What are the effects of parasites on a community?

there are far to many ways a parasite can effect a host not only on animals but also on humans they can live inside you for years and you would not know it until in the the last stages of its lives where it is still the same strength or bigger than that parasite as to begin with if you want more knowledge on this potentially life threatening project watch a programme on YouTube or t.v it is called :

monsters inside me

it helps with useful facts that could help you or others healthy but for now take care of yourselves and each other :)

love ~Pj~