Beginner Gardening: Basil (Albahaca) disease. Help!, 1 by Albahaca

Albahaca wrote:
Hi,
I have different types of basil and all of them have gotten this infection that leads to massive leaves death.
This problem starts being a little black spot that expands in one day to look like a gray star with a black spot in the center. The gray star becomes in a same shape blister. I have separated this blister from the leaf and I could see the black spot stuck to the leaf and all the surface inside this blister looks shiny and moist.
Please take a look in detail following this link:
http://farm3.static.flickr.com/2245/2431563808_0e5a380bfa_b....

I will appreciate if some of you could please give me some advice to restore my plants to health.
Thanks a lot, I hope I don't have to burn them all.