The third pandemic is a good book about a variety of diseases, including bird flu, mingling in a host (bird) body, morphing into a superbug, and wiping out huge swaths of the population.

If you like to read, it’s quite good, if a bit long. (but notably I read it in 5th grade and hauled around a dictionary for a lot of it… it sticks hard in my memory, because my step dad gave it to me after finishing it himself, and it was a challenge. One of our few shared positive things from the era where he almost killed me multiple times… but I haven’t read it in a hot minute; just shy of 30 years…)