| Bluetongue virus (5) |  |
| Flaviviruses (7) | |
| Influenza (18) | |
| Retrovirus (8) | |
| Rhabdovirus (6) | |
| Bluetongue virus (5) | |
| Flaviviruses (7) | |
| Influenza (18) | |
| Retrovirus (8) | |
| Rhabdovirus (6) | |
The discovery solves a century-old mystery about bluetongue virus and is particularly significant as climate change brings more moderate winter temperatures.
They documented for the first time the presence of genetic material for the bluetongue virus in female midges that were collected during two consecutive winter seasons.
The bluetongue virus was widespread in both the dairy cows and the midges from August to November.
The researchers concluded that those long-lived female midges had been infected with the bluetongue virus during the previous warm-weather season.
The bluetongue virus may also have other yet-to-be discovered modes of overwintering in temperate regions the researchers say.
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