Changes

Chronic:

Chronic:

Affected animals can completely recover, Lesions may resolve within a week, or become necrotic and slough. Ear tips may also be lost.  

Affected animals can completely recover, lesions may resolve within a week, or become necrotic and slough. Ear tips may also be lost.  

The bacteria localises in joints causing of synovial membrane lining + plus hyperaemia and villus formation + lymphocyte and plasma cell infiltration resulting in '''chronic serofibrinous polyarthritis and also discospondilitis.

The bacteria localises in joints causing destruction of the synovial membrane lining, hyperaemia, villus formation and lymphocyte and plasma cell infiltration resulting in '''chronic serofibrinous polyarthritis.

Initially joints are hot and swollen leading to stiffness, lameness, and non-weight bearing on affected limbs.

Initially joints are hot and swollen leading to stiffness, lameness, and non-weight bearing on affected limbs.

**Joint lesions with erosion of articular cartilage, fibrosis and ankylosis

Additionally valvular lesions may develop in the heart causing chronic valvular endocarditis, vegetatic thrombosis of mitral valves and asymptomatic or congestive heart failure sometimes resulting in sudden death following stress.

*Chronic valvular endocarditis:

**Vegetatic thrombosis of mitral valves

**Asymptomatic or congestive heart failure and sudden death with stress

==Treatment==

==Control==

Hygience is very important to control eryipelas.  It is advisable to cull chronic cases which will be acting as carrier pigs infecting other animals. Additionally any pigs being treated should be isolated to reduce the spreas of disease.

Live attenuated or inactivated vaccines are also available. Immunity lasts for months and is normally given to recently weaned pigs or gilts and sows prior to service.

**Hygience

**Cull chronic cases

**Isolate affected pigs

**Live attenuated or inactivated vaccines