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1

Disease

a pathological condition of the body that presents a group of symptoms peculiar to it and which sets the condition apart as an abnormal entity differing from other normal or pathological body states

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Pathology

study of the nature and cause of disease which involves changes in the structure and function

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Pathologic

diseased

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Pathogenesis

origination and development of diseased

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Etiology

the study of the causes of disease

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Etiologic (agent)

pertaining to the cause of disease

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Epidemiology

the study of population medicine

science concerned with defining and explaining the interrelationships of factors that determine disease frequency and distribution

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Koch's Law

Determine cause and effect

criterion used in proving an organism is the cause of a disease or lesion

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Immunology

study of immune function

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Immunity

body's defense against disease

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Pathogen

a microorganism or substance capable of causing disease

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Parasite

an organism that lives within, upon, or at expense of another organism, known ad the host, without contributing to the survival of the host

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Saprophyte

living or growing in decaying or dead matter

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Commensal

providing benefits to each other

one or two organisms which live in an intimate, non-parasitic relationship; symbiosis

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Zoonosis

a disease that is communicable between humans and animals under natural conditions

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Infectious disease

can be spread from one animal to another or acquired from the environment and involve a pathogenic agent

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Non-infectious disease

are caused by a variety of mechanisms, but do not involve a pathogenic agent (ex. Ketosis)

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List some Non-infectious diseases

Metabolic disturbances
Nutritional imbalances
Hormonal disturbances
Inherited disorders
Toxic substances (lead, ingestion of toxic plants)

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Incubation period

the interval between the introduction of a pathogenic agent into the body and the occurrence if observable symptoms of the disease (2 days to 3 weeks)

No recognizable symptoms, but can still transmit disease = quarantine 3 weeks

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Morbidity

The number (%) of a herd or flock which show symptoms of the disease in the face of an outbreak

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Mortality

The number(%) of a herd or flock which die from the disease

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List some infectious disease agents

Parasited
Bacteria
Viruses
Rickettsia
Chlamydia
Mycoplasma

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DAMNNIITT scheme

Degenerative
Anomalous
Metabolic
Nutritional
Neoplasia
Infectious
Inherited
Traumatic
Toxic

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Predisposing causes of disease

Stress
Age
Nutritional
Heredity
Breed
Genus
Sex

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Stress

the most important cause.
Stress causes: heat/cold, inclement weather, poor shelter, poor nutrition/starvation, transportation, sever exercise, weaning, abuse, changes in feed, anxiety, fear and pain

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Age

younger animals are usually more susceptible due to lower degree of immunity

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Nutritional

lack of adequate nutrition results in lessened ability yo withstand exposure to pathogens and increases incidence of metabolic disease. Lack of certain minerals = disease

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Heredity

Hernia, crytorchidism, dwarfism, hydrocephalus

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Breed

skin pigmentation, photosensitization, squamous cell carcinoma

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Genus

hog cholera only in pigs