide in many rich countries, fueled by misinformation and vaccine hesitancy, and once containment, social distancing, and masking measures are eased, an increase in the spread of vaccine-preventable diseases is inevitable.

“We all need to get vaccinated otherwise we are all at risk,” Varma said.

In parts of New York’s Rockland County, polio left at least one young, unvaccinated person paralyzed, and only 37% of young children had their polio vaccines up to date. (For context: nearly 93% of the nation’s infants are vaccinated against polio.)

FIVE: The whole world is paying for years of neglect in developing countries

A provider measures monkeypox vaccine.

A nurse prepares a dose of rabies vaccine on Aug. 10, 2022, in East Los Angeles.

Mario Tama/Getty Images


“All these years, Africans have had monkey disease and nobody has done anything, nobody has given them vaccines,” Pai said. “And now, all of a sudden, all the rich countries are getting vaccinated against monkeypox?”

Finally, he said, “we will pay the price” for fighting such “archaic”, “parochial” and short-sightedness.

“If monkeypox had been better treated in Africa, it would not have spread around the world. If COVID had been better managed in low- and middle-income countries, new options would not have emerged. If Ebola had been contained in West Africa, even before it spread, it would not have come to the United States.” .

SIXTH: Changing our perception of disease risk

A screenshot of the said map on August 16, 2022 with dots all over the world

The ProMED map, a tool for infectious disease experts worldwide, is an openly accessible, policy tool to control the spread of disease. This is the view from August 16, 2022.

International Society of Infectious Diseases



We’ve also been shaped by our experiences during the pandemic, and we can’t help but incorporate that knowledge into the infectious disease news we’re reading now.

In some cases, it’s overkill, Pai said. “There’s a small outbreak in some corner of some market in China, and immediately everyone around the world panics.”

Oftentimes, anxiety increases.

These days, scientists have better tools than ever to report what’s going on—sorting viruses, testing cases, and ringing alarm bells.

“Covid has really changed the way we look at these things,” Rubin said, referring to average news readers and professional scientists. “Every day there’s a disease somewhere in the world,” he said — and that’s partly because we’re all paying more attention to them than we used to.

SEVEN: We still don’t know how exposure to COVID affects our immune system

Dr.  Acting Science Advisor to the President Francis S.  Collins is the highest-paid White House employee.

Dr. Francis Collins, former director of the National Institutes of Health, holds the coronavirus model.

Sarah Silbiger-Pool/Getty Images



New disease threats are especially dangerous now because we don’t know how COVID might affect our existing immune defenses.

“We’ll know in the coming months and years,” Pai said, “whether or not COVID is disrupting the immune system in some way that makes us more susceptible.”

He’s already worried that doctors’ overreliance on steroid and antibiotic prescriptions during the pandemic could fuel fungal infections, superbugs and antimicrobial resistance.

Another pandemic is coming. We could have stopped it, but experts fear we “gave up.”

A sign written outside a clinic in New York

People walk past a medical facility administering the monkeypox vaccine during an appointment on August 5, 2022 in New York City.

Spencer Platt/Getty Images


Scientists estimate that our chances of another pandemic “could double in the coming decades” as disease outbreaks, driven by a wide range of interconnected, complex factors, become more widespread.

And when it comes to disease prevention, “you’re better do not Thinking that 10 plagues appeared at the same time, “Rubin.”

“The answer is more investment in public health, right?” – said the father. These are often “things we give up,” he said, such as clean drinking water, good sanitation, vaccines, equitable access to treatment and clinical care, and “broken” interventions like disease research.

“It’s like thinking about our racism as an epidemic,” he says, “eventually it’s going to come back and haunt us — it’s happening.”

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