Bacteriology

BACTERIOLOGY
The science that deals with the study of microorganisms called bacteria.
BACTERIA
Minute, one-celled vegetable microorganisms found nearly
everywhere.
Nonpathogenic
These are helpful or harmless bacteria that perform useful
functions such as decomposing refuse and improving soil
fertility.
Saprophytes
Nonpathogenic bacteria that live on dead matter and do not
produce disease.
Pathogenic
Harmful and disease producing when they invade plant or
animal tissue.
Parasites
Require living matter for their growth.
Cocci
Round shaped and appear singly or in groups.
Staphylococci
Pus-forming and grow in bunches or clusters. They cause
abscesses, pustules, and boils.
Streptococci
Pus-forming and grow in chains. They cause infections such as strep throat.
Diplococci
Grow in pairs and cause pneumonia.
Bacilli
Short, rod-shaped. They are the most common bacteria and
produce diseases such as tetanus, influenza, typhoid fever,
tuberculosis, and diphtheria.
Flagella or Cilia
Hairlike projections used to move about. A whip-like motion of these hairs propels bacteria about in liquid in much the same way as human beings use their arms and legs to swim.
Spirilla
Curved or corkscrew shaped. Subdivided into several groups. Treponema pallidah causes syphilis.
Mitosis
They then divide into two new cells called called daughter cells.
Local infection
One that is confined to a single area such as a pimple, boil, or infected cut.
General infection
When pathogenic bacteria and their toxins are carried to all parts of the body by way of the bloodstream, general infection such as blood poisoning or syphilis results.
Contagious or communicable
Diseases spread from one person to another by direct or indirect contact such as coughing, sneezing, unclean hands, unclean implements, open sores, common drinking cups, common towels, etc.
Filterable viruses
Living organisms so small they can pass through the pores of porcelain filter. Cannot be seen through a microscope.
Plant parasites or fungi
Produce contagious diseases such as ringworm or favus, which is a disease of the scalp. Can cause lifting of the fingernails or toenails.
IMMUNITY
The ability to fight off or resist infections and disease and to
destroy bacteria that have entered the body.