Atlas of pathology

Neck oedema

Where: skin and subcutaneous tissue

Caused by: Anthrax

This lesion is the typical presentation in pigs of the ancient animal disease known as anthrax, caused by the large bacterium Bacillus anthracis. Affected pigs are usually older outdoor pigs, which are dull, not eating, with a firm, hot and painful swelling across their throat, neck and lower face. At autopsy, the neck and throat have firm gelatinous oedema fluid, with extensive infiltration of neck and jaw tissues with clear bloody wine-like fluid and gelatinous material. The local lymph nodes are greatly enlarged and oedematous, whereas internal organs including the liver and spleen appear relatively normal. It is important to confirm any suspicious deaths by staining and examination of dry smears of the lymph node and dark fluids in the neck. This smear diagnosis is often difficult in pigs, so it is also important to culture the lymph nodes. Anthrax bacteria occur in the soil only in defined endemic regions, so unless pigs are raised outdoors in those areas, the disease is rare. However, when it is does occur, it is usually a major dramatic episode, because of the strong ability of anthrax to cause public fear in humans. It is often difficult to easily dispose of affected pigs in a practical manner. In general, they should be destroyed on site by incineration.

Steven McOrist
Where

cardiovascular system

digestive system

intestines

liver

mouth

stomach

genitourinary system

bladder

female genitourinay tract

kidney

male genitourinay tract

mammary gland

lymphatic system

lymph nodes

spleen

thymus

tonsils

musculoskeletal system

nervous system

other

respiratory system

lungs

nasal cavity

skin and subcutaneous tissue

Disease

Diseases caused by bacteria

App

Clostridium novyi

Clostridium perfringens

Mycoplasma suis

Actinobacillosis

Anthrax

Atrophic Rhinitis

Bordetelosis

Brucellosis

Colibacillosis

Colitis

Edema disease

Enzootic Pneumonia (EP)

Erysipela

Exudative Epidermitis

Glässer disease

Ileitis

Leptospirosis

Mycoplasmal arthritis

Pasteurellosis

Salmonellosis

Streptococcal infections

Swine dysentery

Tuberculosis

Yersinia infection

Diseases caused by virus

African swine fever

Aujeszky's disease

Blue eye disease

Classical Swine Fever

Encephalomyocarditis

Foot-and-mouth disease

Influenza

Japanese B Encephalitis

Nipah virus disease

Porcine circovirosis

Porcine cytomegalovirus infection

Porcine epidemic diarrhea

Porcine parvovirus infection

Porcine respiratory coronavirus infection

PRRS

Rotavirus infection

Transmissible gastroenteritis

Diseases caused by parasites

Ascariasis

Coccidiosis

Mange

Metastrongylosis

Trichinellosis

Trichuriasis

Other

Epitheliogenesis imperfecta

Frostbite

Gastric ulcers

Hernias

Osteochondrosis

Other

Pityriasis rosea

Prolapse of the vagina and cervix

Rectal prolapse

Rectal stricture

Shoulder ulcers

Splay leg

Sunburn

Thrombocytopaenic purpura

Torsion of the stomach and the intestines

Uterine Prolapse

Vice

Nutritional deficiencies

Biotin deficiency

Mulberry heart disease

Toxicoses

Aflatoxicosis

Ergotism

Fumonisin toxicosis

Zearalenone toxicosis