Fungi can be true pathogens that cause infections in healthy people or they can be opportunistic pathogens that cause infection. Parasites – they are either plant or animal organisms that live in or on another and take their nourishment from that other organism.
In contrast with the saprotrophic fungi, parasitic fungi attack living organisms, penetrate their outer defenses, invade them, and obtain nourishment from living cytoplasm, thereby causing disease and sometimes death of the host. Most pathogenic (disease-causing) fungi are parasites of plants.
Bacteria and viruses can live outside of the human body (such as on a countertop) sometimes for many hours or days. But parasites need a living host to survive. Bacteria and parasites can often be killed with antibiotics. But these medicines can't kill viruses.
Such fungi as Endothia parasitica, Ceratocystis ulmi, Puccinia sparganioides, Puccinia graminis are parasites of plants, while fungi of the genus Aspergillus or Candida albicans carry infections to the human organisms.
What causes each infection, and who's at risk? Simply put, a yeast infection is fungal in nature, whereas BV is bacterial. An overgrowth of Candida fungus causes yeast infections.
Candida is a yeast-type fungus and thus classified as Ascomycota fungi. Most fungi are either saprotrophs or parasites.
The Basidiomycota include an immense variety and number of fungi in the most advanced of all fungal classes. There are several thousand species known all of which are obligately parasitic on higher plants.
Bacteria and viruses can live outside of the human body (such as on a countertop) sometimes for many hours or days. But parasites need a living host to survive. Bacteria and parasites can often be killed with antibiotics.
A parasite is an organism that lives on or in a host organism and gets its food from or at the expense of its host. There are three main classes of parasites that can cause disease in humans: protozoa, helminths, and ectoparasites.
They are similar to obligate intracellular parasites as they lack the means for self-reproduction outside a host cell, but unlike parasites, viruses are generally not considered to be true living organisms.