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!width="92%"|<center><u>'''Clinical Signs'''</u></center>
!width="92%"|<center><u>'''Clinical Signs'''</u></center>
|-
|-
−
|<center>'''Class 1'''</center>
+
|<center>'''Class I'''</center>
|'''Asymptomatic or mild disease'''
|'''Asymptomatic or mild disease'''
*Weight loss, reduced exercise tolerance or an occasional cough may be seen.
*Weight loss, reduced exercise tolerance or an occasional cough may be seen.
*No radiographic signs or laboratory abnormalities.
*No radiographic signs or laboratory abnormalities.
|-
|-
−
|<center>'''Class 2'''</center>
+
|<center>'''Class II'''</center>
|'''Moderate disease'''
|'''Moderate disease'''
*Animal coughs occasionally and shows mild-to-moderate exercise intolerance.
*Animal coughs occasionally and shows mild-to-moderate exercise intolerance.
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*Anaemia and proteinuria may be present.
*Anaemia and proteinuria may be present.
|-
|-
−
|<center>'''Class 3'''</center>
+
|<center>'''Class III'''center>
|'''Severe disease'''
|'''Severe disease'''
*Signs are variable but may include weight loss, exercise intolerance, tachypnoea, dyspnoea, severe/persistent coughing, haemoptysis, syncope, or ascites.
*Signs are variable but may include weight loss, exercise intolerance, tachypnoea, dyspnoea, severe/persistent coughing, haemoptysis, syncope, or ascites.
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*Anaemia, thrombocytopenia, and proteinuria are seen.
*Anaemia, thrombocytopenia, and proteinuria are seen.
|-
|-
−
|<center>'''Class 4'''</center>
+
|<center>'''Class IV'''</center>
|'''Caval syndrome'''
|'''Caval syndrome'''
*Sudden onset of collapse, haemoglobinuria, and respiratory distress.
*Sudden onset of collapse, haemoglobinuria, and respiratory distress.