Which term describes a group of helminths that affect human health?

The term that describes a group of helminths affecting human health is "parasites." Helminths are a specific type of parasite, which are generally large, multicellular organisms often visible to the naked eye and include worms such as tapeworms, roundworms, and flukes. They live in or on a host and can cause various health issues in humans ranging from mild to severe conditions.

Parasites are organisms that derive their nourishment and habitat from another organism (the host) and can disrupt the host's normal physiological functions. This distinction is important because it emphasizes the nature of the relationship—the host can suffer harm from the presence of these parasites.

In selecting this term, it's essential to differentiate it from the other categories listed. Viruses are much smaller infectious agents that require a living host cell to replicate, while fungi and bacteria also represent distinct biological categories. Fungi are primarily decomposers and can be pathogenic but are not classified under helminths, and bacteria are unicellular organisms that can also be harmful but are not helminths. Thus, "parasites" is the most accurate term for the group of helminths concerning human health.