Wk 9- Infectious Microbial Agents Flashcards Preview

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Flashcards in Wk 9- Infectious Microbial Agents Deck (14)
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1
Q

What are the 4 main microorganism?

  1. F-
  2. P-
  3. B-
  4. V-
A
  1. Fungi
  2. Protozoa
  3. Bacteria
  4. Viruses
2
Q

Microorganism classification:

Saprophages: live off dead and d? matter
Symbionts: live together with -
Commensals: live with and host and cause no harm
Parasites: live on/in another o? and cause p? conditions

A

decaying
host
organism, pathogenic

3
Q

Fungi:

E-
Uni cellular = ?
Multicellular = ?
Yeasts live in - environments 
? are visible mycelium 
Infection = myc?
A
Eukaryotes 
Yeasts
Moulds
Aqueous 
Moulds 
Mycoses
4
Q

Fungi mycoses:
Types of infections

  1. Su? : outermost surface layer skin
  2. C- : colonise in hair/skin/ nails
  3. Sub C-: entry via skin trauma
  4. Sy? : via spores, most dangerous
A
  1. Superficial
  2. Cutaneous
  3. Sub cutaneous
  4. Systemic
5
Q

Protozoa:

Unicellular E-
Very mobile 
Engulf small microorganisms
- environments 
Ingested in contaminated food and drink (g-) 
Carried by insects
A

Eukaryotes
Aqueous
Giardia

6
Q

Bacteria:

No nucleus= P-
No m- bound o-
External f- / pili for mobility
Bacteria in every habitat on earth

A

Prokaryotes
Membrane ,organelles
Flagella

7
Q

Pathogenic bacteria:

E coli
Fast replication =1 to 1 - in 8 hours
Inhabits i-
Cause gastro-

A

million
Intestines
Gastroenteritis

8
Q

Periodontitis: bacteria

Porphyromonas g?
Bacterial anti? and immune system
Immune cells release ROS( R? Oxygen sp?) super oxide and hydrogen peroxide to attack bacteria
ROS attacks host tissue and attracts more - cells

A

Gingivalis
Antigens
Reactive oxygen species
Immune

9
Q

Viruses:

Sub microscopic entities
They are ultra cellular p- , NOT cells
No n? o? or cytoplasm
Replicate - host

A

Parasites
Nucleus, organelles
Inside

10
Q

Virus / virion structure:

Viral DNA/RNA encapsulated pr? shell = capsid
Viral e? enable insertion into host DNA
Outer layer from host cell l? bilayer
Use hosts biochemical replication mechanism

A

protein
Enzymes
Lipid

11
Q

Viral Haemagglutinins and Neuraminidase:

Haemagglutinins:
Anti? glycoproteins on viral s?
Binds virus to host cells
1- different H identified

A

Antigenic , surface

18

12
Q

Viral H and N:

Neuraminidase:
E- on viral surface
Acts on infected cells surface to release viral progency
- different N’s

A

Enzymes
Release
9

13
Q

Effects of viral infection:

L? = cell rupturing , cell swell, functions diminish 
Syncytia= cells form together into large multi n? mass
A

Lysis

Nucleated

14
Q

Mutations to viral DNA/RNA:

Results in different viral s?
Difficult for treatment

A

Strains