Clinical Impact of Infection with Pandemic Influenza (H1N1) 2009 Virus in Naïve Nucleus and Multiplier Pig Herds in Norway

Table 1

Distribution of observed clinical signs in different age groups in clinically positive herds. The number in brackets refers to percentage of herds with these signs in different age groups of pigs.

Clinical signs	Sows (%), 𝑛=17	Unweaned piglets (%), 𝑛=8	Weaned piglets (%), 𝑛=6	Growers, finishers, recruit sows (%), 𝑛=8
Coughing	5 (29.4)	5 (62.5)	6 (100)	5 (62.5)
Sneezing	4 (23.5)	4 (50.0)	5 (83.3)	4 (50.0)
Lethargy	7 (41.2)	3 (37.5)	2 (33.3)	2 (25.0)
Fever	6 (35.3)	NR	2 (33.3)	2 (25.0)
Decreased feed intake	12 (70.6)	2 (25.0)	2 (33.4)	4 (50.0)
Abortions	8 (47.0)
Stillbirths	5 (29.4)
Reduced litter sizes	8 (47.0)
Returns to estrus	9 (53.0)