The ans is - Myxomatosis
What animal, introduced to Australia in the 19th century, had a feral population there by 2010 of between 500,000 and 750,000?
A potentially fatal haemorrhagic fever from a virus associated with Rousettus bat colonies was first detected in 1967 in simultaneous outbreaks in Belgrade in Yugoslavia (now Serbia), and Frankfurt, and where else in Germany?