MICROBES, IMMUNE SYSTEMS AND THEIR INTERACTION, TCD BYU22206-202526

Final Prep

Virus size range

0.05-1 micrometer

Bacteria and archaea size range

0.5-5 micrometers

Eukaryotic microorganisms

Yeasts, fungi, moulds, protozoa

Name the types of microorganisms

Viruses, bacteria, archaea, yeasts, fungi, moulds, protozoa

Yeast size range

5-10 micrometers

How many human cells make up the body?

How many cells of bacteria exist in the body?

Around 10^13 human cells

Around 10^13 to 10^14 bacterial cells

Toxins

Alter normal metabolism of host cells with deleterious effects on the host

Where does “toxin” get its name?

“Toxicum” is latin for poison

Toxigenicity

Ability of a pathogen to produce toxins

Intoxication

Disease resulting from specific toxin

Examples of bacteria that infect the intestinal cell by invasion

Salmonella spp.

Campylobacter spp.

Yersina enterocolitica

Escherichia coli (EIEC)

Examples of bacteria that infect intestinal cells by adhesion and production of toxins and effector proteins