Micro simple review Flashcards
Nematode (roundworm)
Long cylindrical body
Tapers both ends
Both sexes
Multi layered cuticle
Entero Vernicularis
Pinworm
E. Vernicularis (pinworm)
most common worm dz in US
E. Vernicularis (pinworm)
Small, white
Life cycle direct and short, short time to become infectious
E. Vernicularis (pinworm)
Children most common
Butthole, night, gravid female
Ascaris Lumbricoides
Roundworm
Ascaris Lumbricoides (roundworm)
Largest intestinal nematode of humans
Ascaris Lumbricoides (roundworm)
Mother releases 200K (TONS) of eggs per day
Ascaris Lumbricoides
roundworm
ingestion of contaminated soil
Ascaris Lumbricoides (roundworm)
Lung, trachea, (swallow), duodenum
Ascaris Lumbricoides (roundworm)
“Loeffler’s synd” pulmonary
Ascaris Lumbricoides (roundworm)
Worm burden
blockage
Trichuris Trich (whipworm)
Small egg capsules
PAINFUL POOP
Rectal prolapse
Ingestion of contaminated soil
A. Lumbricoides (roundworm), and Trichuris Trichura (whipworm)
Complication of Trichuris Trich (whipworm)
Children: Growth retardation and Anemia
Hookworm
Feed on blood and mucosa
Sx: blood filled itchy lesions “ground itch”
“ground itch”
Hookworm
Worms that can PENETRATE SKIN
Hookworm and Threadworm (strongy)
Worms that travel lungs, trachea (swallow) –> duodenum
Roundworm (A.lumbric)
Hookworm
Threadworm (strongy)
Hookworm
Nectator americanus
Ancylostoma duodenale
Blood filled itchy lesions
“Ground itch”
Anemia
Hookworm
Necator americanus, Ancylostomat duod
Strongy sterc (Threadworm)
Tropical
Can penetrate skin
Lungs-trachea-duod
Clinical sx depend on Larval migration
Strongy sterc (threadworm)
Dx: Duodenal aspirate and Sputum of rly infected person
Complication with Strongy sterc (threadworm)
Larval migration
Auto-infection, re-infection allows #s to build up
Chronic- life threatening in HIV
Trematude (fluke)
Flattened, leaf like
Treee-matude (“tree” and “leaf”
Trematude (fluke)
Flattened, leaf like
Suckers
Hemaphrodite
Tapeworm 2 subtypes
Taenia solium (pork) Taenia saginata (beef)
If you are SAGGY, you have eaten too much BEEF
Taenia Solium and
Taenia Saginata
(tapeworms)
Scolex
Eggs released in proglottids- immediately infectious!
Taenia Solium and
Taenia Saginata
Humans only host
Taenia Solium and
Taenia Saginata lifecycle
Cysticerci (larvae) develop in muscle
Taenia Solium and Saginata
Uncooked meat ingested
Cysticercosis
A complication of Taenia Solium and Saginata
Can develop if infective eggs are ingested
Taenia Solium and Saginata
Usually ax and invove only 1 worm
BUT, Cysticersosis can develop if serious–> Blindness, Seizure
Diphyll latum
Fish tapeworm
Eggs released SINGLY
Diphyll latum (fish tapeworm)
require many hosts
ALASKA and Great lakes
Diphyll latum (fish tapeworm)
Mostly A-sx
B12
Anemia if sx
Viral gastroenteritis
Acute, watery diarrhea
Viral gastro replicates in
Small intestine epith cells
Norovirus
90% of Viral GI
Daycare, hospital, cruise
Top cause of GI in US
Food prep
Norovirus persists in environment bc
Naked virus is persistent