Antibiotics can feel like a modern fix, the kind you pick up after a doctor visit. So why would a bacterium that has been frozen since around 3000 BC already know how to survive them?<\/p>\n\n\n\n
According to a study <\/a>published February 17, 2026, scientists found that Psychrobacter<\/em> SC65A.3, recovered from an ancient ice layer, resisted 10 modern antibiotics in lab tests. The result suggests that many drug-evading tools<\/a> existed in nature long before people started making antibiotics, and it hints at a possible upside for future treatments.<\/p>\n\n\n\n The bacterium came from Scarisoara Ice Cave in Romania<\/a>, a place where ice has built up for millennia in darkness. Researchers drilled an ice core about 82 feet long, roughly 25 meters, from an area known as the Great Hall, pulling up a layered record that acts like a frozen archive and covers roughly 13,000 years.<\/p>\n\n\n\n To reduce the chance of contamination, the ice was handled under sterile conditions and kept sealed during transport. It stayed frozen until it reached the lab, because even a small amount of modern bacteria could confuse the results.<\/p>\n\n\n\n Scientists then isolated living strains from an ice layer estimated to be about 5,000 years old. In everyday terms, that is like finding a working gadget in a box that has not been opened since the Bronze Age.<\/p>\n\n\n\n Once SC65A.3 was growing in the lab, the team challenged it with a lineup of medicines used in hospitals today. Psychrobacter<\/em> bacteria are adapted to cold environments, and some can cause infections. The strain was tested against 28 antibiotics from 10 broad families of drugs, a mix that reflects what doctors rely on for serious infections.<\/p>\n\n\n\n SC65A.3 resisted 10 of those antibiotics, meaning the drugs did not stop it under standard lab measurements. The tested medicines include ones used for infections of the urinary tract, lungs, skin, blood, and parts of the reproductive system, which is why the finding lands so close to real life.<\/p>\n\n\n\n The researchers also sequenced its genome, the full set of DNA instructions inside the microbe, to see what might explain its toughness. They found more than 100 genes linked to antibiotic resistance, along with genes that help the bacterium cope with cold conditions and other stressors. <\/p>\n\n\n\n The work was led by microbiologist Victoria Ioana Paun and included collaborators at the University of Bucharest<\/a>.<\/p>\n\n\n\n Antibiotic resistance is when bacteria no longer respond to drugs meant to kill them. It does not mean a bacterium is smarter than humans, just that it has traits that help it survive. Those traits often come from small genetic changes in the bacterium\u2019s DNA.<\/p>\n\n\n\n Over time, survivors multiply, and the resistant traits spread. The process speeds up when antibiotics are used too often or used the wrong way, including when people stop a prescription early because they feel better.<\/p>\n\n\n\n Health agencies have been warning for years that this is not a niche problem. The World Health Organization<\/a> estimates bacterial antimicrobial resistance was directly responsible for 1.27 million deaths worldwide in 2019 and was linked to nearly 5 million deaths in the same year.<\/p>\n\n\n\n The idea that resistance is ancient is not brand new, but the ice cave strain is a vivid example because it is alive and testable. A 2011 paper in Nature<\/em><\/a> reported resistance genes in ancient DNA from permafrost<\/a>, ground that stays frozen year-round, roughly 30,000 years old, long before modern antibiotics existed.<\/p>\n\n\n\n That earlier work supports a simple point that is easy to miss. Many microbes naturally make antibiotic-like chemicals to compete with neighbors, so other microbes have spent eons evolving defenses.<\/p>\n\n\n\n In that light, human medicine did not invent resistance, but it can amplify it. Modern antibiotic use acts like a powerful filter that favors bacteria already equipped with the right survival tools.<\/p>\n\n\n\n Why does an ancient ice cave bacterium matter today, beyond the wow factor? One reason is that frozen environments can store microbes and their genes, and warming temperatures can change how often those materials enter modern ecosystems.<\/p>\n\n\n\n Researchers caution that this is not the same as predicting a wave of prehistoric infections. Still, resistance genes can sometimes move between bacteria, and any new source of those genes is worth understanding, especially in a world where drug options are already shrinking.<\/p>\n\n\n\n Recent surveillance underscores how tight things are getting. A 2025 report summary shared through the Pan American Health Organization<\/a> said one in six laboratory-confirmed bacterial infections worldwide in 2023 were resistant to antibiotic treatments, and resistance rose in more than 40% of the monitored antibiotics between 2018 and 2023.<\/p>\n\n\n\n This discovery is not only about risk, and that is where the story gets interesting. Cristina Purcarea, a senior scientist at the Institute of Biology Bucharest of the Romanian Academy, said studying microbes preserved in cave ice shows “how antibiotic resistance evolved naturally in the environment” and can also reveal useful biology.<\/p>\n\n\n\n In the genome of SC65A.3, the researchers reported around 600 genes with unknown functions, a reminder of how much basic biology is still unexplored. In lab experiments, it also slowed several antibiotic-resistant “superbugs”<\/a> linked to hospital infections. <\/p>\n\n\n\n They also identified 11 genes that may help inhibit or kill other bacteria, fungi, and viruses, which is the kind of raw material drug developers look for when the current toolbox starts to fail.<\/p>\n\n\n\n There is a long road from a Petri dish to a pill bottle, and most leads do not pan out. But learning how ancient microbes defend themselves, and how they sometimes attack competitors, could help scientists design new antibiotics or new enzymes that work well at cold temperatures.<\/p>\n\n\n\n The main study has been published in Frontiers in Microbiology<\/em><\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":" Antibiotics can feel like a modern fix, the kind you pick up after a doctor visit. So why would a … <\/p>\nIce cave time capsule<\/h2>\n\n\n\n
Putting the strain to the test<\/h2>\n\n\n\n
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