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is the living together and in-
teraction between two different species
symbiosis
in such a way that at least one species
benefits
the larger organism in a symbiotic rela-
tion is known as the , an example host, human
of this would be a
the smaller organism in a symbiotic rela-
tion is known as the , an exam- symbiont, microbe
ple of this would be a
the symbiont benefits from the
ALWAYS
interaction
symbiosis can be classified into: commensalism, mutualism, parasitism
is when the host nei-
commensalism
ther benefits nor gets harmed
is when the host benefits mutualism
is when the host is harmed parasitism
a is an organism that lives on
or in another organism (the host), bene- parasite
fiting from it while causing it some harm
smaller parasites are referred to as
(bacteria, virus) and
microparasites, macroparasites
larger parasites are referred to as
(protozoa)
(or microbiota)
refers to microorganisms normally col-
normal flora
onizing skin and mucus membrane of
humans and animals
the predominant species are
, BUT , bacteria, fungi, viruses, protozoa
, and can be found
a human can have about bac-
10^14, 10^13
teria, compared to of own cells
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, MICRO 3050 - HOST MICROBE RELATIONSHIP & INFECTION Actual Final Exam
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the composition of normal flora differs
from to another due to differ-
site/habitat, pH, anaerobiosis, nutrients,
ences in key ecological factors (for ex-
adhesion ligands
ample, , , ,
, etc.)
normal flora can be divided into
resident, transient
and
are members
of normal flora that are regularly found at resident flora
a particular habitat
are members
of normal flora that are only occasionally
transient flora
found at a particular site and for short
periods
major members of the 's flora in-
clude:
staphylococci
micrococcus
corynebacteria
skin, positive
propionibacteria
malassezia
all are gram (except
malassezia)
malassezia is part of the 's
skin, fungus
flora, and is a type of
major members of the 's flora in-
clude:
streptococci
rothia
actinomyces
oral cavity, positive, negative
neisseria
haemopilus
fusobacterium
candida
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