Differences between Bacteria, Virus and Fungi

StructureMost bacteria consist of a ring of DNA surrounded by a cellular machinery, contained within a fatty membrane.They consist of little more than a small piece of genetic material surrounded by a thin protein coating. Some are also surrounded by a thin and fatty envelop.A typical fungus consists of the hyphae, which form the fungal body. These hyphae are microscopic walled tubes or filaments that are lined with plasma membrane and contain cytoplasm.
Cell membranePresent below the cell wallNo cell membranePresent
Genetic MaterialDNADNA or RNADNA
SizeMediumSmallest Largest
TypeIntercellular organismsIntracellular organismsEither unicellular or multi-cellular.
ShapeCome in three different possible shapesCocci = sphere shapeBacilli = rod shapeSpirella = spiral shapeViruses come in all different shapes.Most common shape is icosahedral, some are helical shaped. 

Some viruses are shaped like a space ship.  They are called bacteriophages.

Most fungi come in thread-like strands, called hyphae (collectively called mycelium)
HostCan grow on non-living surfacesNeeds a living host, like a plant or animalCan live on its own
UsefulnessSome are usefulMostly are harmfulMany fungi are beneficial
AntibioticsKill bacteriaCannot kill virusesDo not effect
Diseases CausedCholera, tuberculosis, lyme disease, pertussus, salmonella, staph infections, strep throat, leprosy, tetanus, diptheria, E.coli, flesh eating (necrotizing fascitis) rickets, etc.Flu, colds, HIV/AIDS, hepatitis, west nile, measles, herpes, shingles, chicken pox, monkey pox, polio, smallpox, ebola, and some cancers (epstein-barr) are just a few viruses that affect humans and animalsAllergic, ronchopulmona, aspergillosis, spergilloma, aspergillosis, athlete’s foot, dermatophyte, dermatophytid, dermatophytosis, etc.
Source of EnergySeize energy from the same essential sources as humans, including sugars, proteins, and fats.Seize materials and energy from host cells by hijacking cellular machineryThey use pre-existing carbon sources in their environment and use the energy from chemical reactions to create the organic compounds they need for energy and growth.
LivingYesCharacteristics of both living and non-livingYes
How they are transmittedDirect contact with an infected personContaminated food or water (Salmonella, E.coli)Dirty objects (tetanus)Infected animals (rabies)By direct contact with infected individualsBy contact with contaminated objects (such as toys, doorknobs)By inhalation of virus-laden aerosols. (think sneezes)By animals that act as hosts (vectors)Transmitted through a number of ways, which include transmission by air and contact.
ReproductionBacteria reproduce through binary fission, they split into two cells.Virus injects itself into a living cellProtein coat is discardedHereditary material takes over the cell’s activitiesVirus reproduces and the cell fills

Cell splits open

Viruses leave the cell and attack new cells

Reproduction takes place in multiple ways likeBuddingFragmentationProduction of spores asexually

Production of spores sexually

MotilityMove through the environment using a structure known as the flagellum.Viruses do not have structures and thus cannot move on their own.Typically, fungi are non-motile organisms.