Pathogenic OrganismsPathogenic Organisms

What does pathogen What does pathogen mean?mean?

EtymologyEtymology

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 DefinitionPathogen a Definition

A disease causing microorganism

What are some types of What are some types of pathogen?pathogen?Think, pair, share -

BacteriaBacteriaSingle celled organisms that lack

a nucleusBecause they have no nucleus

we call them prokaryotesClassified as kingdoms

Eubacteria and ArchaebacteriaCan cause many diseases

including salmonella, pneumonia, tetanus, and plague

Anthrax BacteriaAnthrax BacteriaBacillus anthracisBacillus anthracisSource: http://www.bact.wisc.edu/Bact330/lectureanthrax

Source: CDC

with white blood cells

Streptococcus pyogenesStreptococcus pyogenes

“flesh eating bacteria” http://img.medscape.com/pi/emed/ckb/infectious_diseases/211212-1641790-225243-

1608843.jpg

FungiFungiMulticellular 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 fumigatusAspergillus fumigatusSource: Chiba Univ., Japan

ProtozoansProtozoansSingle celled organisms with a

nucleus – may be photosynthetic or heterotrophic

Classified as the kingdom Protista

Can cause diseases such as giardiasis and cryptosporidium

Giardia lambliaGiardia lamblia

http://www.tulane.edu/~wiser/protozoology/notes/intes.html

VirusVirusVery small particle of genetic

material and proteins reproduces inside the cells of a host organism

100 times smaller than bacteriaCause diseases such as ebola,

flu, mumps, measles, and rabies

VirusesVirusesPapillomavirus

Influenza

Hepatitis B

http://web.uct.ac.za/depts/mmi/stannard/emimages.html