Danger decoded

A virus with a 90 percent fatality rate and other shocking truths

Most people have heard of viruses like Ebola or dengue, but few know how these got their names, where they first appeared, or whether science has found ways to stop them. One virus has claimed up to 90 percent of those infected, while another may be hiding closer to home than expected. These are the deadliest viruses in the world, and what you need to know about them.

Marburg virus is not very well-known, but it is probably one of the deadliest viruses identified. Despite its reputation and its 90% fatality rate, it’s extremely rare.

Marburg was first recognized in 1968 after laboratory workers in the German cities of Marburg and Frankfurt, along with Belgrade in what was then Yugoslavia, became seriously ill while handling African green monkeys for medical research. The virus, named after the city where investigators first identified the outbreak, causes a severe form of hemorrhagic fever that leads to sudden illness, intense weakness, and bleeding inside and out. The fatality rate can reach 90 percent, and there’s still no widely approved cure, although supportive hospital care greatly improves survival, and several vaccines remain in clinical testing.

Many people first learned about Ebola through dramatic news reports in the 1990s, and again during the Large West African outbreak a decade ago. However, the virus had been discovered in 1976, during simultaneous outbreaks in what are now the Democratic Republic of Congo and South Sudan.

The virus was named after the Ebola River, in an attempt by researchers to spare residents from lifelong stigma. Researchers believe fruit bats serve as the virus’s natural host, with occasional transmission to humans through infected wildlife before spreading between people. Outbreaks often start in remote areas, then move outward when people travel for work or health care. There are several species, but the Zaire strain has caused the deadliest outbreaks. Today, there’s no universal cure, but an effective vaccine protects against the Zaire strain, and antiviral treatments have significantly improved survival when patients receive care quickly.

Cleaning out an old garage or shed is a common thing for many; however, few realize it can carry an unexpected risk. Hantavirus refers to a family of viruses that naturally infect rodents and can spread to people when dust contaminated with rodent droppings becomes airborne.

The disease first drew worldwide attention following the Korean War in the early 1950s, when soldiers developed Korean Hemorrhagic Fever. The virus, isolated and discovered as "Ebola" by doctor Ho Wang Lee in the 1970s, was named after South Korea’s Hantan River, where many of those cases occurred. In the U.S., a deadly outbreak in the Four Corners region during 1993 introduced Americans to Hantavirus Pulmonary Syndrome. There’s no currently approved vaccine or specific cure, making prevention through rodent control and careful cleaning the best defense.

Every few years, headlines warn about bird flu, and with good reason. Bird flu, or avian influenza, is one of the strains of influenza, and some of them can be deadly. H5N1, the best-known strain, has a high fatality rate, yet it rarely infects people.

Even if the first reports of the virus date back to 1878, the first human infections occurred in Hong Kong in 1977, when animal-to-human transmission led to 18 human infections and six deaths. Although H5N1 has a high fatality rate among infected people, human infections remain rare because they usually require close contact with sick poultry. Scientists named the strain using the virus’s H and N surface proteins, a system used for all influenza viruses. Several vaccines have been developed for emergency cases, and antiviral medication can reduce the severity of the illness if given early.

Most people never think twice about a mouse running through a barn or pantry, but in parts of West Africa, rodents can spread a disease that has challenged doctors for decades.

The Lassa virus was first identified in 1969 after two missionary nurses died from a mysterious illness in the town of Lassa, Nigeria, which gave the virus its name. Scientists later discovered that the multimammate rat is its natural host, shedding the virus in urine and droppings that can contaminate food and household surfaces. In some cases, the infection can cause mild symptoms or none at all, while others progress to severe fever and organ damage. Several vaccines are being tested, but none are yet licensed. Doctors often use an antiviral drug called ribavirin in severe cases, especially when the treatment begins early.

A simple fever during harvest season might not sound alarming, but in parts of Argentina, it has long been treated with extra caution. Junin virus, named after the city where it was first discovered in 1958, causes Argentine hemorrhagic fever.

Scientists traced the first outbreaks among agricultural workers exposed to infected field mice, and while early symptoms may resemble the flu, the illness can later cause severe damage, neurological problems, and dangerously low blood pressure. Researchers made remarkable progress by developing an effective vaccine called Candid #1, which has dramatically reduced cases in high-risk areas. Early treatment with immune plasma from recovered patients has also improved survival.

A tick bite is usually nothing to worry about, but in some parts of the world, it can carry a virus that demands immediate medical attention.

Crimea-Congo hemorrhagic fever was first described in soldiers and farmers in Crimea in 1944. Years later, scientists discovered that the same virus had been identified in the Congo, leading to the combined name still used today. The disease spreads mainly through Hyalomma ticks or contact with infected animal blood, making farmers, vets, and slaughterhouse workers especially vulnerable. Symptoms often begin with fever and muscle ache before progressing to bleeding in severe cases. No licensed vaccine is widely available, and treatment relies mainly on supportive hospital care while researchers continue searching for better therapies.

The remote grasslands of Bolivia may seem an unlikely place for a dangerous virus to emerge, yet that is exactly what happened in the early 1960s.

Machupo virus was discovered after an outbreak of Bolivian hemorrhagic fever near the Machupo River in the Beni Department of Bolivia. Dr. Karl Johnson found that a native field mouse serves as the virus's natural reservoir, allowing it to circulate in rural communities. Named after the river, the virus causes high fever, weakness, and bleeding that can become life-threatening without prompt care. Person-to-person transmission has also been documented, making outbreaks especially challenging to contain. Considering there’s no approved vaccine, supportive treatment and careful infection control have proved the best defense against this deadly virus.

For people who enjoy hiking or spending time outdoors, tick bites are always worth avoiding. In the forests of Karnataka, India, they can occasionally spread Kyasanur Forest Disease, named after the place and first identified in 1957, after monkeys began dying in the region.

It is carried mainly by ticks, while monkeys act as important warning signs because outbreaks among them often appear before human cases. Those infected usually experience high fever, severe headaches, muscle pain, and, in some cases, bleeding complications. India has developed a vaccine for people living in high-risk areas, although repeated booster doses are needed, and avoiding tick bites remains the most effective protection.

Going on a holiday to tropical places usually includes getting vaccinated against dengue fever on the checklist. While the disease has been recognized for centuries, the name’s origin remains a mystery. It’s believed to come from a Swahili expression describing the sudden, cramp-like pain caused by the illness.

In the 1940s, the virus itself was recognized as a mosquito-borne infection that was becoming a growing global concern. Today, dengue is found across much of Latin America, Southeast Asia, and other tropical regions where billions of people live at risk. Most patients recover after several uncomfortable days of fever, rash, and severe joint pain. Vaccines are now available in certain countries for specific groups of people, while mosquito control and insect repellent remain the best protection.

The truth about your brain

You won’t believe what happens in your brain while you sleep

Image: Milad Fakurian

Your brain is one of the most powerful and mysterious organs in your body. It controls everything from your thoughts to your emotions and even processes information at lightning speed. But how much do you really know about it? Some long-believed myths about the brain have been debunked, while other surprising facts reveal just how incredible this organ truly is. Get ready to be amazed by these fascinating brain facts!

Image: Natasha Connell

You’ve probably heard this one before, but it’s completely false! While it’s true that not all parts of the brain fire at the same time, imaging studies show that most regions are active throughout the day, even when we sleep.

Your brain is constantly working, controlling bodily functions and emotions, and processing information. So next time someone says you’re only using 10% of your brain, you can confidently tell them that’s just a myth!

Image: Aarón Blanco Tejedor

Here’s a weird fact: While your brain processes pain signals from the rest of your body, it has no pain receptors of its own. This is why surgeons can perform brain surgery on conscious patients without causing them pain.

However, the membranes and tissues surrounding the brain do have pain receptors, which is why headaches and brain injuries can be so excruciating.

Image: Usman Yousaf

How come we have headaches if the brain has no pain receptors? Well, that’s because headaches are triggered by chemical activity in the brain, changes in nerves and blood vessels, and even fluctuating serotonin levels.

In some cases, hormones like estrogen can also play a role, which explains why migraines are more common in women.

Image: Go to Johannes Plenio's profile Johannes Plenio

Dreams are proof that your brain never rests! (Warning: this fact can make you feel exhausted.) While you sleep, your limbic system, that is, the part of the brain that deals with emotions, becomes especially active, which is why dreams often feel so intense.

On average, humans experience four to seven dreams per night, even if we don’t always remember them. And what about that scary nightmare about falling? Well, you can thank your amygdala, the brain’s fear center, for that one.

Image: Brett Jordan

Have you ever walked into a room and instantly forgotten what you were after? That’s because short-term memory only lasts about 20-30 seconds! That’s not enough!

Your brain holds a limited amount of information in its active state before deciding whether to store it or discard it. Ironically, we can’t really choose what makes the cut, but we do hope these facts stay with you!

Image: BUDDHI Kumar SHRESTHA

That sharp, icy pain when you eat something too cold? It’s your brain’s way of telling you to slow down! Officially called sphenopalatine ganglioneuralgia, a brain freeze happens when cold food or drinks rapidly chill the blood vessels in your throat, causing them to constrict and then rapidly expand. This sends pain signals to your brain, warning you of the sudden temperature shift. It’s annoying, but it’s actually your body trying to protect itself!

Image: Josh Riemer

You didn’t need us to tell you, but let’s look at the details: The average person has between 12,000 and 60,000 thoughts per day. What’s even more interesting? 95% of those thoughts are the same ones you had yesterday. Is that not surprising enough? Hear this out: 80% of them tend to be negative. That’s because our brains are wired for survival, constantly analyzing risks and potential dangers.

Image: Terry Vlisidis

Even though it only makes up about 2% of your body weight, your brain employs a major quantity of energy! It consumes 20% of your oxygen and blood supply, making it one of the most demanding organs in your body.

If your brain goes without oxygen for just five minutes, brain cells start dying, leading to irreversible damage. This is why deep breathing and cardiovascular exercise are great for brain health!

Image: Alexander Andrews

Do you know that feeling when you hit the back of your head and see stars? That’s because your occipital lobe, which controls vision, is located at the back of your brain. If you get hit there, your brain momentarily misfires, causing flashes of light.

Interestingly, your brain processes vision on the opposite side; while your right brain controls your left eye, your left brain controls your right eye. It’s one of the many ways the brain operates in a complex way.

Image: Rodion Kutsaiev

Believe it or not, your brain generates between 12 and 25 watts of electricity when you’re awake. If you can’t really grasp how powerful that is, check this out: It’s enough to power a small light bulb! Your brain’s electrical activity is what allows neurons to send signals at speeds of up to 260 miles per hour.

Image: Robina Weermeijer

Your brain may be the fattiest organ in your body, consisting of at least 60% fat! This is why consuming healthy fats, like omega-3s and omega-6s present in fish, for example, is essential for brain health.

Healthy fats stabilize brain cell walls, reduce inflammation, and support cognitive function. So go ahead and enjoy that avocado toast, it’s food for your brain!

Image: Robina Weermeijer

It’s not just your memory that fades over time; the brain itself physically shrinks as one gets older. It continues developing until your late 40s, but after that, it slowly decreases in size.

Now, size doesn’t equal intelligence, so a smaller brain doesn’t necessarily mean a less capable one. Staying mentally active, exercising, and eating brain-boosting foods can help keep it in top shape!

Image: Lisa Yount

We often think of cholesterol as bad, but your brain actually depends on it! In fact, 25% of your body’s cholesterol is stored in your brain, where it helps with learning and memory. However, unlike other organs, the brain can’t absorb cholesterol from the blood, it has to produce its own. So, while too much cholesterol in the body can be harmful, the right amount is vital for brain function. At least you can use that as an excuse to get that burger!