Table 2.

Scoring system of FCoV*-positive cells and relation to their immunopositivity for C1q, C9, CD46 and CD59.

FCoV*-positive cells
No immunopositive cells	0
Individual immunopositive cells	1
Individual aggregates of 10–30 cells per lesion	2
Multiple hotspots with >30 cells	3
Intrafocal, marginal and extrafocal immunostaining of CD46, CD59, C1q and C9 in lesions with FCoV*-positive cells
No immunopositive signal in the described area	0
Some cells and slight coloration in the described area	1
Some cells with medium staining in the described area	2
Very many cells with high-grade staining in the area described above	3
FCoV*-positive cells in relation to CD46 and CD59
No colocalization	0
Weak and/or sporadic colocalization with FCoV*	1
Strong and/or predominant colocalization with FCoV*	2
FCoV*-positive cells in relation to C1q and C9
Separate expression with partly small or blurred distance (1–2 cell layers) to FCoV*-positive cells	1
Separate expression exclusively at a clear distance from FCoV*-positive cells	2

* Feline Coronavirus.