Having Meat with Soy Sauce

"Hello, Dr. Wang," said the middle-aged man. 

"How can I help you?" asked Wang Yao. 

"The person you saw yesterday is having a headache again. It got worse," said the middle-aged man. 

"What? That's not possible," said Wang Yao. He was shocked. 

He understood the patient's condition. He didn't think his condition was too serious. The patient just had a headache. The cold toxin had been expelled after the message therapy. It was impossible to relapse in such a short period of time. 

"Where is the patient?" asked Wang Yao. 

"He's just outside," said the middle-aged man. 

"Take him to the clinic," said Wang Yao. 

"Okay," said the middle-aged man. 

He notified his mother, then went to the clinic. 

It was the same patient, but he looked completely different. In one day, the patient's face had started to turn dark green. His breathing was extremely shallow. He was unsteady on his feet.