Mysterious Fog in the US , Canada and UK: A dense, eerie fog with a "burning chemical-like smell" has spooked a good part of North America and parts of the United Kingdom and Canada. With social media amplifying all concerns, this phenomenon has sparked attention across all social media platforms. However, at the heart of this mysterious fog are a conjunction of natural events, social psychology, and environmental conditions that culminated in all the conspiracy theories and public health fears. Here's a closer look at the mysterious fog, its potential causes, and the societal response it has triggered.

Fog that Feeds Fear

The first reports of this "mysterious fog" came in from Florida where a resident said that they experienced respiratory symptoms, feverish warmth, and stomach cramps after contact with the fog. Similar stories started flooding social media, and within a day or two, a sinister force seemed to sweep across the United States, Canada, and parts of the UK. From Texas to Minnesota, people reported weird odors and health issues that they thought were linked to this bizarre atmospheric event.

Some witnesses were said to see "white particles" swirling through the air; theories ranged from a chemical attack or experimental weapon to drone-related chemical dispersals and references to historical military experiments, such as the infamous 1950s "Operation Sea-Spray."

Fuel to the fire were added when videos and posts, hundreds of thousands in number, began circulating on social media sites like TikTok and X (formerly Twitter) speculating on the origin of the fog. Hashtags like #ToxicFog went trending for days. Hysteria created a self-reinforcing loop in which every post spurred further scrutiny and fear.

Scientific Explanation of the Dense Mysterious Fog

1. What is Fog?

Fog is essentially a low-lying cloud formed when the air temperature cools to its dew point, causing water vapor to condense into tiny droplets or ice crystals. Several types of fog—advection fog, radiation fog, and valley fog—can form depending on conditions such as warm, moist air moving over cooler land or when temperatures plummet rapidly under clear skies.

2. Why the Chemical Smell?

Such chemical-like smell as reported during the occurrence of fog events is sometimes attributed to air pollution. It acts like a sponge, where it absorbs these pollutants, which include sulfur dioxide and nitrogen oxides, among others, that emit from industries. This mixture, therefore, leads to a stench that could be mistaken as unnatural or even toxic.

Also Read: Health Concerns Rise As US, Canada, and UK Come Under The Blanket Of Thick, Dense, Toxic Fog

3. What are the Health Concerns?

High moisture levels from fog can significantly exacerbate symptoms related to respiration, but especially in already predisposed asthmatics and allergy patients. The connection of these symptoms with actual fever, stomach cramps, and puffy eyes is too remote. Experts assume that the irritating effects of entrapped pollutants trapped in fog tend to affect more the eyes and throat rather than the rest of the body affected by some report.

Psychological Effects of Mass Panic Caused by Social Media

Social media amplified a natural weather event into a health epidemic. It made the personal experience of individuals become a cause for fear and speculation, a domino effect.

According to psychologists, this is a concept of selective perception, wherein once people's attention is drawn to environmental anomalies, they begin to notice them. This mirrors earlier panics, such as the Seattle windshield pitting panic of 1954. Then, atomic bomb testing caused fear in many and started to have people looking at their windshields for small marks that they had not seen before. Likewise, postings on the strangeness of the fog probably increased public awareness and suspicion, with people looking to attach unrelated symptoms to the phenomenon.

The fog hysteria shares a commonality with other instances of mass panic, such as the "drone sightings" of recent years or the Cold War-era fears of biological warfare.

Also Read: Mysterious Fog Is Making Americans Sick

These events underscore how fear can cloud judgment, especially when amplified by social media and sensationalist headlines. While historical cases, such as "Operation Sea-Spray," offer concrete evidence of the existence of unethical experiments, the jump from a natural weather condition to theories of chemical attacks exemplifies a more modern trend of connecting unrelated dots, all wonderfully seeded in distrust and anxiety.

Despite the swirling rumors, meteorologists and scientists are in agreement that the mysterious fog is not as alarming as it seems. It is well known that fog traps and amplifies pollutants, especially in urban and industrial regions. Moreover, winter months are the most conducive for fog formation, so its recent prevalence is unsurprising.

On the other hand, environmentalists advise that the fog should wake everyone up to increased levels of pollution. The reported odors and health irritations could be just symptoms of far deeper systemic issues like industrial emissions and lack of control over air quality.

The authorities must be transparent in their communication to combat misinformation and allay public fears. Governments and environmental agencies must provide timely updates on weather phenomena, air quality, and health risks. Initiatives like real-time pollutant tracking and public education campaigns can help demystify natural occurrences while addressing valid environmental concerns.

The mysterious Canada fog is a compelling case study in how environmental events intersect with psychology and societal dynamics. While rooted in natural phenomena, the fog became a vessel for collective fears, amplified by modern technology and historical anxieties.

In this information era where communication occurs at an almost lightning pace, the fog becomes a metaphor that reminds everyone about scientific literacy, environmental responsibility, and an effective balance when considering public concern. Whether perceived as a marvel of nature or as a tale that serves to teach, it left a very powerful mark in people's minds.

The US Food and Drug Administration (FDA) has approved Tivicay PD tablets for oral suspension (dolutegravir) to treat HIV infection in babies.

Developed by ViiV Healthcare, Tivicay and Tivicay PD were previously approved for adults and children older than four weeks.

Now, Tivicay PD has been approved for newborns from birth up to four weeks of age weighing at least 2 kg, in combination with other antiretroviral agents.

How Does Tivicay Work?

Tivicay and Tivicay PD contain dolutegravir, an integrase strand transfer inhibitor used in combination with other antiretroviral agents to treat HIV.

Integrase inhibitors inhibit HIV integrase by binding to the integrase active site and blocking the strand transfer step of retroviral deoxyribonucleic acid (DNA) integration, which is essential for the HIV replication cycle.

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What’s The Evidence For Tivicay PD In Newborns?

The FDA approval was based on data from the IMPAACT 2023 study, in which 48 newborns exposed to HIV-1 and weighing at least 2 kg received Tivicay PD from birth for up to six weeks, in combination with standard-of-care antiretroviral medications to prevent mother-to-child HIV transmission.

The newborns were followed for 16 weeks. Results showed that Tivicay PD drug levels in newborns were similar to those associated with efficacy in adults.

Importantly, the drug’s safety profile in newborns was also similar to that observed in older pediatric and adult patients.

FDA Priority Review

Read More: Reducing Mother-To-Child HIV Transmission To Zero Key To End AIDS In India: Experts

In June, the FDA accepted a supplemental new drug application (sNDA) for Tivicay PD that would extend its use to newborns from birth. The agency granted the application Priority Review with a PDUFA action date of August 25, 2026.

"Early HIV treatment can help shape a child's future, yet newborns have historically had the fewest age-appropriate treatment options," said Jean van Wyk, chief medical officer at ViiV Healthcare, at the time.

Who Should Avoid Tivicay or Tivicay PD?

Patients should not receive Tivicay or Tivicay PD if they have had previous allergic reactions to the drug or if they are also receiving dofetilide.

Serious allergic reactions have been reported. Patients should be monitored for liver damage. Immune reconstitution syndrome has also been reported in patients treated with combination antiretroviral therapy.

Taking Tivicay or Tivicay PD with certain other medications may cause the drug to stop working against HIV or lead to serious side effects. Patients or their caregivers should tell their healthcare provider about all medications they are taking before starting Tivicay or Tivicay PD.

Tivicay tablets and Tivicay PD tablets for oral suspension are not substitutable on a milligram-per-milligram basis.

What Is HIV?

HIV (human immunodeficiency virus) attacks the body's immune system, increasing the chances of developing serious infections or cancer. Without treatment, HIV can lead to AIDS (acquired immunodeficiency syndrome).

There is no cure for HIV, but prevention and treatment options are available.

Preventing Mother-to-Child HIV Transmission

Pediatric HIV remains a global issue, with children disproportionately affected by the HIV epidemic. The latest statistics show there are 1.7 million children living with HIV, and the majority of AIDS-related deaths among children still occur during the first five years of life.

Major obstacles persist for children, such as continued mother-to-child transmission, the availability of HIV testing, slow initiation of treatment, and poor availability of optimized pediatric formulations of antiretrovirals, according to UNAIDS.

An HIV-positive mother can pass the virus to her baby during pregnancy, labor, delivery, or breastfeeding, but proper medical care lowers this risk to less than 1%.

The deaths of three patients in experimental gene-editing and cell-therapy trials in China, including two children, have raised grave concerns about patient safety, transparency and oversight in the country's clinical-trial system.

The three deaths occurred in separate investigator-initiated trials (IITs), which are studies led by researchers or medical institutions rather than conducted through the conventional drug-development pathway.

The cases have come to light only months after the deaths, prompting US lawmakers to ask the FDA to scrutinise clinical data generated in China more closely.

Three Patients Died In Separate Experimental Trials

One case involved a 6-year-old girl with Snijders Blok-Campeau syndrome, a rare neurodevelopmental disorder. She died seven days after receiving an experimental gene-editing treatment at Xinhua Hospital in Shanghai in May 2025.

Reports said the treatment was delivered into the spinal fluid, and the hospital's ethics board later determined that the death was definitely related to the treatment.

A second death involved a boy with Duchenne muscular dystrophy (DMD) who received HuidaGene Therapeutics' experimental CRISPR-based therapy. He died in August 2025 after developing acute respiratory distress syndrome (ARDS) during a severe immune reaction following a high dose of the viral-vector treatment. The company disclosed the death in August 2026 after questions from reporters.

The third case involved a man in his 50s with scleroderma, who died in March 2026 after receiving RiboX Therapeutics' experimental in-vivo CAR-T therapy.

RiboX had announced FDA clearance to begin testing the treatment in the US shortly before the death became public.

Also read: Early Trial Examines A One-Time Treatment That Could Replace Statins To Manage High Cholesterol: Study

Why Gene Therapy Can Trigger Serious Reactions?

High doses can further increase this risk. In the HuidaGene case, the child developed ARDS during what the company described as a severe immune reaction. Such reactions can cause widespread inflammation and damage organs, making them potentially life-threatening.

Gene editing also carries another category of risk: the treatment is intended to alter genetic material, so researchers must carefully assess whether editing occurs only at the intended target and whether the delivery system itself creates additional risks.

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Bigger Concern Is Trial Oversight

The deaths have attracted particular attention because they occurred in trials initiated by investigator, which have historically offered researchers a faster route to testing experimental therapies.

Unlike conventional clinical trials, these studies have operated under a different regulatory framework in China. Reports have raised concerns about whether independent safety monitoring was adequate in some cases.

For example, the HuidaGene trial did not have an independent data safety monitoring board, according to reporting by STAT. The study enrolled four boys, and the child who died was the fourth participant to receive treatment and received the highest dose administered in the trial.

US Lawmakers Are Calling For Greater Scrutiny

The cases have prompted Representatives John Moolenaar and Ben Cline to ask the FDA to stop accepting Chinese clinical-trial data for US drug applications unless the agency has recently inspected the trial site.

In a letter to Acting FDA Commissioner Kyle Diamantas, the lawmakers said, “American families deserve confidence that the treatments approved in our country are supported by data produced with rigor, ethics, and accountability.”

At least 1 in 4 former NFL players who died between 2016 and 2021 had chronic traumatic encephalopathy (CTE), according to a new study published in the BMJ. Researchers say the figure may be a conservative estimate, raising concerns about the long-term effects of repeated head impacts in American football.

The study examined 878 former NFL players who died during the six-year period. Of them, 235 had donated their brains for research, and 215, or 91.5%, were found to have CTE.

As brain donation was not available for everyone who died, researchers calculated that at least 24.5% of the entire group had CTE. Researchers say the actual number could be substantially higher.

What Is CTE?

Repeated head impacts can cause abnormal accumulation of tau protein in the brain. Over time, these changes can damage and kill brain cells, particularly in areas involved in memory, thinking, mood and behaviour.

The damage is not always caused by one dramatic concussion. Researchers focus on the cumulative burden of repeated head impacts, including hits that may not cause obvious concussion symptoms.

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Brain Damage Can Build Up Over Years

CTE can be associated with symptoms including memory problems, confusion, impaired judgement, depression, anxiety, aggression and difficulties controlling impulses.

The new study also found a strong relationship between more advanced CTE and dementia. Among players with the most severe, Stage IV disease, dementia was particularly common.

Dr Daniel Daneshvar, a neurologist at Mass General Brigham and lead author of the study, said, "Former NFL players had about a fourfold higher risk of dying from neurodegenerative disease compared with the general population."

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The Risk May Begin Before The NFL

One important finding is that the brain injury associated with CTE does not necessarily begin during an NFL career.

Players may accumulate thousands of head impacts during childhood, high school and college football, before ever reaching the professional level.

Researchers therefore say prevention needs to focus on reducing repetitive head impacts throughout a player's sporting career, rather than concentrating only on professional football.

This also explains why researchers distinguish between concussions and repetitive head impacts. A player can experience numerous hits without being diagnosed with a concussion, yet the cumulative exposure may still have a lasting impact in long term.

Can CTE Be Detected Or Treated While Someone Is Alive?

One of the biggest challenges is detecting CTE while someone is alive. There is currently no definitive test that can diagnose CTE during life and no cure that can reverse the underlying brain changes.

Researchers are studying biomarkers and brain-imaging techniques that could eventually make diagnosis possible without an autopsy. The treatment focuses on managing symptoms like depression, sleep problems, headaches, cognitive difficulties and behavioural changes.