Virus and fungi are different set of pathogens but the diseases caused by them are of obstinate and mostly of severe danger. Viral fevers, jaundice and colds are dangers from virus side and systemic infections (in blood) are dangerous ones from fungal side. Virus are non living entities which are particles having a set of genetic material either DNA or RNA with a protein capsule. They can act as parasites for their multiplication by taking over the machinery of the host cell. They can infect almost all the living cell i.e. plant cells, animal cells, bacteria, algae and even yeast cells. Fungi are multi-cellular but microscopic organisms which can act as parasite in the body leading to disease.
Diseases caused by virus in humans:
Skin diseases: Small pox, chicken pox.
Gums and buccal cavity: Mumps.
Respiratory tract: Colds etc.
Blood: Measles, AIDS, Dengu fever
Leaf mosaic: In tobacco, tomato, beans, chilli, brinjal etc.
Malformation of mango, leaf roll and curl in potato and papaya respectively.
They are treatable using anti-viral drugs to certain extent.
Diseases caused by fungi:
Most of the fungi damage foods, while some fungi like mush rooms are even consumed as foods.
But fungus can also diseases by infection. The infection by fungus is mostly two types like
External infection: This is mostly seen on the skin, nails etc. These are treatable and not so dangerous. They are sometimes influenced by seasonal changes and food habits of the patient.
Ex: They mostly cause ringworm like tenia pedis, candidiasis, (on skin, nails, foot, hands, groin etc.) on mucous membranes like oral, intestinal candidiasis, vaginitis, otomycosis (infection in ear).
Internal infection. These infections are systematic (i.e. in the blood), they are dangerous and life threatening. They can directly produce a disease by primary infection.
Ex: Histoplasmosis, cocidiomycosis
But in many cases the fungal infections are due to secondary infection as a side effect of anti-biotic therapy. The normal fungus present in the body is kept under control by vegetative body friendly bacteria. But when anti-biotics used to kill harmful bacteria in a disease condition are used, the normal friendly bacteria which keep fungi under control are also destroyed. This leads to uncontrolled invasion of fungi in the body called as secondary infection. Individual with cancer, diabetes etc are more prone to fungal infections.
Ex: Systemic candidiasis, Aspergillosis, Penicilliosis etc.
Even yeast infections are also prominent now a days.