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Microbiology > Protozoa > Flashcards

Protozoa Flashcards

1
Q

What are the forms of Entamoeba histolitica? Which is the infective form?

A

Cyst- Infective form

Trophozoite- motile, feeding form

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2
Q

What is the most common site of abscess formation if E. histolytica trophozoites penetrate portal blood circulation?

A

Liver- Cause RUQ pain

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3
Q

What would be present in the stool sample of a person with active disease from Entamoeba histolytica?

A

Trophozoites with RBC’s in the cytoplasm

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4
Q

What type of symptoms are characteristic of a Giardia infection?

A

Abdominal gas, distention

Greasy, frothy diarrhea with bad odor

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5
Q

Where does the life cycle of Cryptosporidium take place?

A

Intestinal epithelial cells

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6
Q

What protozoa is sexually transmitted and only has a trophozoite stage?

A

Trichomonas vaginalis

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7
Q

What organism passes through the cribriform plate and causes acute meningoencephalitis? Classic patient history?

A

Naegleria fowleri

Hx of swimming in fresh water

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8
Q

What is the most common CNS infection in AIDS patients?

A

Toxoplasma encephalitis

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9
Q

How might an AIDS patient with Toxoplasma encephalitis present?

A

With seizures, gait instability, HA, focal neurologic signs, often involving a growing mass (seen on CAT scan)

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10
Q

What is the most common opportunistic infection in AIDS patients?

A

Pneumocystis carinii pneumonia

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11
Q

What protozoa is transmitted via the Reduviid bug (Kissing bug)?

A

Trypanosoma cruzi- Chagas disease

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12
Q

What is the cause of River blindness? What is the vector?

A

Onchocera volvulus

Blackfly bite

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13
Q

What protozoa stains acid-fast and causes severe diarrhea in AIDS patients?

A

Cryptosporidium parvum

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14
Q

What does congenital Toxoplasmosis lead to in a fetus?

A

Chorioretinitis, hydrocephalus, and intracrainial calcifications, microcephaly

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15
Q

What causes African Sleeping Sickness? What is the vector?

A

Trypanosoma brucei

Transmitted via Tsetse fly

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16
Q

What types of malaria produce dormant hypnozoites in the liver?

A

Plasmodium vivax and ovale

17
Q

What is the difference between tertian and quartan malaria?

A

Tertian- RBC lysis every 48 hours (P. vivax/ovale)

Quartan- RBC lysis every 72 hours (P. malariae)

18
Q

What is the vector for Leishmaniasis?

A

The Sandfly

19
Q

What are the classic presentations for chronic Chagas disease?

A

Cardiomyopathy, megacolon, and esophageal dilation, LES hypertrophy, difficulty swallowing

20
Q

How would a wet mount of Trichomonas vaginalis and Gardnerella vaginosis differ?

A

Trichamonas- motile, pear-shaped flagellates

Gardnerella- clue cells

Microbiology (7 decks)

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