Commonly known as the brain worm, Parelaphostrongylus tenuis infects a large range of wild and domestic herbivores ...

White-tailed deer host these brain worms, but they don’t actually get the disease, which makes it harder for biologists to monitor its prevalence.

The New Hampshire Department of Health and Human Services said laboratory test of the spring on Old Franconia Road detected both Giardia and E. coli bacteria.