TABLE 2.

Concentrations of airborne microorganisms measured in five types of swine houses of six swine farms in 2-day consecutive sampling

Material measured	Sampling house type	Concn (CFU/m3)			n
		Mean	SD	Range
Culturable bacteriaa	Breeding	496,827	423,831	59,533–1,316,410	24
	Farrowing	182,973	191,663	7,121–742,476	23
	Nursery	102,975	115,925	4,941–440,318	24
	Growing	127,213	146,552	214,813–717,421	24
	Finishing	756,244d	1,044,082	16,223–3,496,828	24
	Overall	334,509	571,663	4,941–3,496,828	119
Culturable gram-negative bacteriab	Breeding	50	93	4–674	61
	Farrowing	42	37	4–166	66
	Nursery	44	38	4–178	79
	Growing	75	82	4–450	74
	Finishing	452e	690	7–3,545	82
	Overall	143	372	4–3,544	362
Culturable fungic	Breeding	3,576	5,822	430–34,023	33
	Farrowing	3,014	1,931	603–7,111	36
	Nursery	2,297	1,341	283–6,214	36
	Growing	2,152	1,217	554–7,095	35
	Finishing	2,486	2,042	695–10,589	36
	Overall	2,693	2,948	283–34,023	176

^aCollected by AGI-30 samplers and then cultured on TSA medium at 30°C for 2 to 5 days. 

^bCollected on MAC medium by AMS and incubated at 30°C for up to 10 days. 

^cCollected on MEAS medium by AMS and incubated at 25°C for 5 to 7 days. 

^dP < 0.01 by Scheffe test compared to results for the farrowing, nursery, and growing stalls, respectively. 

^eP < 0.001 by Scheffe test compared to results for the other four types of stalls.