When researchers talk about their biggest bird flu fears, one that typically comes up involves an animal—like a pig—becoming simultaneously infected with an avian and a human flu. This creature, now a viral mixing vessel, provides the medium for a superbug to develop—one that takes the killer genes from the bird flu and combines it with the human variety’s knack for easy infection. When researchers talk about their biggest bird flu fears, one that typically comes up involves an animal—like a pig—becoming simultaneously infected with an avian and a human flu. This creature, now a viral mixing vessel, provides the medium for a superbug to develop—one that takes the killer genes from the bird flu and combines it with the human variety’s knack for easy infection. Veterinary medicine Phys.org – latest science and technology news stories