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Categories of bacteria found in normal microbial flora

Resident flora


Transient flora

2

Resident Flora

Microbes that are always present in a particular area of the body

Transient flora

Microbes that stay in/on the body for a short amount of time and then move on or die off

What type of relationship does the normal microbial flora have with the human body?

Symbiotic relationship

Symbiotic relationship

A close interaction between two different organisms

Types of symbiosis

Mutualism


Commensalism


Parasitic

Mutualism

Helpful


i.e E. coli

Commensalism

Harmless


i.e. Staphylococcus epidermidis

Parasitism

Harmful


i.e H1N1 and Taenia

Explain the nature of the mutualistic relationship between humans and e.coli

- E.coli is part of the normal flora of the large intestine


- It synthesizes vitamin K and B vitamins which are absorbed by our normal metabolism


- In exchange, we provide a warm, moist environment with a steady flow of nutrients

Opportunistic infection

When conditions allow members of normal flora that are typically not pathogenic to take over and cause disease

What is an example of an opportunistic infection?

Staphylococcus aureus (which is normally found on the skin) sometimes gets into a wound or burn and becomes pathogenic

What was the predominant gram reaction and morphology of the normal flora of the class?

Gram + cocci