Table 2. Results of testing for picornavirus (PiPV-A/PiPV-B), astrovirus (AstV) and coronavirus (CoV) by RT-PCR on samples from feral pigeons (Oslo 2003) and wood pigeons (Akershus 2005).

	Number of positive samples
Population	PiPV-A	PiPV-B	AstV	CoV*	PiPV-A + PiPV-B	PiPV-A + AstV	PiPV-B + AstV	PiPV + CoV + AstV
Feral pigeons
Juvenile (n = 56)	8	13	53	0	1	8	13	0
Adult (n = 50)	3	9	31	2	0	2	5	1
Unknown (n = 1)	0	0	1	0	0	0	0	0
Virus detection rates	10.3%	20.6%	79.4%	1.9%	0.9%	9.3%	16.8%	0.9%
Wood pigeons
Juvenile (n = 1)	0	0	1	0		0	0	0
Adult (n = 8)	0	0	5	0		0	0	0
Virus detection rates	0.0%	0.0%	66.7%	0.0%		0.0%	0.0%	0.0%

*The CoV results from feral pigeons are taken from an earlier study by Jonassen et al., 2005 [9].