sick

Tom Woodward/Flickr

Dr. Andrew Thompson is really frustrated.

He knows flu shots aren't perfect; he knows they're only 40-60% effective and that makes them hard to promote.

But the alternative, he says, can be worse.

Here's the thing about blue-green algae:  it's really a cyanobacteria.  You can't identify it by sight or smell, but it could make you sick.  Unless you're a dog, in which case, it could kill you.