Travel can expose people to many valuable new experiences. It offers chances to see new sights, taste new foods, and meet new people. These opportunities may not exist in the same way at home.

However, travel can also expose people to new health risks. Many people in the United States view polio as a past disease. Yet, in some countries, polio transmission still occurs.

Recent reports show the polio virus appearing in several regions worldwide. Some common travel destinations, including the United Kingdom and Germany, now carry risk. In March 2026, the Centers for Disease Control and Prevention issued a level 2 travel notice.

A level 2 notice advises travelers to take extra precautions. It does not suggest canceling or avoiding nonessential travel. Polio continues to circulate across parts of Africa, the Middle East, and Europe.

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Sometimes important answers appear in unexpected and surprising places. People often find lost items hidden under cushions or inside drawers. Researchers discovered a similar surprise while studying vitamin D and COVID-19.

Scientists found regular vitamin D intake may reduce Long COVID risk. This finding came from researchers at Mass General Brigham. Their results were published in the Journal of Nutrition.

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When removing contamination, accidents can happen if people are not careful. For example, while dusting an antique bowl, someone might knock over a lamp. The lamp could fall and shatter into pieces.

A similar process can occur in the immune system. When the body responds to infection, mistakes sometimes occur. These errors can trigger cascading negative health effects.

Researchers from University of California, San Francisco recently investigated a link between Epstein–Barr virus (EBV) and Multiple sclerosis (MS). This finding is important because EBV is extremely common. About 96 percent of people become infected during their lifetime. Most infections occur during childhood and cause few symptoms.

In some cases, EBV causes infectious mononucleosis, often called “kissing disease.” MS is a chronic autoimmune disease of the central nervous system. In MS, the immune system attacks myelin surrounding nerve fibers. Myelin is a fatty, protein-rich layer that protects nerve signals. Nearly one million Americans currently live with MS.

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False convictions in criminal cases can cause serious harm. Similar damage can occur when false narratives spread about disease origins. Conspiracy theories, misinformation, and distrust of medicine often follow these claims. A recent study examining viral evolution offers new insight into how many pandemic viruses emerge.

The research focused on pandemic viruses. Specifically, it examined how they acquire their ability to infect humans. This can occur naturally or through laboratory manipulation. Many pandemic viruses are zoonotic. These viruses originate in animals before spreading to people. Some public claims argue that certain viruses gained their human infectivity through laboratory work. However, the study’s findings challenge that idea for most major outbreaks.

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Typhoid fever is an old bacterial illness that still threatens global health. Many people in developed nations assume the disease disappeared long ago. Yet this belief is mistaken because the bacterium never vanished worldwide. Instead, the disease remains common in many developing nations today.

Typhoid fever is caused by the bacterium Salmonella enterica serovar Typhi. The bacterium spreads through contaminated food or drinking water. Poor sanitation and unsafe water systems allow the infection to circulate widely. As a result, many regions still experience frequent outbreaks of the disease.

Researchers warn that typhoid fever is becoming more difficult to treat. A 2022 study published in The Lancet revealed troubling new trends. Scientists found that many S. Typhi strains are gaining resistance to antibiotics. This discovery raises concern because antibiotics remain the only effective treatment.

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