What's that smell???

After ripping out just about everything in the basement, we thought the smells would go with it.  There was a musty smell that wouldn't go away. There was some standing water in the drain of the furnace room. We had the drain cleaned. Still smelly.

There was some flooring in Kyle's room that I thought was the same cheap Pergo as the kitchen. Turns out it was wood look VINYL. After some investigating, we figured out that the water heater in the furnace room next door had leaked-gone thru the wall (moldy under the baseboards) and underneath the vinyl-faux wood.  When we started pulling it up, we found the source  of the smellies. What kind of diseases do you get from breathing in mold spores?????