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Introduction to Heartworm
flash cards for heartworms (dirofilaria immitis)
22
Veterinary Medicine
Not Applicable
08/23/2010

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Cards

Term
What is another name for dirofilaria immitis?
Definition
Canine Heartworm
Term
Where did canine heartworm start in the US?
Definition
Florida
Term
What are the definitive hosts for dirofilaria immitis?
Definition
Dogs, cats and ferrets
Term
Can humans become infected with dirofilaria immitis?
Definition
Yes
Term
What is the habitat of adult dirofilaria immitis?
Definition
The right ventricle and the pulmonary artery
Term
Dirofilaria immitis inhabits the lungs instead of the heart in which animals?
Definition
Humans and cats
Term
What is it called when there are no microfilaria when adult heartworms are present?
Definition
An occult infection
Term
How are adult dirofilaria immitis detected?
Definition
1. ELISA test
2. radiography
Term
How are microfilaria detected?
Definition
1. modified Knottā€™s test
2. filter technique
3. blood smear
4. hematocrit method
Term
At which larval stage does dirofilaria immitis become infective?
Definition
L3
Term
Which larval stage of dirofilaria immitis develop in the mosquito?
Definition
L1
Term
Which larval stage of dirofilaria immitis moves to the mouthparts of the mosquito so that it can infect a host?
Definition
L3
Term
How long does dirofilaria immitis remain in the connective tissue ?
Definition
4 months
Term
Which larval stage is the mature stage of dirofilaria immitis?
Definition
L4
Term
How long after initial infection do dirofilaria immitis produce microfilaria?
Definition
6-7 months
Term
What are the symptoms of heartworm infection?
Definition
1. lethargy
2. dry cough
3. exercise intolerance
Term
What medications are used to treat dirofilaria immitis?
Definition
1. moxidectin (ProHeart 6)
2. milbemycin (Sentinel and Interceptor)
3. ivermectin (Heartgard and Heartgard Plus)
4. selamectin (Revolution)
5. diethylcarbamazine (Filaribits)
Term
Heartgard should not be given to which breeds of dog?
Definition
The collie and the sheltie
Term
Which medication is used to treat adult heartworms?
Definition
Immiticide (melarsomine dihydrochloride)
Term
Is dipetalonema reconditum pathogenic?
Definition
No
Term
How are the microfilaria for dipetalonema reconditum and dirofilaria immitus distinguishable?
Definition
Body shape and movement.
D. reconditum is hook shaped with a broom stick handle anterior, and movement is snake-like
D. immitus is longer and wider, has a tapered anterior and coils and uncoils, wiggles and stays in one place.
Term
What is the main symptom of heartworm infections in cats?
Definition
Asthma
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