Breakthrough Research Found the Oldest Cold Virus Genome Ever

Researchers have long studied ancient viruses by examining preserved DNA fragments. DNA survives relatively well in bones, teeth, and other remains. Because of this stability, scientists have discovered viral DNA that is tens of thousands of years old. Some DNA viruses identified in ancient human remains date back nearly 50,000 years. These discoveries help researchers trace how diseases evolved and spread through early human populations.

RNA viruses present a far greater challenge. RNA molecules are fragile and degrade quickly after death. In most cases, RNA dissolves within hours once cells begin to break down. This instability makes it extremely difficult for scientists to detect ancient RNA viruses. As a result, the evolutionary history of many RNA viruses has remained largely unknown.

A recent study, however, uncovered evidence of a much older RNA virus than previously confirmed. Researchers identified fragments of a rhinovirus, the virus responsible for many common colds. The virus infected a woman who lived roughly 250 years ago. This discovery represents the oldest RNA virus genome ever reconstructed from human remains.

How Did Researchers Study Rhinovirus RNA?

Advances in genetic sequencing helped make the discovery possible. Modern sequencing techniques can analyze extremely small fragments of genetic material. Researchers can now assemble partial strands and reconstruct the original genome. Even tiny pieces of RNA can provide valuable clues about ancient infections.

Scientists have recently demonstrated this capability in other studies as well. One research team successfully sequenced RNA from a woolly mammoth preserved in Arctic permafrost. The mammoth had been dead for more than 40,000 years. Its preserved tissue contained fragments of RNA that researchers could still analyze. These findings proved that RNA can sometimes survive far longer than scientists once believed.

The rhinovirus discovery relied on preserved lung tissue samples. These samples are housed at the Hunterian Anatomy Museum at the University of Glasgow in the United Kingdom. The tissues came from historical medical collections created centuries ago. Unlike most modern specimens, the tissues had been preserved in alcohol rather than formalin.

This preservation method turned out to be crucial. Formalin has been widely used since the early twentieth century to preserve biological tissues. While formalin prevents visible decay, it severely damages RNA molecules. Alcohol preservation, however, can slow deterioration while leaving some RNA fragments intact.

Researchers analyzed two preserved lung samples in the museum’s collection. One came from a London woman who died in the late eighteenth century. The second belonged to a person of uncertain sex who died in the late nineteenth century. Both individuals showed signs of severe respiratory illness.

The scientists extracted extremely small RNA fragments from the tissues. Most fragments measured only two to three percent of the virus’s full genome length. Despite their tiny size, these fragments contained enough information for reconstruction. By combining overlapping sequences, researchers rebuilt the complete viral genome.

What Did the RNA Analysis Reveal?

Analysis revealed that the virus belonged to the rhinovirus A group. Rhinovirus A includes several strains responsible for common colds today. However, the reconstructed virus was not identical to any known modern strain. Instead, it appeared to be an extinct variant.

The closest modern relative is a strain called A19. This similarity suggests that certain rhinoviruses have circulated in humans for centuries. At the same time, it also shows how viral strains can gradually disappear or evolve into new forms.

The study also revealed additional pathogens in the lung tissue. Researchers detected bacterial species commonly associated with respiratory infections. These included Streptococcus pneumoniae, Haemophilus influenzae, and Moraxella catarrhalis. These bacteria often cause pneumonia or worsen viral respiratory diseases.

The presence of these microbes suggests the woman likely suffered from a severe respiratory illness. Viral infection may have weakened her lungs. Secondary bacterial infections could then have caused further damage.

This research represents an important milestone in the study of ancient disease. By recovering RNA from historical samples, scientists can reconstruct viruses that circulated centuries ago. These discoveries expand the timeline of viral evolution and help explain how pathogens change over time.

Understanding ancient viruses may also improve modern public health strategies. By studying past viral strains, researchers can better predict how viruses might evolve in the future. Each new discovery helps scientists piece together the long and complex history of human disease.

Conclusion

Researchers identified the oldest known RNA virus in preserved human lung tissue. The virus infected a London woman about 250 years ago. The discovery helps scientists study how respiratory viruses evolve over time.

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Logan Hamilton is a health and wellness freelance writer for hire. He’s passionate about crafting crystal-clear, captivating, and credible content that elevates brands and establishes trust. When not writing, Logan can be found hiking, sticking his nose in bizarre books, or playing drums in a local rock band. Find him at loganjameshamilton.com.