8/9/2019 Microbiology Infection

1/13

CHAPTER 3

8/9/2019 Microbiology Infection

2/13

Chain of infection

8/9/2019 Microbiology Infection

3/13

Factors Inuencing Occupancy ofInfection

1. portal of entry organiss ay fail to pro!uce a !isease "hen

intro!uce! into the #o!y #y soe other route orpath"ay

typhoi! #acilli $ to #e s"allo"e! to cause infection

% pro!uces inaation only "henru##e! on the s&in

E'. streptococci

(. )irulence of the organiss

a#ility of the icro#es to pro!uce the !isease #yo)ercoing the !efensi)e po"ers of the host icro#es are ost )iolent "hen freshly !ischarge!

fro an ailing person

3. nu#er of icro#es

crucial to infection*. !efensi)e o"ers of the host

8/9/2019 Microbiology Infection

4/13

Patterns of Infection

I+C,-ATIO+ PERIO $ infection is recei)e!to the appearance of !isease

% a/ecte! #y the follo"ing factors0

a. nature of the agent#. )irulence of host

c. resistance of host

!. Resistance fro the site of entrance tothe focus of action

e. nu#er of infectious agents in)a!ingthe #o!y

8/9/2019 Microbiology Infection

5/13

8/9/2019 Microbiology Infection

6/13

*. FA4TI6I, or ACE $!isease at its heightor pea&.

7. EFERE4CE+CE OREC2I+E $ phase"here anifestationsof !isease su#si!e

% profuse s"eating% heat loss in e5cee!ing

heat pro!uction

8. 4E2F%2IITI+6I+FECTIO+4

8/9/2019 Microbiology Infection

7/13

Types of Infection 9

2OCA2I:E $ icro#esreain con;ne! to aparticular part of the #o!y

% e5aple0 #oils< a#scesses 6E+ERA2I:E $

icroorganiss an! theirpro!ucts are sprea!generally o)er the #o!y #ythe #loo! or lyphatic=s

I'E $ cause! #y ( or oreorganiss >priary infection? secon!ary infection@

FOCA2 $ con;ne! to arestricte! area fro "hichinfectious aterial sprea!sto other parts of the #o!y>infections of teeth< sinuses