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Paramyxovirus
This U-Tube video below explains it all.
An excellent link:
http://www.pigeon-aid.org.uk/pa/html/paramyxovirus__pmv_.php
To the top
http://www.pigeon-aid.org.uk/pa/html/paramyxovirus__pmv_.php
To the top http://www.pigeon-aid.org.uk/pa/html/paramyxovirus__pmv_.php
To the top