Pathogens Of Farm Animal Diseases

Visão Geral

Every disease a farm animal ever catches, from a cow going down with anthrax to a whole poultry flock wiped out by Newcastle disease, begins with the same event: a living organism too small to see invades the animal's body. WAEC calls that organism a pathogen, and sorts every pathogen a candidate is expected to know into just four families. Learn the four, learn how each one attacks, and every disease topic that follows in this section becomes a matter of recognising which family is at work.

In this lesson you will learn what a pathogen is, meet bacteria, viruses, fungi and protozoa in turn with the diseases each is best known for on a Nigerian farm, and understand, in plain terms, how each type of organism actually makes an animal sick. That mechanism, not just the name of the disease, is what lets you reason about a farm scenario you have never met before.

Objetivos

  1. Define a pathogen
  2. Classify pathogens of farm animal diseases
  3. Give examples of bacterial, viral, fungal and protozoan pathogens
  4. Explain how pathogens cause disease in farm animals
  5. State the diseases caused by named pathogens

Nota de Aula

A cattle rearer near Sokoto loses three cows within a day to sudden bleeding from the nose after death; a poultry keeper in Ogun loses forty birds in a week to twisted necks and greenish droppings. Two very different diseases, two very different invading organisms. Before any later topic in Animal Health can make sense, a candidate has to be able to name what kind of organism causes disease in the first place, because the class of pathogen decides how the disease spreads, how it is treated, and whether a vaccine can even be made against it.

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  1. A pathogen is best defined as: A. Any organism living inside an animal's body B. A living organism or agent capable of invading a host and causing disease C. A chemical used to treat sick animals D. Any external parasite such as a tick or mite Answer: B
  2. Anthrax in cattle is caused by: A. A virus B. A protozoan C. Bacillus anthracis, a bacterium D. A fungus Answer: C
  3. Newcastle disease of poultry is caused by which class of pathogen? A. Bacterium B. Virus C. Fungus D. Protozoan Answer: B
  4. Ringworm in farm animals is caused by a pathogen belonging to which class? A. Bacteria B. Viruses C. Fungi D. Protozoa Answer: C
  5. Coccidiosis and trypanosomiasis are diseases caused by pathogens of which class? A. Bacteria B. Viruses C. Fungi D. Protozoa Answer: D

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