This passage from the aforementioned work by John DiConsiglio was written to C.to add supplemental information that explains the situation
The passage in question:
These are all supporting information that aim to give more insight into bird flu and what it does.
We can therefore conclude that the passage was written to provide supplementary information to understand the scenario.
Find out more on "When Birds Get Flu" at https://brainly.com/question/18173200.