New Tick-Borne Virus Identified: ALTNV Linked to Flu-Like Illness in Patients

In a significant finding, scientists from the State Key Laboratory of Pathogen and Biosecurity in Beijing have identified a novel tick-borne virus, now known as the Asian longhorned tick nairovirus (ALTNV). This discovery was reported in the New England Journal of Medicine and arises from efforts to investigate unexplained flu-like symptoms in patients who test negative for the more commonly known Dabie bandavirus (DBV). Such veiled illnesses compel researchers to expand their focus beyond the usual suspects, revealing what could become an important aspect of public health in tick-infested regions.

Dabie bandavirus is notorious for causing severe fever with thrombocytopenia syndrome (SFTS), a potentially fatal illness with a mortality rate that can reach up to 30%. Given the rising cases of unexplained symptoms, researchers aimed to better understand the etiology of these instances, prompting the collection of blood samples from individuals who had been bitten by ticks in areas where tick-borne diseases are documented. This proactive approach may not just illuminate the origins of these symptoms but also reshape how clinicians diagnose tick-related illnesses, especially in endemic regions.

Discovery of ALTNV

Through the use of RNA sequencing and viral isolation techniques, the research team successfully detected the new virus. Genetic comparisons positioned ALTNV within the orthonairovirus genus of the Nairoviridae family, establishing its distinct classification, as its proteins share under 80% amino acid similarity with other known species. This classification gives ALTNV its own identity, firmly placing it in the complex web of tick-borne pathogens that researchers now need to evaluate.

In a systematic study involving 3,163 patients, 10.4% presented evidence of ALTNV infection indicated by positive tests for viral RNA or immunoglobulin M antibodies. That’s a notable statistic, especially when you consider the likely underreporting of such infections. Notably, among those who were negative for DBV, the prevalence of ALTNV was even higher at 15.1%. Symptoms predominantly included fatigue (reported by 84%), gastrointestinal issues (80%), and thrombocytopenia in 38% of cases, while 36% showed elevated liver enzymes, indicating potential liver stress. The similarity of these symptoms to those of DBV may complicate accurate diagnosis, resulting in under-treatment of affected patients. Fortunately, patients generally recovered fully, but the long-term implications of infection remain unclear.

Impact of Coinfections

Alarmingly, the researchers also documented instances of coinfection, finding 38 patients carrying both ALTNV and DBV. Those affected by both viruses exhibited more severe outcomes, with 61% displaying respiratory complications and 84% experiencing kidney issues, compared to 38% and 66% of those infected solely with DBV, respectively. The mortality rate within this coinfected group stood at 18.4%, with seven deaths recorded. These figures raise a red flag about how coinfections can produce an exponentially greater health crisis, especially in populations already vulnerable to severe tick-borne diseases.

Tick Vector and Transmission Risks

To further understand the transmission dynamics, researchers examined over 47,000 ticks across 15 provinces, finding ALTNV RNA present in 1.3% of the specimens, with the highest prevalence in the Asian longhorned tick (Haemaphysalis longicornis). Laboratory experiments confirmed this tick species's capability to transmit ALTNV to mice, hinting at its potential as a vector for human infections. This research lays the groundwork for tracking the spread of ALTNV and other related pathogens in specific ecological zones and may underscore the importance of public health measures in preventing bites from this particular tick species.

The frequent co-circulation of ALTNV and DBV, coupled with their shared tick vector, highlights an urgent need for enhanced diagnostic approaches in regions where SFTS is prevalent. If you're working in this space, you know that existing methods may not be equipped to handle the complexities arising from these two viruses. With the evidence suggesting significant overlap in symptomatology and coinfection outcomes, distinguishing between the two diseases is becoming increasingly critical in clinical settings. This underscores an essential truth: healthcare practitioners must be vigilant, particularly in geographic areas predisposed to tick-borne illnesses.

Public Health Implications

The emergence of ALTNV should be a wake-up call regarding the broader implications of tick-borne diseases. As climate change alters habitats and tick ranges expand, the likelihood of encountering new pathogens increases significantly. This isn't just an academic concern; it involves real-world public health risks that can put communities in jeopardy. Monitoring and researching emerging pathogens like ALTNV is now essential for preventing potential outbreaks before they spiral out of control.

As the research continues, it will be pivotal for healthcare professionals to remain vigilant regarding these emerging tick-borne pathogens and their implications for public health. The rising number of cases necessitates improved surveillance and research into effective diagnostics and treatments, which could drastically alter outcomes for those affected.

Materials provided by CIDRAP. Original written by Mary Van Beusekom, MS. Note: Content may be edited for style and length.

Don’t Miss: Saturn, Halley’s Comet Meteors and the Seven Sisters Light Up October

Scientists Discover 5 Hidden Forms of a Liver Disease Affecting 30% of Adults

Could Vitamin C Help Stop Leukemia Before It Starts?

Study Finds Natural Dairy Trans Fats Behave Very Differently From Industrial Fats

Stay informed with ScienceDaily's free email newsletter, updated daily and weekly. Or view our many newsfeeds in your RSS reader:

Keep up to date with the latest news from ScienceDaily via social networks:

Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?