Affections Of Specific Parts and Organs of Food Animals

- XI Affections of the Lymphatic System

1.Lymphadenitis

Causative agent:

a)     Acute lymphadenitis is manifested by swelling, congestion and edema of the node, which is painful and softer than normal e.g. Anthrax, and acute swine fever.

b)     Chronic lymphadenitis is manifested by the development of fibrous connective tissue in the affected node, which becomes enlarged and indurated. These changes may be seen in caseous lymphadenitis of the sheep, TB and actinobacillosis of the cattle.

Judgment: Condemn affected lymph nodes; total condemnation if generalized.

2.Pigmentary Changes

Causative agent: Anthracosis, xanthosis, melanosis

Judgment: Condemn affected nodes.

3.Parasitic Infestation

Causative agent: Linguatula, Muellerius, F. hepatica

Judgment: Condemn affected nodes.

4.Lymphangitis

Causative agent: Johne’s disease, mycotic lymphangitis

Judgment: Condemn affected vessels and associated tissues.