What illness did Bubba Offenhaus come down with in alas Babylon?

In "Alas, Babylon" by Pat Frank, Bubba Offenhaus suffers from a severe case of pneumonia. This illness arises after the nuclear war devastates the community, leading to a collapse of medical resources and infrastructure. His condition highlights the challenges faced by the characters as they struggle to survive in a post-apocalyptic environment. Ultimately, Bubba's illness serves as a reminder of the fragility of life and the impact of societal breakdown on health.