Yezo Virus: Japan Discovers New Virus That Spreads Through Tick Bites

Yezo Virus: Japan Discovers New Virus That Spreads Through Tick Bites

A previously undiscovered virus, which can infect human beings and cause sickness, has been found by scientists in Japan. The virus called Yezo is a tick bite transmitted virus that is directly to blame for the counteracting of alien substances and illness. The virus is symptomatic of fever and decreased levels of blood platelets and white cells.

A 41-year-old person who had fever and significant leg discomfort after being bitten by a tick while strolling in the Hokkaidos Forest was hospitalized in 2019, leading to the discovery of the new virus.

 “At least seven people have been infected with this new virus in Japan since 2014, but, so far, no deaths have been confirmed. All of the cases of Yezo virus infection we know of so far did not turn into fatalities, but it’s very likely that the disease is found beyond Hokkaido, so we need to urgently investigate its spread,” declared Matsuno.

In blood samples of the hospital patients with comparable symptoms admitted since 2014, the researchers continued to look for evidence of the virus. In at least five additional cases, they detected evidence of Yezo virus, all of which had high fevers, decreased platelets of the blood, and White Blood Cells. The individuals were also showing symptoms of hepatic abnormality.

The team has started the search for the new Yezo virus, the ancient name of the Japanese Hokkaido island where it was identified.

The researchers have identified evidence of Yezo antibodies in raccoons and Hokkaido Sika deer, which are endemic to the region while screening blood samples obtained from the wild for a period of ten years beginning in 2010. The scientists also identified Yezo RNA in 3 of the island’s leading tick species in northern Japan.


Tick bites are scary enough on their own, but they can also carry serious danger. Lyme disease, for example, is a serious illness that can be spread by ticks, and ticks infected with the bacterium that causes Lyme disease has been found in nearly every state. Lyme disease can spread to joints and organs, causing neurological symptoms, heart palpitations, headaches, and weakness.

Anna Daniels

Anna is an avid blogger with an educational background in medicine and mental health. She is a generalist with many other interests including nutrition, women's health, astronomy and photography. In her free time from work and writing, Anna enjoys nature walks, reading, and listening to jazz and classical music.

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