Table 2.

Asthma prevention of nandina leaf extract.

Symptom class	Negative control	Asthma model	Positive control (2 mg/kg)	Nandina leaf extract (1 g/kg)
I (no response)	6	0	5	4
II (dyspnea)	0	2	1	2
III (cough)	0	3	0	0
IV (death)	0	1	0	0