Conversation so far:
What was the Judith Miller anthrax hoax about?
On October 12, 2001, Miller opened an anthrax hoax letter mailed to her New York Times office. The act was a copycat hoax of the 2001 anthrax attacks.
Who was the anthrax hoax letter to Judith Miller mailed from?
The most likely suspect was Bruce Ivins.
Why was the anthrax hoax letter mailed to Judith Miller ?
The exact reasons is unknown, but the letters were sent for political or revenge related reasons.
What was the content of the anthrax hoax letter mailed to Judith Miller?
Some letters had messages with deadly powder and some had harmless white powder inside.
Were there any deaths due to 2001 anthrax attack letters?
There were five deaths.
Are there any other significant details about the 2001 anthrax letters case besides the suspect, motive, letter content, and deaths?
Dozens of buildings were contaminated with anthrax as a result of the mailings.
Why was only Judith Miller targeted with an anthrax letter ?

Question: How much were the other news networks affected by this ?
Self-contained rewrite: How much were the other news networks affected by the 2001 anthrax letters?