I'm sorry no one seems to have any information for you about this. I know that you should not feed orphaned baby birds fishing worms due to the bacteria that can be found in them.

I found this--Live foods will need special handling before feeding, including housing. Also, freshly caught, live food can introduce parasites into your tank.

Many worms, particularly tubifex worms and earthworms can carry debris, organic material and bacteria that can infect your tank. They must be washed very well before being fed to your fish. Some experts refuse to use tubifex worms, despite their high nutritional content, because of the diseases they can carry. If you choose to feed your fish tubifex worms, a good alternative to live worms is feeding freeze-dried worms, as that process removes a lot of the harmful bacteria that can be present.

Make sure all live foods are healthy. http://www.petco.com/Content/ArticleList/Article/18/3/542/Dangerous-Foods.aspx

I hope this helps.