2/6
In the first study, from a collaboration of researchers in northeastern China, 22 RNA viruses were identified from four tick species. 8 were novel and 1 was unclassified.

5 were known human pathogens that included Alongshan Virus, part of a group of segmented flaviviruses first identified in 2014. Robert Gifford explains more:
https://twitter.com/Paleovirologist/status/1494030027679223808

But the range of Alongshan Virus is much wider than just East Asia, as it has recently been detected in Switzerland:
http://doi.org/10.5281/zenodo.7403328

3/6
The first study also detected Tick Borne Encephalitis Virus (TBEV) among the 5 known human pathogens.

TBEV is a flavivirus that is found in northern latitudes across Eurasia, from England to Siberia.

The Siberian subtype seems particularly virulent, leading to a progressive brain infection that can cause death many years after infection.

4/6
In North America, the TBEV variants are known as Deer Tick Virus or Powassan Virus. The geographical range of these variants seems to be expanding southward, with infections reported as far south as Virginia, US.

The fact that these variants are transmitted by the same ticks that transmit #Lyme disease, as well as the fact that the symptoms are mostly identical to untreated Lyme disease, means that many human infections are undoubtedly misdiagnosed as Lyme disease.

5/6
In the second study, from a collaboration of researchers across China, 724 RNA viruses were identified from 31 tick species. Interestingly, they found that "more viral pathogens were detected in ticks from northeastern China compared with other areas."

The authors found that "41.5% of the viruses were +ssRNA viruses, 28.5% were −ssRNA viruses, 1.6% were dsRNA and 28.3% were unclassified viruses, suggesting the specific preference for +ssRNA in the tick virome."

6/6
The authors of the second study found differences in the virome of hard ticks vs. soft ticks, and investigated multiple factors that might explain the differences in tick viromes.

They also found similarities between the viral families found in ticks and the viral families found in other arthropods.

Using their findings, they develop theories on the historical evolution of the tick virome.

Hello @levampyre. In general terms, when we consider the ever-increasing interaction of human beings with wildlife, we are more likely to contact with the microbes in nature. Even worse, with the adverse affect of climate change, microbes (viruses, bacteria, fungi) broaden their distribution (remember the viral disease seen in Europe caused by flies which are normally seen in Southern Hemisphere) and due to glacier melting, microbes buried under the ice are also likely to arise++

@pyrrhus