Table 2.

Passive tracer concentrations in wards and nurse station.

		location
		8104	8109	8110	8111	8112	NS
case W-1T	kg′ kg−1 (%)	8.84 × 10−5 (97.7%)	1.92 × 10−5 (2.12%)	2.92 × 10−5 (7.06%)	6.39 × 10−5 (7.06%)	8.08 × 10−5 (8.93%)	3.01 × 10−5 (3.32%)
case W-1		8.88 × 10−4 (98.1%)	1.56 × 10−5 (1.72%)	2.62 × 10−5 (2.89%)	9.63 × 10−5 (10.7%)	1.04 × 10−4 (11.4%)	1.31 × 10−5 (1.45%)
case W-2		9.05 × 10−4 (100%)	4.21 × 10−5 (4.65%)	4.52 × 10−5 (4.99%)	1.22 × 10−4 (13.5%)	1.33 × 10−4 (14.7%)	1.55 × 10−5 (1.71)
case W-3		8.43 × 10−4 (93.2%)	1.48 × 10−5 (1.63%)	2.64 × 10−5 (2.91%)	6.02 × 10−5 (6.65%)	5.20 × 10−5 (5.74%)	7.12 × 10−6 (0.79%)
case WSW-1		6.15 × 10−4 (68.0%)	3.34 × 10−5 (3.69%)	2.07 × 10−5 (2.29%)	1.42 × 10−6 (0.16%)	6.01 × 10−7 (0.07%)	1.19 × 10−8 (0.00%)
case WSW-2		7.09 × 10−4 (78.3%)	4.61 × 10−5 (5.10%)	4.46 × 10−5 (4.93%)	3.25 × 10−5 (3.59%)	3.17 × 10−5 (3.50%)	5.72 × 10−7 (0.06%)
case WSW-3		4.77 × 10−4 (52.7%)	3.72 × 10−5 (4.12%)	3.13 × 10−5 (3.46%)	2.25 × 10−6 (0.25%)	1.54 × 10−6 (0.17%)	1.70 × 10−8 (0.00%)
attack rate		5/5	7/9	2/7	3/7	3/8	2/2