In part 1, we learned that avian flu is killing birds globally in record numbers, has crossed the species barrier to animals, and could pose a global threat to humans from a COVID-like virus if unchecked. Advances in CRISPR gene editing might lead to the development of genetically engineered poultry that would be resistant to the deadly H1N1 flu virus, protecting birds and mammals. But unscientific regulatory barriers are blocking its potential.