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Table 1 Distribution of lesions and of S. suis serotype 2 as detected by culture and immunohistochemistry in 3 animals after aerosolic challenge.

From: Experimental Infection of Conventional Pigs with Streptococcus suis serotype 2 by Aerosolic Exposure

Tissue

Animals positive

Characteristic macroscopic and/or histologic lesions (Animals)

 

Culture

IHC

 

Nasal cavity

C

A,C

Mild, focal mucopurulent rhinitis (A,C)

Lung

-

A

Diffuse fibrinopurulent pleuritis (A,B); acute embolic pneumonia (A)

Bronchial lnn.

-

A

Follicular hyperplasia and exudation of heterophils (A,B)

Middle ear

C

B

Unilateral purulent otitis media and exudate in Eustachian tube (B)

Inner ear

n.d.

C

Bilateral purulent labyrinthitis and perineuritis (n. vestibularis) (C) – Fig. 1

Tonsil, pharyngeal

A,C

C

Focal exudation of heterophils (C)

Tonsil, soft palate

A,B,C

A,B,C

Heterophils in crypt epithelium and lumen (A,B,C)

Brain

C

C

Diffuse fibrinopurulent meningitis with focal submeningeal encephalitis (C)

Heart

A

A

Diffuse fibrinopurulent pericarditis (A)

Peritoneum

A

A

Diffuse fibrinopurulent peritonitis (A)

Mesenteric lnn.

-

A

Follicular hyperplasia and exudation of heterophils (A)

Liver

A

A

Multifocal, subcapsular hepatic necrosis and fibrinopurulent perihepatitis (A)

Spleen

C

A

-

Joints

A,C

A,C

Suppurative arthritis (A,C)

Blood

A

n.d.

-

  1. n.d.: not done; -: negative; IHC: immunohistochemistry for S. suis serotype 2; A,B,C: animal no.