Tick-Borne Infectious Disease in U.S. Dogs

Tick-Borne Infectious Disease in U.S. Dogs

D i a g n o s t i c T r e e / PARASITOLOGY
Tick-Borne Infectious Disease in
Tick-borne disease suspected in a dog (fever, lethargy, lymphadenopathy, history of tick exposure)
Clinical Signs
Geographic Location
Northeast, Eastern
Seaboard, upper Midwest, West Coast
EHR, ANA, BOR, BAB
Central, eastern
states (OK, MO, AR,
MS, TN, NC, SC)
Epistaxis, petechiae,
ecchymoses
Coughing,
respiratory distress
Edema, vasculitis
of extremities (lips,
pinnae, scrotum)
EHR, RMS, BAB
EHR, ANA, RMS
ANA, RMS
RMS
Rocky Mountains,
Southwest
Southeast
EHR, BAB
EHR, RMS, BAB
Lameness
Effusive
(swollen) joint(s)
BOR
Mucous membrane
color
Joint pain,
noneffusive
EHR, ANA, RMS
Pale
EHR, ANA, BAB
Investigation
Diagnosis
Result
60 .............................................................................................................................................................................NAVC Clinician’s Brief / April 2010 / Diagnostic Tree
U.S. Dogs
Craig Datz, DVM, MS, Diplomate ABVP (Canine & Feline
Practice), University of Missouri
Complete Blood Count
Normal
Thrombocytopenia
Anemia
EHR,
ANA, RMS,
BAB
Mild to moderate
BOR
Red blood cell
inclusions (organisms)
present in blood
smear
Icteric
BAB, RMS
Large, piriform
(teardrop)
Small, round, oval,
ring-shaped
BAB
(B canis)
BAB
(B gibsoni)
Severe, hemolytic
BAB
White blood cell
inclusions (morulae)
present in blood
smear
Granulocytes
EHR
(E ewingii),
ANA
EHR, ANA,
RMS, BAB
Monocytes
EHR
(E canis)
ANA = anaplasmosis (Anaplasma phagocytophilum); BAB = babesiosis (Babesia canis, B gibsoni); BOR = borreliosis (Lyme disease; Borrelia burgdorferi );
EHR = ehrlichiosis (Ehrlichia canis, E ewingii); RMS = Rocky Mountain spotted fever (Rickettsia rickettsii)
Diagnostic Tree / NAVC Clinician’s Brief / April 2010 .............................................................................................................................................................................61