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Comment by Dr. Krishna Kumari Challa on Wednesday

The most common pneumotype—accounting for almost half (49%) of cases—was characterized by immune suppression, significant damage to the lining of the lungs and bleeding in the alveoli (tiny air sacs within the lungs). There were fewer signs of inflammation, which may explain why treatments targeting inflammation can fail or even harm some patients.

The second pneumotype—accounting for just under a quarter (23%) of cases—was characterized by a balanced immune response and active repair of damage to the lungs. Patients were most likely to recover faster from this pneumotype and require the shortest time on the ventilator, even though they initially looked just as ill as the others.

Patients with the most dangerous pneumotype—the one that most resembles "classic" pneumonia—spent the longest on mechanical ventilation and had prolonged critical illness. They had severe and persistent inflammation, with a flood of immature immune cells in the lung. This group may be most likely to respond to anti-inflammatory therapies, the research team said.
Severe pneumonia is not a single disease, but several biologically distinct conditions that happen to look alike. This helps explain why 'one-size-fits-all' treatments—including some immune-modulating drugs—have often failed in clinical trials.

The tests used to determine the pneumotypes are too complex to enable rapid classification, but the researchers hope to develop a simplified tool that could help them stratify the patients and ultimately offer tailored treatments.

Pulmonary inflammation in severe pneumonia is characterised by compartmentalised and mechanistically distinct sub-phenotypes, Nature Communications (2026). DOI: 10.1038/s41467-026-74190-x

Comment by Dr. Krishna Kumari Challa on Wednesday

Discovery of 3 severe pneumonia subtypes could lead to tailored treatments

Pneumonia is the most common infectious cause of death worldwide, responsible for an estimated 2.5 million deaths a year. In severe cases, patients may need to be admitted to an ICU and given mechanical ventilation. Severe pneumonia accounts for six in 10 infections managed in intensive care, and spread of the infection within ICUs is a significant concern.
Severe pneumonia is usually diagnosed through a combination of symptoms, imaging and blood tests. Symptoms typically include fever or hypothermia, low oxygen levels, breathing difficulties and confusion.

Doctors have long struggled to understand why patients whose condition looks similar clinically can have very different recoveries. Some respond quickly to treatment, while others remain critically ill for weeks or even die.
Researchers have now shown that severe pneumonia has three different subtypes, helping explain why some patients in intensive care units (ICUs) recover from their illness faster than others, while for other patients the disease can be life-threatening.
Their findings could in future help inform tailored treatments, allowing individual patients to receive the most appropriate therapies.
Even though doctors are able to treat the initial infection, many patients with severe pneumonia still struggle to come off the ventilator and can develop lung failure. Therapies to tackle inflammation in the lungs have had mixed results in clinical trials—some suggest they are beneficial, others that they're harmful.
The current approach of classifying patients by their clinical syndromes—sepsis, acute respiratory distress syndrome and so on—without looking at the underlying biology risks missing what's key. Instead of asking 'Does this patient have pneumonia?' doctors should be asking 'What's the inflammatory pattern in this patient's lungs to correctly treat them?'"

Instead of relying only on blood tests or scans, however, the Cambridge team analyzed immune cells, inflammatory signals and gene activity in fluid taken from the lungs of the patients. They discovered that there are three distinct biological types—or "pneumotypes"—of severe pneumonia, none of which could be reliably detected using standard blood tests, even though they were strongly linked to how patients recovered.
Part 1

Comment by Dr. Krishna Kumari Challa on Wednesday

Spontaneous and voluntary laughter come from two different brain regions, researchers reveal
Laughter is a universal social signal that connects us with others.
In a review published in Trends in Neurosciences, researchers analyze reports from medical procedures in which the brain is electrically stimulated in awake patients. Laughter can be an unintentional byproduct of these stimulations, allowing scientists to pinpoint laughter-evoking brain areas.

By examining these reports and other clinical and animal studies, the authors describe two distinct networks in the brain for laughter: one that elicits spontaneous outbursts, and another that produces voluntary, conversational laughter.

Researchers have long observed two types of laughter in healthy humans.

Spontaneous, involuntary and sometimes uncontrollable laughter can be associated with certain types of seizure disorders, mood disorders, Alzheimer's disease and schizophrenia.
The second kind is volitional laughter. That's most of the laughter you encounter. It's timed incredibly precisely. If you look at people having a conversation, they will laugh together at the end of a sentence and then breathe together.

When people are talking to each other, volitional laughter starts and stops really quickly. This type of coordination points to a degree of control that is lacking in spontaneous laughter.

To tease apart the brain circuitry underlying these two types of laughter, the team turned to reports of presurgical brain stimulation in epilepsy patients. During these procedures, clinicians identify brain regions to target for surgery by electrically stimulating parts of the brain while patients are awake. These probes often unintentionally evoke laughter, and patients are able to describe their feelings in real time.

The authors analyzed these reports, along with other clinical and animal studies, to propose two distinct networks underlying spontaneous and voluntary laughter.

The spontaneous network consists of brain regions involved in motor control and emotional regulation, including the pregenual anterior cingulate cortex, nucleus accumbens and the temporal pole. Stimulating these regions produces laughter accompanied by enhanced mood, euphoria and mirth.

The voluntary network comprises areas involved purely in motor control of laughing and smiling, such as the rolandic operculum, globus pallidus and presupplementary motor area. Stimulation of these regions evokes laughter without positive emotions.

The authors suggest that the spontaneous network is a more evolutionarily ancient pathway that arose in animal "rough-and-tumble" play, with laughter-like vocalizations serving as a signal to prevent aggression and promote social bonding. This hypothesis is consistent with recent discoveries that several mammalian species produce laughter-like vocalizations during social interactions.

The voluntary network, on the other hand, overlaps with brain regions that produce speech, supporting the idea that it controls more purpose-driven, conversational laughter.

The neural basis of laughter, Trends in Neurosciences (2026). DOI: 10.1016/j.tins.2026.05.002

Comment by Dr. Krishna Kumari Challa on June 23, 2026 at 11:32am

Mars-like conditions fail to kill some Earth pathogens, experiments suggest

Microorganisms from our planet could survive on celestial bodies where water is present, such as Mars. That is the conclusion of researchers after experiments with simulated space conditions. Our immune system reacts less effectively to pathogens that have undergone such a simulated space journey.
Earth extremophiles, especially yeasts, withstand simulated lunar, Martian, and icy moon conditions via enhanced DNA repair and protective responses. Human pathogens such as Klebsiella pneumoniae survive Mars-like exposure, become smaller, and elicit weaker immune cell responses. Simulated lunar and Martian regolith damage lung barriers and promote infection more than terrestrial sand.
Researchers also studied several well-known human pathogens, such as the bacterium Klebsiella pneumoniae, which can cause pneumonia. They observed that these pathogens shrank after a simulated trip to Mars, yet survived it. In laboratory experiments, immune cells from human blood responded less strongly to these shrunken pathogens.

This is important news for astronauts, who already face declining health in space and must therefore be extra cautious about infections. Space travel places heavy strain on the immune system because of the lack of a normal day-night rhythm, poor diet, disrupted gut function, DNA damage from radiation, limited social interaction and confinement in a small space.
In addition, astronauts must be wary of dust (regolith) from the moon and Mars.
Material from Mars, and even more so from our moon, damages the protective layer of the lungs and causes infections. Earth material usually does not.

Tommaso Zaccaria, Dissertation title: Life beyond Earth: microbial survival and immune health in space. Supervisors: Prof. Dr. M.G. Netea and Prof. Dr. M.I. de Jonge. Co supervisors: Dr. P. Rettberg and Dr. K. Beblo Vranesevic (both German Aerospace Center, Germany).

Comment by Dr. Krishna Kumari Challa on June 23, 2026 at 11:13am

Jumping gene caught moving between species in first direct observation

Genes are not passed on exclusively from parents to their offspring. Some are mobile and can also jump to other species, as researchers have now shown. The direct observation of a jumping gene provides the first evidence that such genes can transfer from one species to another—from predator to prey. The study is published in the journal Scientific Reports.

Jumping genes are parasites in the genetic material of bacteria, plants, animals and humans. They are released into the cell as small RNA molecules from ribonucleic acid (RNA) and possess complex mechanisms for inserting themselves into other parts of the genetic material within the cell, thereby often conferring new properties on the cell and accelerating evolution. There are also jumping genes that free themselves from the RNA using an RNA enzyme. These ribozymes, or self-splicing introns, are a special group of jumping genes.

It is more difficult for a gene to jump into another cell or another species. Phylogenetic analyses of genes show that such jumps have taken place. Until now, it had been assumed that, for this to happen, the jumping genes traveled as 'hitchhikers' in the genomes of plasmids or viruses. Now,  researchers have made  this surprising observation.

Mobile self-splicing intron RNA from the predatory bacterium Candidatus Velamenicoccus archaeovorus was directly visualized in both predator cells and dead Methanothrix soehngenii cells, demonstrating horizontal transfer from predator to prey. The intron persists as stable circular RNA, indicating a plasmid- and virus-independent route for interspecies gene transfer that can accelerate microbial evolution.

Jana Kizina et al, Mobile intron RNA from a bacterial predator accumulates in dead archaeal cells, Scientific Reports (2026). DOI: 10.1038/s41598-026-51721-6

Comment by Dr. Krishna Kumari Challa on June 21, 2026 at 10:45am

Nonsurgical procedure provides lasting relief for knee pain, finds study

Osteoarthritis is the most common form of arthritis. It causes inflammation, stiffness, reduced mobility and sensory nerve pain. According to the World Health Organization, knee osteoarthritis affects more than 365 million adults worldwide and is one of the leading contributors to disability.

Embolization of abnormal blood vessels using rapidly resorbable gelatin-based microspheres is safe and provides significant, lasting pain relief and functional improvement for patients with osteoarthritis-related knee pain, according to a new study published in Radiology.
Genicular artery embolization (GAE) is an emerging minimally invasive treatment that targets abnormal blood vessels using superselective embolization.

In an osteoarthritic knee, these abnormal vessels build up around the joint and drive inflammation and pain. During GAE, an interventional radiologist guides a thin catheter directly to each affected vessel and injects tiny particles to block it, calming the inflammation and easing the pain without surgery.
In their trials, researchers noticed a significant drop in pain and a significant increase in function, including sports and recreation and daily activity.
"Most importantly, their quality of life significantly increased."
Genicular artery embolization with rapidly resorbable gelatin microspheres in 194 patients with knee osteoarthritis was technically successful in all 239 procedures, with only mild, self-limited adverse events in 6.7%. Pain scores decreased from 7 to 3 over 12 months, functional and quality-of-life scores improved beyond clinically important thresholds in 80%, indicating durable, clinically meaningful benefit.

Florian Nima Fleckenstein et al, Genicular Artery Embolization Using Rapidly Resorbable Gelatin-based Microspheres for Osteoarthritis-related Knee Pain, Radiology (2026). DOI: 10.1148/radiol.253312 , pubs.rsna.org/doi/10.1148/radiol.253312

Comment by Dr. Krishna Kumari Challa on June 20, 2026 at 2:23pm

Fish oil supplements may not prevent Alzheimer's-related decline, clinical trial suggests
A two-year randomized, placebo-controlled trial in 365 older adults at elevated Alzheimer’s risk found that 2,000 mg/day DHA increased cerebrospinal fluid DHA by 17% but did not improve cognition or memory, nor prevent hippocampal atrophy. Results do not support high-dose fish oil supplements for Alzheimer’s prevention; broader lifestyle measures remain primary for risk reduction.

eBioMedicine (2026). www.thelancet.com/journals/EBI … (26)00198-2/fulltext

Comment by Dr. Krishna Kumari Challa on June 20, 2026 at 2:21pm

Bending forward and walking a lot at work may raise miscarriage risk in early pregnancy

Bending forward and, to a lesser extent, walking a lot at work in early pregnancy may raise the risk of miscarriage, finds a large study of more than 470,000 Danish women, published online in the journal Occupational and Environmental Medicine.
Each additional hour of bending forward, particularly at a 30-degree angle, was associated with a 36% higher risk, while each additional hour of walking was associated with an 18% higher risk, although the pattern was consistent only for bending forward, the findings show.

Miscarriage is relatively common, affecting around 15% of women. Risk factors include parental age, smoking, night shift work, and exposure to air pollution and various chemical compounds, note the researchers.

In >800,000 Danish pregnancies, occupational standing, walking, and especially forward bending in early pregnancy were associated with increased miscarriage risk. Each additional hour of bending ≥30° correlated with ~36% higher risk, walking with 18%, and standing with 3%, with a clear dose–response only for bending.

Occupational standing, walking and forward bending during pregnancy and the risk of miscarriage: a Danish nationwide, register-based, cohort study, Occupational and Environmental Medicine (2026). DOI: 10.1136/oemed-2025-110712

Comment by Dr. Krishna Kumari Challa on June 20, 2026 at 2:16pm

Animals communicate to work together across species boundaries

An international team of researchers have published a new review in Animal Behaviour revealing how communication enables cooperation between different animal species. The review, titled "The ecology and evolution of cues and signals in animal interspecies cooperation," highlights how movements, visual displays, calls, and other behavioural cues and signals help partners coordinate interactions and align interests across species boundaries.

From birds guiding humans to bees' nests in return for access to beeswax, to cleaner fish removing ectoparasites from larger reef fishes in exchange for a meal, cooperation between species occurs across a remarkable range of ecological settings. By gathering examples from birds, fish, insects and mammals, the authors highlight the diverse ways that animals exchange information to organize their actions and sustain mutually beneficial partnerships.

Communication via visual, acoustic, chemical, tactile, and multimodal cues enables interspecies partners to coordinate actions, access shared or exchanged resources, and limit exploitation. Signals range from stable, stereotyped displays to context-dependent, learned behaviours and can evolve from noncommunicative cues or behaviours in other contexts, illuminating the coevolution and flexibility of cooperative interactions across taxa.

Cues and signals help animals identify cooperative partners, initiate interactions, and ensure they benefit from the partnership. Because interacting with members of another species can carry risks, communication is also important for avoiding individuals that might exploit them.
Many species rely on multiple senses to improve communication, and the review suggests that focusing only on obvious visual signals may overlook important ways animals exchange information across species.
The review also explores how communication systems between species may evolve. Some signals begin as simple cues, features or behaviors that influence how others respond, even though they did not originally evolve for communication.

Over time, these cues can develop into clear signals. Other signals originate as behaviours used in different contexts, such as settling conflicts or caring for young, before being adapted for communication in interspecies cooperation.

K. Dunkley et al, The ecology and evolution of cues and signals in animal interspecies cooperation, Animal Behaviour (2026). DOI: 10.1016/j.anbehav.2026.123611

Comment by Dr. Krishna Kumari Challa on June 20, 2026 at 2:10pm

The Sun may not engulf Earth after all, scientists say

The Earth may not be engulfed by the expanding fireball of the dying sun, which has long been assumed to be our home planet's ultimate fate, according to scientists.
New tidal-dissipation models and constraints on solar mass loss suggest the Sun’s future expansion will likely not engulf Earth or Mars, as reduced tidal dissipation and stronger mass loss allow their orbits to expand beyond the solar radius. Mercury and Venus remain destined for engulfment, and the Sun will ultimately evolve into a cooling white dwarf.
Don't worry: This is not expected to happen for another 5 billion years, long after all life on Earth has been wiped out.

When the sun burns through all of the hydrogen in its core, it will go through two immense expansion phases: first becoming a red giant, then, when its helium is spent, an "AGB" star.

This fiery death will bring about some significant changes back here on Earth.

As the sun grows, increasing gravitational forces will pull the Earth toward it.

For the Earth and the moon, this force creates the push and pull of the tides in our oceans. The energy from these tides, which dissipates at the bottom of the ocean, slows Earth's rotation and gradually pushes the moon away from us.

As the sun expands and its blistering surface approaches Earth, intense tidal waves will stir within the star. When they dissipate, they will pull Earth into its doomed embrace.

However, the growing sun will also lose a lot of its mass due to stellar wind, which pushes our planet farther away.

"Earth's fate depends on a delicate balance between these two effects," say the scientists.
If tidal interactions predominate, Earth is engulfed by the sun. If the sun's mass loss predominates, Earth escapes into an orbit larger than the radius of its star.

M. Esseldeurs et al, The fate of Earth during the Sun's giant phases, Astronomy & Astrophysics (2026). DOI: 10.1051/0004-6361/202660576

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