Changes

A single serotype has been identified which typically has antigenic variations.

A single serotype has been identified which typically has antigenic variations.

Recent strains of the virus have been shown to cause systemic disease, where the initial upper respiratory signs are followed by:

Recent strains have been shown to cause systemic disease:

*Severe pyrexia

*Initial upper respiratory signs are followed by:

*Oedema, particularly of the head and limbs

**Severe pyrexia

*Skin ulcers

**Oedema, particularly of the head and limbs

*Icterus and Petchiae

**Skin ulcers

The mortality rate of recently emerging strains can be as high as 50%, and higher in cats over 1 year of age. Conventional vaccination are thought to be ineffective against these strains.

**Icterus and Petchiae

*Mortality of up to 50%, and higher in cats over 1 year of age

*Conventional vaccination ineffective

====Diagnosis====

====Diagnosis====