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It starts with a tickle in your throat that becomes a cough.
你一開始是喉嚨癢，而后轉為咳嗽。
Your muscles begin to ache, you grow irritable, and you lose your appetite. It's official: you've got the flu.
肌肉開始疼痛，逐漸煩躁不安，并且喪失食欲。事實證明：你得了流行性感冒。
It's logical to assume that this miserable medley of symptoms is the result of the infection coursing through your body,
合理地推斷，這些多種難受癥狀是流經你身體的感染所導致，
but is that really the case?
但真的是那樣嗎？
What's actually making you feel sick?
到底是什么讓你覺得生病了？
What if your body itself was driving this vicious onslaught?
如果是身體自己不得不發起這猛烈的攻擊呢？
You first get ill when a pathogen like the flu virus gets into your system, infecting and killing your cells.
發病初起，像流感病毒類的病原體侵入你的身體，感染并殺死細胞。
But this unwelcome intrusion has another effect: it alerts your body's immune system to your plight.
但這令人討厭的入侵有另一效應：它讓身體的免疫系統警覺到這個危險的狀況。
As soon as it becomes aware of infection, your body leaps to your defense.
一旦它察覺到感染，身體會迅速啟動防衛。
Cells called macrophages charge in as the first line of attack, searching for and destroying the viruses and infected cells.
巨噬細胞會當攻擊先鋒隊沖向感染區，搜尋并殺死病毒及受感染的細胞。
Afterwards, the macrophages release protein molecules called cytokines
然后，巨噬細胞釋放稱為細胞因子的蛋白質分子，
whose job is to recruit and organize more virus-busting cells from your immune system.
它的任務是從免疫系統中動員并組織更多的搜捕病毒的細胞。
If this coordinated effort is strong enough, it'll wipe out the infection before you even notice it.
如果這協同作用力夠強，它甚至在你覺得生病前就會殲滅這感染。
But that's just your body setting the scene for some real action.
但這只是身體為真正的戰爭做準備而已。
In some cases, viruses spread further, even into the blood and vital organs.
某些狀況，病毒會進一步擴散，甚至侵入血液及重要器官。
To avoid this sometimes dangerous fate, your immune system must launch a stronger attack, coordinating its activity with the brain.
為避免這偶發的危險后果，免疫系統必須發動更強的反擊，協同腦部一起展開行動。
