Changes

== References ==

== References ==

Blood, D.C. and Studdert, V. P. (1999) Saunders Comprehensive Veterinary Dictionary (2nd Edition), Elsevier Science <br>Bridger, J and Russell, P (2007) Virology Study Guide, Royal Veterinary College<br><span id="fck_dom_range_temp_1300977195600_418" />Paterson, S (2006) Skin Diseases of Exotic Pets, Blackwell Publishing<br>Roberts, W.A. and Carter, G.A.(1976) Essentials of Veterinary Virology, p. 171, Michigan State University Press, East Lansing, Michigan

Blood, D.C. and Studdert, V. P. (1999) Saunders Comprehensive Veterinary Dictionary (2nd Edition), Elsevier Science

Bridger, J and Russell, P (2007) Virology Study Guide, Royal Veterinary College  

Paterson, S (2006) Skin Diseases of Exotic Pets, Blackwell Publishing

Roberts, W.A. and Carter, G.A.(1976) Essentials of Veterinary Virology, p. 171, Michigan State University Press, East Lansing, Michigan