Table 3.

Microbiological results from nasopharynx swabs in children with acute bronchiolitis treated at hospital in Oslo, Norway, before and after introduction of new treatment guidelines in 2013

	2009	2014	2017
	n=303	n=278	n=286
RS-virus (n (%))	181 (59.7)	206 (74.1)	214 (74.8)
Rhinovirus (n (%))	*	126 (45.3)	117 (40.9)
Other viruses (n (%))	63 (20.8)	78 (28.1)	73 (25.5)
Bacteria (n (%))	5 (1.7)	0 (0.0)	4 (1.4)
Two or more agents (n (%))	11 (3.6)*	79 (28.4)	56 (19.6)
Negative results (n (%))	87 (28.7)*	16 (5.8)	12 (4.2)

*Rhinovirus was not tested for in 2009.

RS-virus, respiratory syncytial virus.