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Immunology > Hypersensitivity type 2 > Flashcards

Hypersensitivity type 2 Flashcards

1
Q

What is a hypersensitivity type 2 reaction defined as

A

Destruction of normal tissue/cells by antibody (specifically IgG or IgM) with activation of complement or antibody dependent cell cytotoxicity (using NK cells)

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2
Q

Common examples of hypersensitivity type 2 reactions

A

Blood transfusion reactions
Hemolytic anemia of newborns
Penicillin induced anemia
Some autoimmune disease

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3
Q

Why are red blood cells commonly affected in type 2 hypersensitivity reactions

A

Because they do NOT display MHC

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4
Q

Transfusions are performed with

A

Blood loss
Trauma
Surgery
Low RBC count

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5
Q

How high is the risk of a reaction to a blood transfusion

A

Species dependent because some species are able to receive “one free” transfusion without a risk of reaction (body has no antibodies/it was never sensitized to another blood type)

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6
Q

What is ACD (acid citrate Dextrose) solution used for

A

Used in blood collection as an anticoagulant and energy source for red blood cells

Often found in human blood collection packs

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7
Q

What is the formula for ACD solution

A

Trisodium citrate 22.0g
Citric acid (monohydrate) 8.0g
Dextrose (monohydrate) 24.6g
Distilled water to make it up to 1L

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8
Q

For each 100ml of blood collected, you need ___ml of ACD solution (pH 5.0)

A

15 ml

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9
Q

Blood group antigens: name often starts with a species code and EA (erythrocyte antigen) followed by a letter or number denoting the order of discovery, what is DEA1.1

A

DEA: dog erythrocyte antigen

1.1: first allele of antigen 1

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10
Q

A recipient of a blood transfusion may contain pre existing antibody as a result of;

A

Previous blood exposure or exposure through the diet

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11
Q

The risk of dietary exposure to a blood group antibody is species dependent, who is it often seen in and why

A

Cattle and some cats

Due to ingesting colostrum with antibodies

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12
Q

What is the mechanism behind a blood transfusion reaction

A

Pre existing antibody binds to the erythrocyte antigens and activates a complement reaction Causing

Hemolysis

Anaphylatoxin release and mast cell degranulation

Free hemoglobin (can cause secondary damage to the kidneys)

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13
Q

How do you prevent transfusion reactions

A

Cross matching

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14
Q

The most important cross matching technique is a major cross match, describe this

A

Using the donors RBCs and the recipients serum

Look for lysis (complement) and agglutination

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15
Q

What is a minor cross match (less important)

A

Donor serum and recipient RBCs

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16
Q

What are the signs of a mild to moderate transfusion reaction

A

sweating, salivation, diarrhea vomiting, increased RR/HR

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17
Q

What are the signs of a severe transfusion reaction

A 
Shock
Weakness
Hyperpnea 
Hypotension 
Collapse 
Death (arrhythmia or apnea)
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18
Q

What are the signs of the recovery phase of transfusion reactions

A

Hemoglobin from ruptured RBCs eventually converted to bilirubin

Icterus (yellowing) of mucosae and sclera

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19
Q

Describe blood transfusions in cattle

A

MANY blood types
Blood typing used to check parentage
Transfusions are often incompatible

Some cattle have pre-formed antibodies against foreign RBCs often due to dietary antigens

First transfusions last days to a week

Repeated transfusions needed for the shorter life of RBCs

20
Q

Dogs have no preformed antibodies against foreign RBCs, they do have many RBC antigens though, what is the major antigen in dogs that causes most problems with transfusions

A

Only one group, DEA 1 (strong antigen) (there is a card to test this antigen)

DEA 1.1 is a subgroup and the major cause of concern with DEA 1 dogs

40% of dogs are DEA 1.1 positive. They can receive blood from DEA positive AND negative dogs, making them universal blood recipients

21
Q

if DEA 1.1 (an ideally 1.2) positive dogs are universal recipients, what does that mean for DEA 1.1/1.2 negative dogs

A

Universal blood donors (don’t need to worry about most dangerous group of antigens)

Greyhounds are universal donors because most are DEA negative

22
Q

What happens when you transfuse a DEA 1.1 negative dog with a DEA 1.1 positive dog

A

First transfusion is “free” -it will be okay because there is no preformed antibodies but the body will start to make new antibodies for the next exposure

Transfusion reactions will be seen on subsequent transfusions

This is a common problem in puppies (neonatal isoerythrolysis)

23
Q

Recommended that you always ____ on subsequent transfusions in breeding bitches

A

Cross match

24
Q

Does antigen testing for strong antigens prevent:

A

Problems on first transfusions: yes

Problems on subsequent transfusions: yes (small risk of incompatibilities from minor antigens)

25
Q

Does cross matching first transfusion prevent problems with:

A

First transfusions: yes (test to see if recipient has antibodies to that blood)

Subsequent transfusions: no (you don’t know the blood type, and it doesn’t mean you can use the same blood from the first transfusion because it could have been sensitized from the first transfusion)

26
Q

True or false

Cross matching tells you the blood type of the animal

A

FALSE

it tells you if the recipients blood will react to the donors serum

27
Q

Antigen testing tells you what

A

Blood type

28
Q

Describe transfusions in horses

A

Many blood groups but only 2 are important

No preformed antibody unless previously exposed (one free transfusion)

Risk of reactions is like dogs except multiparous pregnant mares have a higher risk

29
Q

Describe blood transfusions in cats

A

Low incompatibility risk in North American domestic cats

Transfused RBCs last about 5 weeks

30
Q

Describe the blood groups of cats

A

Follow and non standard system, There is one gene with 3 alleles

a is dominant and gives blood type A

b is recessive, bb cats are type B blood

c is rare and gives type AB blood

99% of all North America domestic cats are the same blood type (A)

Siamese and Burmese -all type A

Persian and Himalayan are mixed, either A or B

UK cats: 40% are type A and 60% are type B

31
Q

Most cats possess IgM antibodies against type A antigens even though no previous transfusions probably due to

A

Dietary antigens

32
Q

A blood transfusion to a type B cat from a type A cat is destroyed in

A

Hours

33
Q

Some type A cats possess low amounts of antibody against Type B antigens, resulting in

A

Less severe transfusion reactions

34
Q

What is neonatal isoerythrolysis (AKA hemolytic disease of new borns)

A

Results a from ingesting colostrum rich with antibodies Against the neonates RBCs (antibody causing the problem is passively transferred)

Common problem in horses and mules, occasionally seen in cats dogs and sheep

35
Q

Describe how neonatal isoerythrolysis occurs in horses foals and mules

A

Occurs when:

  • stallion has a different blood group (antigens) from the mare
  • foal inherits some of these antigens from the dad and therefore has a different blood type from the mare

Aa and Qa antigens cause the most problems (others are weaker)

Dam is sensitized due to leakage of the foal blood from placental bleeding or at foaling or during previous transfusions and starts to make antibodies

Foal ingests colostrum from the mare that has antibodies against its blood type

36
Q

What breed of horses is neonatal isoerythrolysis especially common in

A

Thoroughbred mares that have had multiple foals

Affects 1% of foals

37
Q

Describe how a mule is created? Can it be the reverse situation

A

Mule: female horse and male donkey cross (large genetic difference making these animals sterile) there is a 10% rate of neonatal isoerythrolysis occurring with the birth of mules

Very rare in reverse (male horse and female donkey) very unlikely it will survive, if it does it’s called a Hinny

38
Q

What are the signs of hemolytic anemia when the foal ingests colostrum with antibodies

A

Initially pale and then icteric mucous membranes

May show hemoglobinuria

Weakness
Lethargy
Shock
Death

39
Q

How do you test for neonatal isoerythrolysis

A

PCV (mild: 0.15 to 0.25 L/L)
(severe: <0.15 L/L)

Jaundiced foal agglutination test: mares colostrum with foals RBCs (agglutination is positive)

Test mares blood during pregnancy for rising titers of antibodies against Aa or Qa antigens

40
Q

How do you treat neonatal isoerythrolysis

A

Prevent or stop colostrum ingestion for at least 36h (colostrum production will stop and give time for foal to correct anemia and make more RBCs)

Feed colostrum from another mare (best) or given serum from an unrelated horse

Blood transfusion if PCV <0.15 L/L (convenient source is washed RBCs from the dam (takes out serum)) (equine RBCs clump and separate from serum with time so this is easy)

41
Q

Describe neonatal isoerythrolysis in cats

A

Also called Fading Kitten Syndrome

Rare in north America more common in the UK (more type B cats)

Most likely seen when a blood group B queen is mated with a blood group A tom

Chance of this occurring is small if the queen is A and Tom is B

42
Q

Describe how neonatal isoerythrolysis occurs in cats

A

Blood type B queen x blood type A Tom

Queen with be genotype bb
Tom will be genotype ab or aa

Offspring will be

1) if Tom is ab: ab or bb (type a or b)
2) is Tom is aa: ab (type a)

Blood group A offspring at risk of this disease from the A antibody in the colostrum

43
Q

What are the signs of fading kitten syndrome

A

Icterus
Weakness
Paleness

44
Q

Describe type 2 drug hypersensitivities

A

Drug or it’s break down products bind to cells making them antigenic (labels cells as pathogenic and the body attacks them)

45
Q

Penicillin associated hemolytic anemia is rare but occasionally seen in

A

Horses

46
Q

Describe vaccines grown in tissue

A

Cattle killed BVD vaccine is grown on kidney cells

Contains potent adjuvant (causes an increased immune response)

Causes stimulated anti MHC antibody production

Antibody transferred to calves in colostrum and causes pancytopenia

Immunology (13 decks)

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