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not detect dehydration or decreased body condition, slightly pale conjunctival mucosa,
normal buccal mucosa and capillary refill, normal vaginal mucosa, normal heart rate and
respiratory rate, normal lymph nodes, rectal temperature 37.5 °C, presence of a tumor
mass focused on the right posterior mammary gland, a tick, petechia and ecchymosis were
observed in the abdominal region and petechia in the bilateral pinna. 2 ml of whole blood
was collected and extracted, placed in a tube with anticoagulant (EDTA) and
subsequently sent to the laboratory requesting blood count and hemoparasite analysis.
The application of the corresponding antiparasitic was also carried out. The results
obtained in the blood count were: HTO 52%, HB 17g/dl, erythrocyte 7,581,000,
leukocyte 9,850, platelet 150,000, MCV 67.2 fl, HCM 22.4 pg, CMHbC 33.3%.
Microfilariae were observed in the blood smear. A week after treatment, petechiae and
ecchymoses were no longer evident, and appetite returned to normal. The presence of
signs such as petechia and ecchymosis, in addition to thrombocytopenia, can be observed
in other infectious diseases. Therefore, the blood smear is an effective diagnostic
technique to determine the presence of hemoparasites. Canine heartworm disease is a
potentially zoonotic parasitic disease, due to the fact that many of the vectors are
anthropophilic, making it important to control and prevent this disease in dogs so that it
does not impact public health. It is recommended to perform other detection studies such
as serology, echocardiogram, radiography and epidemiology of the disease.
Keywords: Microfilaria - Female canine - Blood smear.
1. Introducción
Los hemoparásitos son agentes infecciosos transmitidos por vectores hematófagos que
requieren de la localización permanente, de al menos una de sus formas evolutivas, en el
sistema circulatorio o el tejido sanguíneo (Ruiz et al., 2019). La dirofilariosis canina es
una de las enfermedades hemáticas producida por la Dirofilaria immitis; la cual necesita
de hospedador intermediario como el mosquito culícido de los géneros Culex, Aedes y
Anopheles, principalmente (Rosa y Ribicich, 2012). Puede parasitar a caninos y felinos
domésticos, zorros, hurones, conejos, equinos e incluso al hombre.
Las localizaciones del parásito adulto en el canino se centran en grandes vasos (arteria
pulmonar y vena cava) y corazón (ventrículo derecho); donde se reproduce y elimina al