Table 4.

Virus demonstration in cats with FIP (Group II; a: cat No. 1–3, b: cat No. 4–12)

Cat No.	Ema	RT-PCRb
1	n.d.c	+d
2	(+/−)d	+
3	n.d.	n.d.
4	n.d.	+
5	n.d.	+
6	+	+
7	–d	+
8	–	+
9	+/−	–
10	+++	+
11	+++	+
12	+++	+

^aEM: electron microscopical demonstration of coronavirus particles in ingesta.

^bRT-PCR: nested FCoV RT-PCR on faeces (Herrewegh et al., 1995).

^cn.d: not done.

^d: negative result (no viral particles); +/−: single viral particles; +: few viral particles: ++: numerous viral particles; +++: abundant viral particles.