>As you can imagin, this is a possibility that was explored in SF. There was a novel by Frank Herbert (better known as the author of "Dune"), about one guy who designed a disease that killed only women. Not sure about the title, "The White Death" it might be.
>
>>I thought the McDonalds menu at McDee's website was computer bio-warfare state of the art, but this trumps it!
>>
>>http://www.sianews.com/modules.php?name=News&file=article&sid=1990

You're right. This topic has been examined several times in SF.

I wish I could remember titles............

Robert Heinlein, in one of his worst (least very good?) books wrote about a USA which had been conquored by "Oreintals." A beam weapon was developed which would target only "Orientals."

Recently Ben Bova had a series (topic is Industrial Warfare in the Asteroid Belt) in which "nanobots" typically used for industrial processes but also capable of working inside the human body could be used to enhance the human immune system. They were also capable of being programmed as weapons.

I'm sure there are others out there.