Human Milk 4 Human Babies is an amazing resource and their Community Page puts you in direct contact with donors in your area. (ohbabynutrition.com)
Typically, influenza is transmitted through direct contact with other infected animals. (vet.osu.edu)
Even if your rabbit never comes into direct contact with animals from the wild, it can still become infected with this disease. (brittonroadveterinaryclinic.com)