Division of Virology, National Institute for Medical Research, The Ridgeway, Mill Hill, London NW7 1AA, UK. jstoye@nimr.mrc.ac.uk
Koalas are currently undergoing a wave of germline infections by the retrovirus KoRV. Study of this phenomenon not only provides an opportunity for understanding the processes regulating retrovirus endogenization but may also be essential to preventing the extinction of the species.