Rats Diseases

Question 1

Answer 1

Innumerable filamentous bacteria are densely clustered at the ciliated surface of the columnar epithelium. Note the polymorphonuclear cell exudate in the bronchial lumen

Question 2

Answer 2

M. pulmonis infection in a rat

“Cobblestone” lungs

Polymorphonuclear exudate in lumen of airway while a chronic inflammatory infiltrate is present below the respiratory epithelium

Question 3

Answer 3

Edematous, swollen, and pale submaxillary salivary glands caused by coronaviral infection

Question 4

Answer 4

Spironucleus muris trophozoite

Question 5

Answer 5

E. muris cyst (8 nuclei)

Question 6

Answer 6

Syphacia muris cyst

Question 7

Answer 7

Aspicularis tetrapetra adult pinworm

Note prominent cervical alae extend all the way to the pharyngeal bulb

Question 8

Answer 8

R. nana adult tapeworm. Rostellum armed with hooks

Question 9

Answer 9

R. nana ova

Hooklets

Question 10

Answer 10

Radfordia ensifera

Myobia musculi

Question 11

Answer 11

Polyplax spinulosa

Question 12

Answer 12

Interstitial pneumonia due to P. carinii

Bands of lymphocytes and macrophages encircling interstitial vessels (black arrows)

Alveolar septa are thickened

Bronchioles (black star) are less affected than vessels