[O]ne particular insect virus can sterilise crickets, but also change their behaviour so they continue to mate with each other. By doing so, they pass the virus on to uninfected hosts.
[Shelley] Adamo’s team first noticed the virus when some of the female crickets in their lab stopped laying eggs. They dissected the uncooperative insects and found that their fat bodies—organs that store fat and make proteins – were swollen and blue. Under a microscope, these organs were loaded with viruses.
Still, the males actually became quicker to court nearby females and the females continued to mate with them. These continuing hook-ups don’t benefit the crickets. But the virus, which turned out to be sexually transmitted, gets an easy ride into fresh, uninfected hosts.