Microbial Diseases of the Skin and Eyes
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Transcript of Microbial Diseases of the Skin and Eyes
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
PowerPoint® Lecture Slide Presentation prepared by Christine L. Case
M I C R O B I O L O G Ya n i n t r o d u c t i o n
ninth edition TORTORA FUNKE CASE
Part B21Microbial
Diseases of the Skin and Eyes
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
Warts
Papillomaviruses
Treatment
Removal – by freezing, burning, or drying
Imiquimod (stimulates interferon production)
Interferon
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
Poxviruses
Smallpox (variola)
Smallpox virus (orthopox
virus)
First artificially
immunization
Monkeypox
Prevention by smallpox
vaccination
Figure 21.9
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
Herpesviruses
Chickenpox
Varicella-zoster virus
(human herpes virus 3)
Transmitted by the
respiratory route
Virus may remain latent
in dorsal root ganglia
Figure 21.10a
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
Shingles
Reactivation of latent
HHV-3 releases viruses
that move along
peripheral nerves to skin.
Figure 21.10b
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
Herpes Simplex 1 and Herpes Simplex 2
Human herpes virus 1 and HHV-2
Cold sores or fever blisters (vesicles on lips) HHV-1
Herpes gladiatorum
Herpes whitlow
Herpes encephalitis (HHV-2 has up to a 70%
fatality rate)
HHV-1 can remain latent in trigeminal nerve ganglia.
HHV-2 can remain latent in sacral nerve ganglia.
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings Figure 21.11
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings Figure 21.12
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
Measles (Rubeola)
Measles virus
respiratory route
Macular rash
Prevented by vaccination.
MMR
(Measles, Mumps, Rubella)
Figure 21.14
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
Measles (Rubeola)
Figure 21.13
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
Rubella (German Measles)
Rubella virus
Macular rash and fever
Congenital rubella
syndrome causes severe
fetal damage.
Prevented by vaccination
Figure 21.15
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
Cutaneous Mycoses
Dermatomycoses: Tineas or ringworm
Metabolize keratin
Treatment
Oral griseofulvin
Topical miconazole and clotrimazole
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
Candidiasis
Candida albicans (yeast)
Candidiasis may result from suppression of competing
bacteria by antibiotics.
Occurs
Skin, mucous membranes, and mouth
Thrush
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
Candidiasis
Figure 21.17
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
Scabies
Sarcoptes scabiei burrows in the skin to lay eggs
Treatment with topical insecticides
Figure 21.18
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
Pediculosis
Pediculus humanus
capitis (head louse)
P. h. corporis (body louse)
Feed on blood.
Lay eggs (nits) on hair.
Treatment with topical
insecticides.
Figure 21.19
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
Bacterial Diseases of the Eye
Conjunctivitis (pinkeye)
Haemophilus influenzae
Various microbes
Associated with unsanitary contact lenses
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
Bacterial Diseases of the Eye
Chlamydia trachomatis
Trachoma
Leading cause of blindness worldwide
Infection causes permanent scarring; scars
abrade the cornea leading to blindness