Sunday Special: Russia says no plague after a lab death

This is our Sunday science special. A lab worker's unexplained death in Siberia set off plague fears, and officials now say tests found nothing. We also look at the first working nuclear clocks, a very old tortoise, and three medical results that sound better than they are.

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SCIENCE SUNDAY

1. Russia says a suspected plague case in Irkutsk is over, but the cause of death is still not public. A woman who worked at the Irkutsk Anti-Plague Institute died on Oct 2. Rospotrebnadzor, Russia's health watchdog, first described it as "pneumonia of unknown etiology." The Buryatia governor said "possibly" plague, and an unofficial Telegram channel claimed pneumonic plague. Around Oct 7 the agency said it had finished its measures, that 5,000 lab tests found no dangerous pathogens, and that contacts showed no signs of illness. Reports put the number of contacts at about 200. The WHO is working with Russian authorities to verify the details, and its initial assessment rates the risk to Irkutsk as moderate to low and to the WHO European region as very low. Russia hasn't released the test details, so the official account is unverified, and some locals told ABC News they don't trust it.

2. Scientists sequenced the genome of Jonathan, a roughly 194-year-old tortoise, the oldest known land animal. The study in Science Advances found changes in genes tied to DNA repair, mitochondria, insulin regulation and telomeres. He carries 287 gene variants unique to him, some linked to tumor suppression, and in key regulatory regions his epigenetic disorder was lower than in all four comparison tortoises except a 5-year-old. The catch is the sample. It covers one old tortoise, and the lead author said "We cannot say for certain that what we found is the reason for his longevity." His age is also an estimate, based on his arrival on St Helena in 1882 as a fully grown adult.

3. Two teams, one at TU Wien in Vienna and one at Tsinghua University in Beijing, built working prototype nuclear clocks using thorium-229, and both are described in Nature. A laser is tuned to the frequency at which the thorium nucleus shifts between two energy states. Today they are worse than the best clocks. The Vienna prototype may drift about one second every 30 million years, roughly 10 times worse than the cesium clocks that define the official second, and the Beijing clock is reportedly about six times more stable than Vienna's. Researchers hope better lasers and crystals will eventually beat atomic clocks.

FROM THE FRONTIER

Sight, partly. A gene therapy paired with custom goggles improved light sensitivity in 7 of 10 people with retinitis pigmentosa, in a study in NEJM. Four of the eight who finished behavioral testing could find a doorway or follow a line. None could read words or see faces, and the approach needs a working optic nerve. One researcher calls it a proof of concept.

Cartilage, in mice. Stanford researchers blocked an aging-linked enzyme, 15-PGDH, and thickened worn knee cartilage in older mice. Cartilage from people with osteoarthritis also began regenerating in a dish after a week. The release says it does not yet show the treatment works in people. Several authors are inventors on patents licensed to Epirium Bio.

Belly fat, in a small trial. The experimental injection CBL-514 cut visceral fat about 12% at four weeks versus a gain of nearly 6% on placebo, in MRI scans from a subset of participants. The data were presented at a conference, the trials are small, and the report doesn't cover side effects.

The reframe. All three are real results, and none is a treatment you can get. Each one sits at a different early stage: a proof of concept, a mouse study, a conference slide. The honest question for any health headline is how far it is from a person like you.

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IN THE KNOW

A crocodile in the Sphinx's rock. A 45-million-year-old fossil from the limestone the Great Sphinx was carved from has been renamed Herugavialis cairensis, a new genus in the gavial family. A 1927 study had called it a Tomistoma, and 3-D X-ray scans of the skull changed that. Like the Sphinx, it's missing its nose.

Plague, in plain terms. Pneumonic plague affects the lungs and spreads person to person, but it is treatable with antibiotics if caught early. Per Newsweek's summary of WHO data, nearly 4,000 suspected cases were reported by 10 countries from 2019 to 2025.

Why a tortoise's age is hard to prove. Records for very old animals are scarce and ages of adult tortoises are difficult to determine. The study team also points to his tropical home and vet-managed diet as possible factors.

Why nuclear clocks matter. PopSci says better clocks could help in the search for phenomena like dark matter. Today's atomic clocks drift about one second every 300 million years, per the same report.

PROMPT STATION

Stress-test a health headline before you share it. Medical headlines skip the stage the research is at. This prompt puts it back.

Tip: run it on the three results in the Frontier section above as practice. You'll quickly see which answers the articles leave out.