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Pathogenic Organisms
What does pathogen mean?
Etymology
Let’s break down the word into its roots
patho – greek word pathos meaning
suffering or disease
 gen – greek word genes meaning to be
born or produced

Pathogen a Definition
A disease causing microorganism
What are some types of pathogen?
Think, pair, share -
Bacteria
Single celled organisms that lack a nucleus
 Because they have no nucleus we call
them prokaryotes
 Classified as kingdoms Eubacteria and
Archaebacteria
 Can cause many diseases including
salmonella, pneumonia, tetanus, and plague

Anthrax Bacteria
Bacillus anthracis
Source: http://www.bact.wisc.edu/Bact330/lectureanthrax
Source: CDC
with white blood cells
Streptococcus pyogenes
“flesh eating bacteria”
http://img.medscape.com/pi/emed/ckb/infectious_diseases/211212-1641790-225243-1608843.jpg
Fungi
Multicellular with a nucleus, heterotrophs
(consume other organisms for food) with
cell walls containing chitin
 This kingdom includes mushrooms, molds,
mildew, and yeas
 Diseases such as athletes foot, pneumonia,
or meningitis

Aspergillus fumigatus
Source: Chiba Univ., Japan
Protozoans
Single celled organisms with a nucleus –
may be photosynthetic or heterotrophic
 Classified as the kingdom Protista
 Can cause diseases such as giardiasis and
cryptosporidium

Giardia lamblia
http://www.tulane.edu/~wiser/protozoology/notes/intes.html
Virus
Very small particle of genetic material and
proteins reproduces inside the cells of a
host organism
 100 times smaller than bacteria
 Cause diseases such as ebola, flu, mumps,
measles, and rabies

Viruses
Papillomavirus
Influenza
Hepatitis B
http://web.uct.ac.za/depts/mmi/stannard/emimages.html