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The Yellow Emperor asked: In cases of *Lianggan* (Two-Channel Cold Invasion), what are the corresponding pulse and clinical manifestations? Qibo replied: In cases of *Lianggan* (Two-Channel Cold Invasion), on the first day, the Taiyang Channel (Greater Yang) and Shaoyin Channel (Lesser Yin) are both affected, resulting in headache, dry mouth, and vexation with fullness. On the second day, the Yangming Channel (Bright Yang) and Taiyin Channel (Greater Yin) are both affected, resulting in abdominal fullness, generalized fever, anorexia, and delirious speech. On the third day, the Shaoyang Channel (Lesser Yang) and Jueyin Channel (Terminal Yin) are both affected, resulting in deafness, retraction of the testicles, cold extremities, inability to take in fluids or food, unconsciousness, and death by the sixth day. The Yellow Emperor asked: If the five Zang organs are damaged, the six Fu organs are obstructed, and the Ying (Nutritive) and Wei (Defensive) Qi are not circulating, why does death occur three days after these conditions arise? Qibo replied: The Yangming Channel is the leader of the twelve meridians, and its blood and Qi are abundant. Therefore, even though the patient is unconscious for three days, it is only when the Qi of this channel is exhausted that death occurs.

This passage further elucidates the symptoms of *Lianggan* disease and the rationale for its fatal outcome. When both Yin and Yang channels are invaded internally and externally, the pathogenic factor spreads through all six channels of Yin and Yang from the first to the third day. The Yellow Emperor reasoned that since the pathogen has spread through all six channels, the internal and external Zang organs are damaged causing unconsciousness; the Fu organs are obstructed preventing intake of fluids; and the Ying and Wei Qi have ceased to circulate. Why, then, must one wait until the sixth day for death? Qibo explained that the Stomach meridian of Yangming possesses abundant Qi and Blood. Although the pathogen pervades the interior and exterior, the Qi and Blood of Yangming have not yet been exhausted; death occurs only on the sixth day when this Qi is fully depleted.

The Yellow Emperor asked: After a febrile disease has healed, there are sometimes residual symptoms. What causes this? Qibo replied: Residual symptoms occur because the patient forces themselves to eat while the heat is still intense. In such cases, although the main heat of the disease has subsided, residual heat remains latent within the body. This residual heat combines with the Qi generated from food (Grain Qi), and the two heats merge, resulting in residual symptoms. The Yellow Emperor asked: How should residual symptoms be treated? Qibo replied: One must assess the deficiency or excess of the condition and regulate the rebellious or smooth flow of Qi, which will ensure recovery. The Yellow Emperor asked: What dietary prohibitions apply during febrile diseases? Qibo replied: When the fever has slightly subsided, consuming meat may cause recurrence of the disease, and overeating may lead to residual symptoms; these are the prohibitions.

When a disease has just healed, residual pathogenic heat may remain latent in the blood and Qi without being noticed. Food intake boosts Grain Qi, causing it to combine with residual heat. Consequently, eating meat will likely cause the disease to recur, while excessive consumption of grains leads to lingering pathogens, resulting in a protracted illness that is difficult to resolve. Therefore, dietary restrictions are essential, and regulating the diet with thin rice gruel is paramount.