The 1993 Four Corners Outbreak: A Catalyst For All Future Pandemics?

The cruise ship outbreak of hantavirus is becoming a well-known event, but did you know there is an even more well-known hantavirus outbreak? It’s referred to as the 1993 Four Corners hantavirus outbreak. It occurred in the Four Corners region of the US (Utah, Colorado, New Mexico and Arizona).

You might say that the 1993 Four Corners hantavirus outbreak put the disease on the US map. Prior to that time, hantavirus was largely unknown in our country. But that changed in the spring of 1993, when several healthy young adults developed sudden respiratory failure and died rapidly from an unexplained illness.

 

Uncanny Resemblance to COVID

Here’s where it gets interesting. The early stages of the mystery disease in 1993 were non-specific. Symptoms were fever, muscle aches, fatigue, headache, nausea, cough—symptoms of EVERY respiratory illness. Naturally the symptoms overlap with diseases like flu, pneumonia, etc. (hmmm, sounds like COVID). Infected 1993 patients were initially diagnosed with other illnesses.

It’s also interesting that outside of the US, hantavirus was originally identified in the Korean War when soldiers became ill with severe hemorrhagic fever. Soldiers got vaccinated with only God knows what. Just sayin’.

Scientists eventually isolated the Sin Nombre virus (SNV) as the primary hantavirus responsible for the 1993 outbreak. It still accounts for most cases today in North America. “Sin Nombre” means “without a name” in Spanish; the virus was initially difficult to culture compared to most viruses. This should also sound eerily familiar.

You likely won’t be surprised to hear that PCR genetic sequencing was used to isolate the virus. This sounds familiar, too. Today, the CDC is at least acknowledging that the PCR test alone cannot be relied upon to diagnose hantavirus. So at least it seems we have made progress in that regard.

Just like the coronavirus was isolated in bats, SNV was isolated in deer mice. Neither the bats nor the deer mice actually become ill with the virus; they’re just carriers. But SNV was also isolated from human clinical samples in specialized biosafety laboratories. WHAT? BSL-4 biolabs weren’t really a thing in 1993. Well, they actually probably were, but in 1993, most people would never have heard of these facilities. During that time, these four corner states had public health labs and university research labs, you know, like the collaboration between Peter Daszak from EcoHealth Alliance and Ralph Baric from the University of North Carolina (both of whom collaborated with the Wuhan Institute of Virology). The CDC did extensive field research in these lands.

A Research Explosion

After the 1993 outbreak, these areas became “enriched” with researchers from the CDC, the Indian Health Service, and local universities. Why the Indian Health Service?

Another interesting characteristic of the 1993 outbreak is that victims were young Navajo men and the “outbreak” map largely coincided with Native American reservation land. More on that below.

Federal and academic research programs greatly increased. Rodent monitoring programs began, as did public education campaigns about how to safely clean rodent droppings. Research on rodent ecology began, as did research on zoonotic spillover (e.g. transmission to a new species). 

Researchers even did climate research, in what is likely one of the earliest incidences of relating climate change to infectious disease outbreak. They have concluded that hantavirus is higher in unusually wet seasons that create increased vegetation growth and deer mouse population explosions.  The 1993 outbreak was strongly associated with El Niño climate conditions. As an aside, everything seems to be blamed on El Nino. What did El Nino do to deserve this terrible reputation.

Research in environmental disease emergence began. Today, the area has become one of the best-studied natural laboratories for emerging zoonotic disease ecology. 

The research persisted because, another shocker, hantaviruses are notoriously challenging to grow in cell culture. Where have we heard this before? Oh yes, the elusive coronavirus with its ever-replicating strain after strain after strain. Keep in mind the virus STILL has not been isolated, even though we’re on 9th, 10th and 11th boosters at this point. Researchers still say that Sin Nombre replicates relatively slowly and often requires specialized cell lines and (the kicker) high-containment laboratory conditions.

So far, the similarities between 1993 and COVID are incredible. Infected deer mice shed the virus in droppings and urine, just like the bats in the Wuhan wet market. People become infected when breathing aerosolized rodent waste. Or something else that is aerosolized?

Person-to-person spread of Sin Nombre virus has not been documented – yet. But with the miracle of bioengineering and gain-of-function, who wants to bet this is the next thing we hear about.

Oh wait, we did hear about it. “Health authorities believe there may have been limited human-to-human transmission in the current cruise ship outbreak in 2026. But this is rare and involves the Andes strain of hantavirus, which is the only hantavirus known to occasionally spread between people. 

Interestingly, in 1993, early symptoms turned more severe. Young healthy patients quickly developed lungs that filled with fluid and died of respiratory failure. The 1993 outbreak caused Hantavirus Pulmonary Syndrome (HPS), the very serious condition that turned out to be the killer in it all with a mortality rate of 40%. Many patients required…you guess it…ventilators. COVID. Ventilators. Remdesivir. Sounds SO familiar. 

 

With Research Comes Surveillance

How much money has been spent on research since 1993? It’s hard to fully define a total because the funding has come from many agencies over more than 30 years, but estimates are possibly in the $150 to $300 million range. Dr. Tenpenny  is right—at this price tag, all of us should know about Hantavirus Pulmonary Syndrome. But we don’t because these agencies don’t want us to know.

As Dr. Tenpenny  pointed out in her recent substack about hantavirus, who has ever heard of HPS? No one. Why is that? Given the staggering amount of taxpayer-funded research, why don’t we know more? Over 5,000 papers have been written on hantavirus, so a logical conclusion is that we all should know a lot more about it. But we don’t. 

Researchers sure do. The 1993 event became a landmark case in emerging infectious disease epidemiology, and has been the source of endless funding on climate, ecology, wildlife populations, and human health. The outbreak led to decades of research involving the Centers for Disease Control and Prevention, National Institutes of Health, tribal health authorities, universities, and military infectious disease programs.

And one of the biggest research areas was HPS, which of course required disease surveillance by the CDC, an effort they continue to this day. Researchers tracked the spread and persistence of HPS across the U.S.

The Four Corners region had a tremendous increase in public health surveillance and rodent-control efforts which required home inspections. Health agencies increased everything from rodent-borne disease surveillance to respiratory illness tracking.

Keep in mind that most of this land is Indian reservation land—tribal land. Clinics serving tribal areas began more surveillance. There was so much surveillance that tribes felt the government might have ulterior motives. 

The Indian Health Service

What’s also interesting is that these states have a unique healthcare entity that many don’t have—tribal public health programs for Native Americans—namely the federal Indian Health Service.

The 1993 outbreak gave CDC and other public health agencies a bona fide reason to “work more closely” with tribal authorities on a whole host of measures. In fact, the agencies moved toward a joint outbreak response framework rather than conducting their own isolated investigations.

It is important to shed some light on the Indian Health Service (IHS), an agency that has faced recurring controversies for decades. Several major scandals have occurred. The HHS Inspector general among others has investigated the HIS for inadequate credentialing and supervision, chronic physician shortages, emergency room shutdowns, delayed diagnoses, medication errors, and preventable deaths. In one report, at least 66 deaths were tied to alleged malpractice at IHS facilities since 2006.

Federal watchdogs found some IHS hospitals failed to follow opioid prescribing protocols, thus increasing overdose risk. or properly use prescription monitoring systems, increasing overdose risk. 

One of the largest scandals involved pediatrician Stanley Patrick Weber, who sexually abused Native American boys for years while working at IHS facilities in Montana and South Dakota. Investigations found senior officials were warned repeatedly but failed to remove him. The federal government later paid major settlements to victims, including an $18 million settlement reported in 2025.

During COVID-19, IHS purchased millions of dollars in KN95 masks from a company linked to former White House official Zach Fuentes. The agency later tried to return the masks after determining they did not meet FDA standards.

Many IHS hospitals and clinics are decades old and severely outdated. Reports describe unsafe buildings and broken equipment.

In 2025, reports emerged that some IHS officials restricted or reviewed vaccine-related public messaging, leading some physicians to accuse the agency of censorship and politicization of public health communication. 

Tribal leaders and former healthcare workers have long said that IHS suffers from chronic understaffing, high turnover rates, and bureaucratic dysfunction. The IHS is so bad that several tribes have shifted toward tribally-operated healthcare systems under self-governance agreements, arguing they can provide better care locally.

All the IHS issues make me wonder what their role was in 1993. Were they serving the tribes well, or was the lure of research money too great to pass up?

In Conclusion

While writing this article, I wondered whether there had been any other outbreaks similar to the 1993 Four Corners hantavirus outbreak, and not to my surprise, there were really none that were comparable. No mystery outbreaks of the same scale, and no other reservation-centered outbreaks. Instead, there were a few public health outbreaks that did affect tribal communities, but there has never been a second cluster outbreak like the one in 1993 on tribal lands. Instead, sporadic cases have been reported. The public health outbreaks were a 2009 flu pandemic that disproportionately affected Native communities. Of course, vaccination campaigns were heavily prioritized for tribal health systems. Between 2010 and 2019, some tribal communities experienced measles outbreaks linked to broader U.S. measles resurgences. Naturally, cases were tied to under-vaccination clusters, and the CDC along with the Indian Health Service enacted rapid response vaccination campaigns.

Certainly, COVID-19 had one of the most significant modern impacts on tribal nations. In fact, the Navajo Nation had some of the highest per-capita infection rates early in the pandemic. Once again, the Indian Health Service played a central role in expanded surveillance and vaccination distribution.

In conclusion, the Four Corners outbreak is best known for permanently changed US emerging infectious disease research priorities—and funding. It provided a research framework for later viruses like SARS, COVID-19, West Nile virus, bird flu and other spillover diseases.

And when you know what we know now, the Four Corners 1993 outbreak seems like it was the catalyst for all the government-funded bioweapons that are now being unleashed on us.