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That's where those unpleasant symptoms come in, starting with the surging temperature, aches and pains, and sleepiness.
那就是引起不適癥狀之所在開始時，體溫劇升、肌肉酸痛及昏昏欲睡。
So why do we experience this?
為什么我們有這感受呢？
When the immune system is under serious attack, it secretes more cytokines, which trigger two responses.
當免疫系統遭受嚴重攻擊，它會分泌更多細胞因子以激發兩種反應。
First, the vagus nerve, which runs through the body into the brain,
第一，迷走神經是從全身匯聚至腦部迅速地傳遞訊息到腦干，
quickly transmits the information to the brain stem, passing near an important area of pain processing.
它會通過處理疼痛的重要區域附近。
Second, cytokines travel through the body to the hypothalamus,
第二，細胞因子從全身運行到下視丘
the part of the brain responsible for controlling temperature, thirst, hunger, and sleep, among other things.
這部分的腦負責控制體溫、口渴、饑餓，及睡眠等等。
When it receives this message, the hypothalamus produces another molecule called prostaglandin E2, which gears it up for war.
當下視丘接收到訊息，它會制造另一種分子，稱為“前列腺素E2”，讓它進入備戰。
The hypothalamus sends signals that instruct your muscles to contract and causes a rise in body temperature.
下視丘發出信號指示肌肉收縮，因而導致體溫上升。
It also makes you sleepy, and you lose your appetite and thirst.
它也使你昏昏欲睡，以及喪失食欲和口渴感。
But what's the point of all of these unpleasant symptoms?
但所有這些不適癥狀有何意義呢？
Well, we're not yet sure, but some theorize that they aid in recovery.
這個我們還不確定，但有些推測它們會幫助復原。
The rise in temperature can slow bacteria and help your immune system destroy pathogens.
體溫升高可阻礙細菌以及協助免疫系統殺死病原體。
Sleep lets your body channel more energy towards fighting infection.
睡眠讓身體集中更多精力以對抗感染。
When you stop eating, your liver can take up much of the iron in your blood,
當停止進食，肝臟就能在血中吸收很多鐵，
and since iron is essential for bacterial survival, that effectively starves them.
因為鐵是細菌生存所必需的，如此可有效地使之匱乏。
Your reduced thirst makes you mildly dehydrated, diminishing transmission through sneezes, coughs, vomit, or diarrhea.
口渴感降低使身體呈現輕度脫水，減少經由打噴嚏、咳嗽、嘔吐或腹瀉的傳播。
