Features of Bacteria, Viruses and Fungi
Infectious diseases are diseases or illnesses (caused by bacteria or
viruses) that can be transmitted from person to person or from
organism to organism by touch or the exchange of blood or saliva and
also could be passed through air molecules. For instance, the common
cold and AID's are infectious diseases, whereas illnesses such as
diabetes and gout are non-infectious diseases.
Because many cold viruses are spread by contact with infected
secretions, frequently washing the hands, carefully disposing of used
tissues, and cleaning items and surfaces can help to reduce their
- They are very small living cells.
- They are about 1/100th the size of body cells.
- They make you ill by damaging your cells and producing toxins.
- Some can be useful if they are in the right part of the body.
-Fungi can cause a number of plant and animal diseases: in humans,
ringworm, athlete's foot, and several more serious diseases are caused
- Because fungi are more chemically and genetically similar to animals
than other organisms, this makes fungal diseases very difficult to
- Some fungi provide numerous drugs (such as penicillin and other
- Viruses are not cells, they are much smaller.
- They are about 1/100th of the size of bacteria.
- They make you feel ill by damaging your cells.
- They replicate themselves by invading the nucleus of a cell and
using the DNA it contains to produce many copies of itself.
- The cell then burst, releasing all the new viruses.
- They can reproduce very quickly, this way.
A cold virus is deposited into the front of the nasal passages by
contaminated fingers or by droplets from coughs and sneezes. Small
doses of virus are sufficient to produce infection.
The virus is then transported to the back of the nose and onto the
adenoid area by the nose itself!
Sneezing, runny nose, nasal obstruction, sore or scratchy throat,
cough, hoarseness, and mild general symptoms like headache,
feverishness, chilliness, and not feeling well in general
A common cold is a two step process. The first step is virus infection
of nasal cells. The second step is the activation of the inflammatory
mediators, which directly cause the cold symptoms. Ideally, it is
desirable to treat both parts of the process but currently drugs for
treating the virus infection (antivirals) are not commercially
Dry and itchy lesions. Patients often report a burning or stinging
sensation. A common associated condition with athletes foot is a
fungal nail infection if athletes foot is not treated the...