Prevalence and subtypes of Influenza A Viruses in Wild Waterfowl in Norway 2006-2007

Table 2 Prevalence of influenza A virus, separated by month, in wild waterfowl in Norway 2006-2007.

Year Month	2006 Ducks No. of positive/ No. of tested	2006 Gulls No. of positive/ No. of tested	2007 Ducks No. of positive/ No. of tested	2007 Gulls No. of positive/ No. of tested
August	2/102	1/47	14/186	7/123
	1.9%	2.1%	7.5%	5.7%
September	10/100	5/92	30/250	24/270
	10%	5.4%	12%	8.9%
October	23/137	5/68	43/204	7/87
	16.8%	7.4%	21.1%	8.0%
November	23/201	2/101	35/190	13/100
	11.4%	2.0%	18.4%	13%
December	2/86	9/291	9/73	1/34
	2.3%	3.1%	12.3%	2.9%
TOTAL	60/626	22/599	131/903	52/614
	9.6%	3.7%	14.5%	8.5%

The table gives the number of positive samples, the total number of samples tested as well as the prevalence in percent.

ISSN: 1751-0147