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>>bookof+(OP)
Honest question here: how is a worm (parasite) considered a "disease"? I Googled this question two different ways and got two different responses.

>>I_drea+332
The parasite is not the disease; the parasite causes the disease.

Similarly, SARS-COV-2 is a virus which causes Coronavirus Disease 2019 (COVID-19) and the Human Immunodeficiency Virus causes AIDS.

People often conflate parasites or viruses with the diseases they cause, and it's practically impossible to eliminate the diseases without eliminating the causative agent, but they are technically distinct concepts.