Source: Six Texts on Cold Damage (1445)

Indication: Exterior Wind-Cold (Tai Yang) transforming to heat inthe Interior (Yang Ming)

Symptoms: An exterior wind-cold presentation charachterized by increasing fever and decreasing chills, accompanied by headache, stiffness in the extremities, orbital eye pain, dry nose, irritability, insomnia

Tongue: normal or red + thin yellow coat; Pulse: floating, slightly surging

This is externally contracted wind-cold-dampness up against the body's deficient qi, which is unable to mount the fight against the pathogen. Thus the herbs in this formula are two-fold: expel pathogen and strengthen qi.