Influenza B
A couple of days ago my sister left a message on my voice machine letting me know that she had been diagnosed with Influenza B. She announced this as if she had been diagnosed with some rare disease such as Brachial Plexus Neuropathy or Pick Disease of the Brain.
So yesterday evening I called her and let her know that I'd received her message about being sick.
She said: "Yeah. I was diagnosed with Influenza B."
I said: "Oh, so you've been sick with the flu, eh?"
She said: "No. Influenza B."