Any condition that causes deviation from the normal state of animal. It is a condition where the system of animal is not function properly.
- Disease may be infectious or non-infectious.
Are illness that are contagious , meaning they can be spread from one animal to another. infectious diseases are caused by microorganisms called pathogens. Bacterial and viral infections are common causes of infectious diseases.
- BACTERIA – are simple , single- celled microorganisms . live in air , soil, food , and on the bodies of animals and plants. Some bacteria injure cells by giving of poisons called toxins. Ex. Cholera , Tuberculosis , Tetanus , Diphtheria , Typhoid fever
- VIRUSES – are the smallest pathogens . A virus can multiply only after entering in a living cell . The virus then takes over the cell’s reproductive mechanisms, resulting in cell damage or death. Ex. Rabies , Foot and mouth disease, Lumpy skin disease , Hog cholera
- FUNGI- organisms such as yeast , moulds and mushrooms are known as fungi. Fungi grow in warm , dark, and moist areas. Ex. Cryptococcosis , aspergillosis
- PROTOZOANS – have the ability to move through fluids in search of food. Ex. Trichomoniasis , coccidiosis
HOW PATHOGENS CAN SPREAD
Pathogens can spread through contact with –
- An infected animal
- An infected person
- Contaminated food and water
- Contaminated soil
Pathogens can enter into the body through breaks in skin or through the moist lining of the eyes , ear, nose , mouth, and other openings.
It is not spread by contagious. It is because of –
- Poor nutrition
- Birth defects