Logical Strategy: Casework

Frankenstein, Dracula, The Mummy, The Wolfman, Dr. Jekyll, and The Bride of Frankenstein all go into a dark costume closet, which they know contains 10 hats which are perfectly identical except that 5 are blue and 5 are red. They each put on a hat but they don't know what color their own hat is. After they all come out of the closet, they try to deduce what color their own hat is, by looking at one another. $$\\$$ Dracula says: "I don't know what color my hat is." $$\\$$ The Mummy echoes: "I also don't know what color my hat is." $$\\$$ Dracula asks out loud: "Do any of you know what color your hat is now?" $$\\$$ All five of the others simultaneously answer "No". $$\\$$ If each one has perfect logic and reasoning skills, based on all of the information, how many people are now sure what color their hat is?