<unk> s are caused by<unk> s agents (pathogens) including: * Bacteria (Mycobacterium tuberculosis, Staphylococcus aureus, Escherichia coli, Clostridium botulinum, and Salmonella spp.) * Viruses and related agents such as viroids (HIV, Rhinovirus, Lyssaviruses such as Rabies virus, Ebolavirus and Severe acute respiratory syndrome coronavirus 2) * Fungi, further subclassified into: * Ascomycota, including yeasts such as Candida (the most common fungal<unk> , filamentous fungi such as Aspergillus, Pneumocystis species, and dermatophytes, a group of organisms causing<unk>  of skin and other superficial structures in humans. * Basidiomycota, including the human-pathogenic genus Cryptococcus. * Parasites, which are usually divided into: * Unicellular organisms (e.g. malaria, Toxoplasma, Babesia) * Macroparasites (worms or helminths) including nematodes such as parasitic roundworms and pinworms, tapeworms (cestodes), and flukes (trematodes, such as schistosomes) * Arthropods such as ticks,<unk> tes, fleas, and lice, can also cause human disease, which conceptually are<unk> milar to<unk> s, but invasion of a human or animal body by these macroparasites is usually termed<unk> estation. (Diseases caused by helminths, which are also macroparasites, are sometimes termed<unk> estations as well, but are sometimes called<unk> s.) * Prions (although they do not secrete toxins)
Infection
Sudden infant death syndrome
Disease
Methanol toxicity
Neurotoxicity
Trauma
Side effect
Malignancy