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NURS 2228 - Microbiology > Unit 4 - Part 9 Protozoa > Flashcards

Unit 4 - Part 9 Protozoa Flashcards

1
Q

What are the two main stages in the life cycle of cysts or occyst-forming protozoa?

A
  1. Trophozoites

2. Cysts or oocysts

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2
Q

What is the active feeding stage of protozoa?

A

Trophozoites

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3
Q

How do trophozoites reproduce?

A

Asexually by binary fission

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4
Q

True or False:

Cysts are metabolically active

A

False

- cysts are metabolically inactive

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5
Q

True or False:

Oocysts are the products of sexual reproduction

A

True

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6
Q

What three things can cysts AND oocysts do?

A
  1. Remain infective/infectious outside the hosts
  2. Survive the environment for a long time
  3. May be involved in reproduction
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7
Q

Describe the stages involved where a trophozoite forms into a cyst

A
  1. Trophozoite (active, feeding)
  2. Drying, lack of nutrients - cell rounds up, loses motility
  3. Early cyst wall formation
  4. Mature cyst (dormant, resting stage)
  5. Moisture, nutrients restored
  6. Cyst wall breaks open
  7. Trophozoite is reactivated
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8
Q

True or False:

Both simple and complex reproductive strategies are observed among protozoa

A

True

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9
Q

True or False:

Some protozoa only asexually reproduce while others only sexually reproduce

A

False

  • some reproduce only asexually
  • others reproduce BOTH sexually and asexually!
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10
Q

What are the two methods that protozoa can reproduce asexually?

A
  1. Binary fission

2. Multiple fission

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11
Q

What happens in binary fission?

A

A parent cell gives rise to TWO daughter cells

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12
Q

What happens in multiple fission (also called schizogony)?

A

A parent cell gives rise to multiple daughter cells

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13
Q

What are the 3 names for a parent cell?

A
  • Schizont
  • Meront
  • Segmenter
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14
Q

What are the 4 different ways that a protozoa can undergo fission (what are the 4 types of fission)?

A
  1. Spherical fission
  2. Longitudinal fission
  3. Transverse fission
  4. Oblique fission
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15
Q

What occurs in sexual reproduction of protozoa?

A

Fusion of gametes or gametocytes to produce zygotes

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16
Q

What are the 5 stages of reproduction for malaria?

A
  1. Asexual phase (human is infected)
  2. Exoerythrocytic phase (in liver cells)
  3. Erythrocytic phase (in RBC)
  4. Gametocyte phase (in RBC)
  5. Sexual phase (in mosquito)
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17
Q

What is an example of a protozoan disease that involves mosquitos?

A

Malaria

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18
Q

What is the mode of transmission of malaria?

A

Female mosquitoes (Anopheles)

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19
Q

What are the s/s of malaria?

A

Fever, chills, sweats, cough, diarrhea, respiratory distress, headache, shock, renal and liver failure, pulmonary and cerebral edema, come and death

20
Q

What are the three leading causes of infection-related deaths seen worldwide?

A
  1. AIDs
  2. Tuberculosis
  3. Malaria
21
Q

Approximately how many deaths are associated with malaria each year?

A

Half a million

22
Q

What are some control strategies for preventing the spread of malaria?

A
  • prevent mosquito bites (netting or repellents)
  • prevent entry (close doors/windows, have screens)
  • prevent mosquito breeding (avoid water logging; kill larvae)
23
Q

What is used to kill the asexual forms of malaria? the sexual forms?

A

Asexual = Chloroquine
Sexual = Primaquine
- these two things are used in the treatment of malaria

24
Q

What is the protozoan disease that is acquired through the ingestion of water contaminated with fecal matter containing cysts?

A

Giardiasis (Beaver fever)

25
What are the s/s of Giardiasis?
Chronic diarrhea, abdominal cramps, bloating, frequent loose and pale greasy stools, fatigue, weight loss
26
What is the treatment for Giardiasis?
Usually self-limited | - rehydration therapy and antibiotics (metronidazole)
27
What happens during the intestinal phase of Giardiasis?
Excystation occurs in the small intestine - two trophozoites are released from each cyst - multiply by longitudinal fission
28
Which protozoan disease has thick and thin walled oocysts?
Cryptosporidiosis
29
What is the main reservoir for Cryptosporidiosis?
- Humans - Cattle - Other domestic animals
30
How does self-infection occur with crytposporidiosis?
Commonly by thin-walled oocysts
31
True or False: | Thick-walled oocysts of cryptosporidiosis can survive in the environment
True
32
What are the s/s of Cryptosporidiosis?
Profuse and water diarrhea + abdominal cramps | - sometimes malaise, fever, anorexia, and vomiting
33
True or False: | 10-20% of AIDs patients suffer cyrptosporidiosis at some time during their illnessq
True
34
What is the treatment for cryptosporidiosis?
Usually self-limited | - rehydration therapy, and antibiotics (azithromycin)
35
True or False: Thick walled oocysts of cryptosporidium allow for survival in the host. Thin walled oocysts of cryptosporidium allow for survival in the environment
False - Thick walled = environment - Thin walled = host (auto-infection)
36
What protozoan disease can be caused by cats?
Toxoplasmosis
37
What is the mode of transmission for toxoplasmosis?
Ingestion of oocysts from the fecal droppings of cats | fecal-to-hand-to-mouth
38
What is another mode of transmission for toxoplasmosis?
Ingestion of contaminated water or undercooked/raw meat
39
What can happen if a pregnant women gets infected with toxoplasmosis?
Can cause miscarriage and/or serious physical and developmental damage to the fetus/newborn
40
What are the s/s of toxoplasmosis?
Fever, lymphadenopathy, cerebritis, pneumonia, myocarditis, and/or death in the immunocompromised
41
True or False: | The damage caused by congential toxoplasmosis is reversible
False | - causes birth defects (and death) due to irreversible damage to liver, brain, and spleen
42
What protozoan disease does not produce any cyst or oocyst?
Trichomoniasis
43
What is a protozoan disease that is a common sexually transmitted disease?
Trichomoniasis
44
True or False: | Trichomoniasis can coexist with gonorrhea
True | - up to 40% in some cases
45
What are the s/s of trichomoniasis in women?
- small, pinpoint, non-raised, round, red strawberry-like rash - thin, foamy greenish-yellow discharge w/foul odor - cervical inflammation
46
What is the treatment for trichomoniasis?
Metronidazole

NURS 2228 - Microbiology (9 decks)

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