Download Into to Diseases

An introduction to a world of
microbes
 The
cause of disease
• Bacteria
• Fungus
• Protist
• Virus
Attacks a body that is weak or has damaged tissue
 Diseases
classified into
categories:
major
• Infectious
• noninfectious
 Disease
caused by bacteria, viruses,
Protist and fungi are infectious
 Disease caused by non-living agents are
noninfectious
 Acute
– severe rapid onset with short
duration
 Chronic – long duration may wear down
the animals resistance
 Pathogen – harmful group of
microorganisms that cause disease
 Vector(live) – an insect or animal that
transmits, carries or spreads disease
 Vector(inanimate)
– contaminated feed,
water, needles, syringes, dehorning
equipment, fence post, troughs, buckets,
dishes, stalls, bedding, feces, urine and
saliva
 Phagocyte
– animal cell capable of
ingesting microorganisms or other
foreign bodies
 Carrier – when a host animal and the
invading organism are able to live
together without serious injury to each
other. The host spreads the infection to
others.
 Cuts, punctures
or abrasions
 Mucous membranes of the respiratory
tract, eyes, mouth and nose
 Gastrointestinal tract
 Urogenital tract
 Those
diseases spread from one animal
to another are referred to as contagious
or communicable
 Primary
– skin, gastric juices, coughing,
tear gland, sneezing, waste removal
systems
 Secondary – antibodies, phagocytes
BACTERIA
 Single cells or Phototrophs Nitrogenfixers, saprobes
 colonies of cells chemotrophs as
parasites of plants and
 no cell nucleus heterotrophs animals, gut
sybionts
FUNGI

Single cells, filaments All are
heterotrophs Yeasts, molds of cells or
many- mildews, celled organisms
mushrooms, with a cell nucleus
toadstools, puffballs
PROTISTS
 Single cells, colonies Photrophs,(algae)
Algae, including of cells and true and
heterotrophs seaweeds; protozoan's
multicellular including amoebas,
organisms paramecium
VIRUS
Not cellular Parasites
Cold and influenza
viruses, herpes
viruses intestinal
viruses cancer
viruses
 Prevention
• Eliminate the source of
•
•
•
•
the pathogen
Sanitation
Eliminate a
vector/carrier
Sexual contact
Vaccinate
 Treatment
• Antibiotics
 Kill a bacteria
 Inhibit growth
 Produces a toxin
Fungicides
 kills fungus
Algicide
 kills algae
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