Bovine Arachnids

Question 1

Amblyomma spp.-Common Name

Answer 1

Ixodid ticks–

Lone star tick, Gulf Coast tick, Tropical bont tick, Bont tick

Question 2

Amblyomma spp.-Hosts

Answer 2

Humans, livestock, dogs, cats

Question 3

Amblyomma spp.-Identification

Answer 3

Very long palps and hypostome, ornate, banded legs

A. americanum “lone star tick” has single white spot on female scutum

Question 4

Amblyomma spp.-Life Cycle

Answer 4

ELNA

3 host tick, eggs in environ.

Question 5

Amblyomma spp.-Site of Infection

Answer 5

Head, ears, and neck

Question 6

Amblyomma spp.-Pathogenesis and Lesions/Clinical Signs

Answer 6

Long mouthparts = painful bites
Transmits diseases:
-Rickettsial (eg heartwater)
-Hepatozoon americanum by ingestion of A. meculatum

Question 7

Amblyomma spp.-Diagnosis

Answer 7

Id tick

Question 8

Amblyomma spp.-Treatment and Prevention

Answer 8

several parasiticides effective, difference if lactating dairy cattle

Question 9

Rhipicephalus (Boophilus) spp.-Common Names

Answer 9

Blue tick or cattle tick
R. annulatus: cattle fever tick
R. microplus: tropical cattle tick

Question 10

Rhipicephalus (Boophilus) spp.-Hosts

Answer 10

Cattle, other large hosts

Question 11

Rhipicephalus (Boophilus) spp.-Identification

Answer 11

Hexagonal basis capituli, prominent dorsal ridges on palps, short hypostome/palps

Question 12

Rhipicephalus (Boophilus) spp.-Life Cycle

Answer 12

ELNA
1 host tick
do fall off to lay eggs in the environ.

Question 13

Rhipicephalus (Boophilus) spp.-Site of Infection

Answer 13

Adults on ventral aspects of body

Immatures on ears

Question 14

Rhipicephalus (Boophilus) spp.-Pathogenesis and Lesions/Clinical Signs

Answer 14

Bovine piroplasmosis/Cattle fever: Babesia bigemina

Gallsickness: Anaplasma marginale

Question 15

Rhipicephalus (Boophilus) spp.-Diagnosis

Answer 15

Id tick

Question 16

Rhipicephalus (Boophilus) spp.-Treatment and Prevention

Answer 16

Parasiticides effective, difference if lactating dairy cattle
Suspected tick are submitted/reported to regulatory veterinarian

Question 17

Otobius spp.-Common Name

Answer 17

Argasids (soft tick)

Spinose ear tick

Question 18

Otobius spp.-Hosts

Answer 18

Livestock, humans, dogs

Question 19

Otobius spp.-Identification

Answer 19

Mouthparts not visible from dorsal surface, integument with short sharp spines

Question 20

Otobius spp.-Life Cycle

Answer 20

ELNA
Larvae and Nymphs on the host in the ear
Adults in the barn–>must treat the barn!
Larvae and nymphs are “taxi-ed” long distaces

Question 21

Otobius spp.-Site of Infection

Answer 21

Larvae and nymphs in ears

Adults are nonparasitic

Question 22

Otobius spp.-Pathogenesis and Lesions/Clinical Signs

Answer 22

Large numbers of ticks can cause severe inflammation and rupture ear drum, anemia, loss of conditions

Question 23

Otobius spp.-Treatment and Prevention

Answer 23

Topical use of acaricidal application in ear canals, treat premises

Question 24

Otobius spp.-Diagnosis

Answer 24

Id tick

Question 25

Sarcoptes scabiei-Common Name

Answer 25

Sarcoptic mange mite, itch mite, neck and tail mite

Question 26

Sarcoptes scabiei-Hosts

Answer 26

All domestic animals and humans-->largely host specific | *Zoonosis

Question 27

Sarcoptes scabiei-Identification

Answer 27

Round, 500um, short legs

Question 28

Sarcoptes scabiei-Life Cycle

Answer 28

ELNA Tunnel in the epidermis, resurface and burrow again Entirely on host

Question 29

Sarcoptes scabiei-Site of Infection

Answer 29

Epidermal layers of skin

Question 30

Sarcoptes scabiei-Pathogenesis and Lesions/Clinical Signs

Answer 30

Potentially most severe cattle mange Mild infection--scaly skin Severe infection--thickened skin, downgrading of hides, drop in meat and milk production

Question 31

Sarcoptes scabiei-Diagnosis

Answer 31

Skin scraping

Question 32

Sarcoptes scabiei-Treatment and Prevention

Answer 32

MCLs, eprinomectin approved for lactating dairy cattle | MUST be reported to authorities

Question 33

Chorioptes bovis-Common Name

Answer 33

Chorioptic mange mite

Question 34

Chorioptes bovis-Hosts

Answer 34

Cattle, small ruminants, equids

Question 35

Chorioptes bovis-Identification

Answer 35

Rounded mouthparts, sucker shape at end of stalks

Question 36

Chorioptes bovis-Life Cycle

Answer 36

ELNA | Non-burrowing, feeds on skin surface and epithelial debris, Female lives 4-6wks and lays about 90 eggs

Question 37

Chorioptes bovis-Site of Infection

Answer 37

Tailhead, udder and legs

Question 38

Chorioptes bovis-Pathogenesis and Lesions/Clinical Signs

Answer 38

Late winter, mild condition | Damages hides

Question 39

Chorioptes bovis-Diagnosis

Answer 39

Skin scraping

Question 40

Chorioptes bovis-Treatment and Prevention

Answer 40

MCLs in lactating dairy cattle | Standard louse treatments