🧬 New emerging tick-borne virus explains mysterious flu-like illnesses
In an important scientific discovery, a team of researchers in China has uncovered a new tick-borne virus that may be the cause behind thousands of illnesses of unknown origin, with symptoms including fever, fatigue, gastrointestinal symptoms, and unusual laboratory abnormalities.
Scientists named the new virus Asian longhorned tick nairovirus (ALTNV), and it belongs to the genus orthonairovirus within the family Nairoviridae. This discovery comes in the context of the search for the causes of diseases spreading in certain areas of China, where some patients suffer from symptoms similar to tick-borne hemorrhagic fever, but their clinical test results were negative for the disease known as Dabie bandavirus (DBV).
🧪 The search for the cause: distinguishing a new virus amid easily confused diseases
DBV is associated with a serious condition called “Severe Fever with Thrombocytopenia Syndrome – SFTS,” which can lead to a mortality rate ranging from 10% to 30%. SFTS causes high fever symptoms with a drop in platelets, which are important blood cells that stop bleeding.
The research efforts focused on a group of more than 3,000 patients in hospitals monitoring areas where tick viruses spread in China. Through advanced tests such as RNA sequencing and virus isolation, the researchers were able to detect the presence of a new, unknown virus.
In addition to genetic safety, laboratory experiments showed that the virus can replicate in human cells, and the researchers identified the virus using the immunofluorescence technique, while electron microscope images confirmed its characteristics consistent with orthonairoviruses.
🩺 Patterns and signs of infection with the new ALTNV virus
The study results showed that 10.4% of the patients included in the study were positive for ALTNV, based on the presence of viral RNA or Immunoglobulin M antibodies indicating a recent infection.
A larger proportion of patients who were not confirmed to have DBV were positive for ALTNV, reaching 15.1%.
- The most common symptoms among those infected with ALTNV were fatigue (84%).
- Gastrointestinal problems (80%) appeared, ranging from abdominal pain and diarrhea to other symptoms.
- Thrombocytopenia (38%) was a clear laboratory sign among them.
- Elevated liver enzyme markers such as aminotransferases, which indicate inflammation or injury in the liver or other tissues, were observed in 36% of the cases.
Despite these symptoms and the decline in some laboratory values, all patients infected with ALTNV recovered fully.
🧠 Effects of co-infection: worsening symptoms when infected with two viruses at the same time
The researchers found 38 patients co-infected with both ALTNV and DBV, and the results were interesting in terms of symptom severity.
- They noted a greater recurrence of respiratory symptoms in double-infection cases (61%) compared with those infected with DBV alone (38%).
- Kidney function impairment was more common in co-infection cases at 84%, compared with 66% for those infected with DBV alone.
- The death rate among those infected with both viruses together reached 18.4%, which is higher than what is known for the single-infection strain.
These findings indicate that co-infection may increase the risk of serious clinical outcomes, which calls for close medical follow-up in regions where these viruses are widespread.
🌱 The spread of the new virus in the tick environment and its ability to transmit
The scientific team analyzed more than 47,000 ticks collected from 15 provinces across China. They found that 1.3% of these samples were positive for ALTNV.
The highest prevalence of the virus was in the tick species known as Haemaphysalis longicornis, or the “Asian longhorned tick,” where the infection rate reached 1.8%.
In conclusion, laboratory studies showed that this tick species is capable of transmitting the virus to mice, confirming its role as a biological vector for ALTNV.
Given the presence of ALTNV and DBV in the same regions and their spread through the same tick species, the researchers emphasize the importance of developing accurate diagnostic methods that distinguish between these two viruses to avoid misdiagnosis and contribute to better healthcare.
🩺 Conclusion: The importance of awareness and ongoing research in the field of tick viruses
ALTNV represents a new challenge in understanding tick-borne diseases. Its discovery provides a clear explanation for mysterious illnesses and encourages the need to develop more precise laboratory tests that distinguish between similar viruses that can cause potentially life-threatening diseases.
In light of these findings, ongoing research and medical vigilance in tick-affected regions strengthen our ability to confront these diseases, improve the quality of diagnosis and treatment, and reduce possible complications associated with infection by multiple viruses at the same time.
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