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Malaria > Midterm > Flashcards

Midterm Flashcards

1
Q

Galen’s four humor theory of disease

A 
Blood
Black bile
Yellow bile
Phlegm 
how all diseases come from inside you so it created a huge step backwards as it shifted an outward causality for diseases to an inward = less hygiene etc.
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2
Q

John Snow

A

London Cholera mapping

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3
Q

Crudelli & Klebs

A

identify bacillus rods

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4
Q

Alphonse Laveran

A

stepped away from slide and sees exflagellation stage, cooled blood

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5
Q

George sternburg

A

can’t duplicate Crudelli & Krebs, same results in rabbits with spit

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6
Q

patrick manson

A

identifies mosquito vector for worm but only thought they took one blood meal and that dead mosquitos must release microbes in water

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7
Q

ronald ross

A

can’t prove mosquito water, doesn’t like ecologists; later discovers Anopheles mosquitos and prove mosquitos have malaria

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8
Q

Bignai & grassi

A

ask malaria victims about what they do to prevent, convinced of mosquito vector; get first credit

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9
Q

robert koch

A

creates koch’s postulates and describes acquired immunity in malaria

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10
Q

domenico falleroni

A

collects mosquito eggs and notices 2 different types = 2 different mosquitos

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11
Q

Anopholism without malaria arguments

A

Malaria cases where there are not Anopheles mosquitos

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12
Q

Rome History

A

surrounded by pontine marshes and campagna = regular exposure and partial immunity; northern invaders die = malarial moat; houses faced inward. Atroparvus mosquito species keeps invading species out but it’s a good vivax vector and bad falciparum vector. Cut oak forest down, mosquitos from Africa colonize and are good falciparum vectors; adapts to cold winters by moving indoors. Stable transmission is interrupted = loss of immunity = INC falciparum

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13
Q

Scotland History

A

sailed to Panama; slaughtered by malaria; bankrupted; England paid their debts and not independent anymore

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14
Q

Americas

A

import slaves with falciparum = INC mortality for whites = INC need for more slaves; Europeans bring malaria to vulnerable Native Americans; Punctipennis mosquito is dominant in New England and prefers animals, bad falciparum vector. People start using mill dams for power = start building dams to make mill ponds to power water wheels. Quadramaculatus mosquito is favored in this condition; war brings soldier with vivax home and lives close to mill dams = malaria spread; association of mill dam ponds with malaria; finally take dams down

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15
Q

Africa

A

malaria repels European invaders

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16
Q

Spanish

A

import slaves with falciparum causing spread to Panama

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17
Q

Bantu events

A
  • Before Bantu: cold temps, wandering hunter/gatherers = irregular exposure and low population density; also forest floors have less mosquito habitat
    • Sahara desert formed and Bantu moved south to equatorial Africa
    • Bantu cut down jungle for farming = no other malaria prey = mosquitos colonize free puddles = anopheles gambiae rise
    • Wandering nomads visit a village; not immune = death by malaria
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18
Q

Anopheles gambiae

A

Feeds almost exclusively on humans, most reliable malaria vector

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19
Q

Which malaria has the longest incubation period?

A

P. malariae

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20
Q

Which malaria uses duffy antigens to adhere to RBCs

A

P. vivax

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21
Q

Which malaria infects 80x more than vivax?

A

P. falciparum

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22
Q

Which malaria is in monkeys

A

P. knowlesi

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23
Q

One sentence definition for Malaria:

A

Infection by protozoan parasites (plasmodium) that is transmitted by mosquitos causing fever, anemia and death.

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24
Q

What are the two hosts malaria uses?

A

Humans and female anopheles mosquitoes

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25
Q

Definitive v Secondary host

A

Definitive host: host in which parasite reaches maturity and reproduces sexually (mosquitos)
Secondary/intermediate host: host in which the parasite only resides for a short period of time in an immature form (humans)

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26
Q

Describe the sporogenic cycle

A

Sporogenic cycle: in mosquitos; gametocytes activate in colder temp of mosquito and create ookinete; ookinetes multiply asexually and form oocytes that make 1000s of sporozoites

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27
Q

Describe the exo-erythrocytic cycle

A 
Exo-erythrocytic cycle: in humans, outside RBC; sporozoites injected into humans and travel to liver via bloodstream; migrate through several liver cells before settling the parasitophorous vacuole; each vacuole generates many merozoites that are transported to bloodstream via merosomes
		○ Falciparum 5-6 days
		○ Vivax 8 days
		○ Ovale 9 days
		○ Knowlesi 8-9 days
Malariae 13 days
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28
Q

Describe the Erythrocytic cycle

A

Erythrocytic cycle: in humans inside RBC: merozoites recognize RBCs, attach to RBC surface proteins and use membrane to create parasitophorous vacuole. The Merozoites feed on hemoglobin and alter RBC membrane to be more permeable; each merozoite makes 8-12 new ones that infect more RBCs
○ Occurs every 24 hours in knowlesi
○ Every 48 hours in falciparum, vivax and ovale
Every 72 hours in malariae

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29
Q

What else happens to merozoites?

A

Some merozoites develop gametocytes that lie dormant in bloodstream

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30
Q

which malarial stage is responsible for recurring malaria?

A

Hypnozoites

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31
Q

Which malarial stage would you block with a vaccine to prevent infection?

A

Sporozoites

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32
Q

Sustained fever

A

temperature does not fluctuate more than 1 degree/24 hours; graph shows 2/3 at constant temp then decrease

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33
Q

Remittent fever

A

fluctuation of 2 degrees per hour; graph shows consistent and almost equal spikes and dips

34
Q

Intermittent fever

A

normal temp except for a few hours per day; graph has random spikes and dips

35
Q

Relapsing

A

high temp more than 3x in 6 months, at least a week apart, lasting a few hours to a few weeks. Fevers separated by symptom-free intervals; graph shows long period of high fever, long period of low fever, repeat

36
Q

Fever

A

elevated body temp regulated by hypothalamus. Damage can occur directly to cells, locally as inflammation or systemic as gut bacterial translocation

37
Q

Falciparum fever

A

tertian

38
Q

Vivax/Ovale fever

A

tertian

39
Q

Malariae fever

A

quartan

40
Q

Knowlesi fever

A

quotidian

41
Q

What are pyrogens and examples of exogenous and endogenous?

A

Pyrogens: heat producing substances

Exogenous like staph aureus toxin. Endogenous like cytokines

42
Q

How does your body generate heat or reduce heat loss?

A

Shiver to produce heat
Shunting of peripheral blood to core to reduce heat loss
Vasoconstriction to reduce heat loss

43
Q

How do we know malaria exerted evolutionary pressures?

A

We made adaptations to survive it

44
Q

Which malaria is most ancenstral?

A

P. malariae

45
Q

Which malaria is most modern?

A

P. falciparum

46
Q

List blood adaptations and if they affect RBC function

A

Ovalocytosis: oval shaped RBC
Hemoglobin E: deforms Hb and slows vivax in body
RBC without duffy antigens: does not affect RBC function
Thalassaemia: deforms Hb and slows vivax
Sickle cell: reduces cell invasion = high survival rate from falciparum

47
Q

How long does it take for you to lose acquired immunity

A

> 6 months = lost resistance

48
Q

Innate v Acquired immunity

A

Innate: sickle cell trait against falciparum
Acquired: continuous exposure

49
Q

Incubation periods

A 
Faciparum: 9-14 days
Vivax: 12-18 days - uses duffy antigens
Ovale: 12-18 days
Malariae: 18-40 days - oldest model, longest incubation
Knowlesi: 11-12 days
50
Q

What is premunition?

A

Host response that protects you against high numbers of parasite and illness that does not eliminate infection and is only partially effective

51
Q

Relapse v Recrudescense

A
  • Relapse: recurrence of infection from activation of hypnozoites - only from vivax and ovale; blood was cleared of malaria
    • Recrudescence: infection recurring from persistent blood stages of malaria; symptomatically better but still have parasite in blood - all malaria; usually happens if treatment is incomplete
    • in falciparum and malariae, parasites are not completely eliminated after recovery
52
Q

Thick v Thin slide

A

Thick film: drop of blood on glass slide to examine larger volume of blood and shows the presence of parasite.
Thin film: drop is spread across the slide and is useful for identification of species

53
Q

Advantages to malaria RDTs

A

Quick, no subjective component, no time delay, can do it at bedside

54
Q

Symptoms of Uncomplicated malaria

A 
Shaking and chills
High fever - paroxysmal
Excessive sweating
Extreme fatigue and sleep
May recur at regular intervals
Enlarged spleen, liver
Jaundice
Diarrhea/vomiting 
Anemia - usually mild
Abdominal pain
Normal WBC
Low platelets
No vital organ dysfunction
55
Q

Symptoms of Severe Malaria

A 
Severe anemia
Renal failure
Pulmonary edema or ARDS
Hypoglycemia
Cerebral malaria; coma, seizures, neurologic manifestations
Circulatory collapse or shock
Enlarged spleen, liver
Miscarriage, low birth rates
Micro-hemorrhages in eye
Death
56
Q

Neurologic consequences of severe malaria

A

Delirium: misperception of sensory stimuli; vivid hallucinations
Coma: unresponsiveness & cannot be aroused
Obtundation: less than full alertness
Stupor: deep sleep/unresponsiveness taking a lot to be aroused
Prostration: on the ground and cant get up

57
Q 
Specific consequences:
Anemia
Edema
Hypoglycemia
Low birth weight
Hypotension
A

Anemia: liver is slaughtering RBCs
Edema: INC alveolar permeability = fluid loss into lungs
Hypoglycemia: parasite consuming your glucose, not renewing
Low birth weight: due to DEC in nutrition
Hypotension: organs aren’t getting enough blood

58
Q

Common complications in pregnancy

A

Loss of blood and clogging of small placental vessels
Anemia INC maternal mortality
Low birth weight due to DEC in nutrition = INC risk infant death
Prematurity
INC risk of severe malaria

59
Q

Has there been good or bad progress in eliminating malaria?

A

Good

60
Q

What are major threats in controlling malaria?

A 
INC travel
Plasmodium drug resistance
Unstable political/social will
INC environmental disturbances
Insecticide resistance
Cross-border Malaria
Poorly trained man power
61
Q

What makes Vivax difficult to control?

A
  • Unique biology - hypnozoites in the liver
    • Asymptomatic in semi-immune populations
    • Responds differently to anti-malarials than falciparum
    • Poorly funded research
  • Mixed infections with falciparum
62
Q

Outbreak V endemic

A

Outbreaks: typically involves a village or group of villages
Endemic: entire district or ecotype

63
Q

3 main categories of disease spread

A
  1. Spread by direct contact between susceptibles
    1. Spread by insect vectors
  2. Water/soil/food borne
64
Q

Miasma theory

A

Miasma: bad smoke or mist that changed the air/atmosphere. Theory that miasmas got worse in hot climates, worse near swamps, stagnant water and decaying things. Draining swamps helped. This lead to sanitary reforms which was good but not causing malaria

65
Q

Leo Howard & Lewis Hackett

A

local ecology of malaria, not just one solution

66
Q

Merozoite
Hypnozoite
Gametocyte
Sporozoite

A

Merozoite invasive form that attack RBC; generated in vacuoles
Hypnozoite in vivax and ovale, remain dormant in liver
Gametocyte made by merozoites in humans; mosquito take blood meal and they mature in mosquito gut to make ookinetes that make new sporozoites; also survive in human and mosquito
Sporozoite motile infective form; born in mosquito and also live in human

67
Q

What causes end organ damage?

A

ischemia

68
Q

Duffy-Free RBCs

A

Does not affect RBC function; Vivax can’t find it

69
Q

Hemoglobin E

A

Deforms Hb & slows vivax
Hetero: no symptoms
Homo: mild anemia & enlarged spleen

70
Q

Thalessemia

A

Deforms Hb & slows vivax

71
Q

Ovalocytosis

A

RBC oval shaped and makes invasion difficult; may be asymptomatic, anemic, jaundice or gallstones

72
Q

Sickle Cell

A

Homo: death
Hetero: 90% reduction of death
Sickling of RBC = reduce cell invasion

73
Q

Best vector for falciparum

A

Anopheles gambiae female

74
Q

3 phases to intervene epidemic

A

Phase 1: early detection
- Weekly surveillance at sentinel sites; detection and control within 2 weeks
Phase 2: rapid increase
- Rapid increase in new cases
- Need to track spatial and temporal development; outbreak signature
Use epidemic wave to trace over time and space
Phase 3: Post epidemic period
- Transmission falls to usual low levels
- Short term impacts: economic negatives, behavior changes, devastated populations
- long term impacts: economic, political health resources are low; positive like good political change, improved sanitation and control

75
Q

Intrinsic v Extrinsic factors that affect burden of disease

A

Intrinsic factors: human (herd immunity), parasite (virulence), vector (mosquito species complex)
Extrinsic factors: environmental, control, socioeconomic (war, natural disaster, climate)

76
Q

Malaria dominates where

A

P. Malariae mostly throughout Africa
P. Vivax Central America, North Africa, Middle East, India, South America, SE Asia
P. Ovalae West Africa
P. Falciparum Africa, Haiti, Papua New Guinea, South America, SE Asia
Knowlesi - SE Asia, mostly around borders

77
Q

Environmental, human-related and biological factors for predicting malaria

A

Environmental factors: altitude, temperature, precipitation
Human related factors: land use, livestock, insecticide, socioeconomic status, gender, treatment, access
Biological factors: breeding sites, insecticide resistance, immunity, age

78
Q

Endemic, epidemic and decadal timescale prediction

A

Endemic areas: potential prediction of seasonal onset
Epidemic areas: prediction of outbreak
Decadal timescales: potential shift of epidemic areas to higher altitudes

79
Q

Timeline for Eradication

A

1 Preparatory phase
2 Attack phase - interrupt transmission: Vector control measures; Surveillance of disease
3 Consolidation phase - not as much efforts as attack phase: Mopping up remaining foci of infections
4 Maintenance Phase; 3 consecutive years without transmission

80
Q

Elimination v Eradication

A

Eradication: cessation of malaria parasite transmission and elimination of human reservoir - by extermination of infectious agent
Elimination: reduction to zero incidence of a specific disease in defined area

81
Q

Control v Extinction

A

Control: reduction of mortality and disease incidence until no longer a major public health problem
Extinction: no longer exists in nature or lab

Malaria (2 decks)

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