"Sun Zhenren, calm down." Zhang Nan looked at the excited Sun Simiao and said, this old man is simply a medical idiot, the medical idiot is not terrible, the terrible thing is that Sun Simiao is still a medical idiot who cares about the people of the world, so as long as he encounters something that can benefit the people, Sun Simiao will become very excited.

After Zhang Nan's reminder, Sun Simiao found that he was a little out of order.

"I'm sorry, the old man was too excited to see this magical method for a while, and I hope Xiaoyou won't be surprised." Sun Simiao straightened up and said.

"Let's talk about this pharmaceutical matter later, Sun Zhenren should see the prince first, I think the prince is not smallpox, but I can't be sure, let's let Mr. Sun take a look." Zhang Nan said.

"Yes, yes, yes, Cheng Qian, quickly let Sun Zhenren give you the number and pulse." Li Er was also anxious, after all, whether Li Chengqian was sick or not was very important.

Sun Simiao nodded, and soon did Li Chengqian's side to take the pulse of Li Chengqian, and after a while, Sun Simiao said: "Back to Your Majesty, the minister thinks that His Royal Highness the Crown Prince is not infected with smallpox, but just occasionally feels cold." ”

As soon as Sun Simiao spoke, Li Er immediately breathed a sigh of relief.

"Thank you Mr. Sun, since Cheng Qian is not infected with smallpox, I am relieved." Li Erdao.

"Your Majesty, the ministers have something to ask for." Sun Simiao ignored Comrade Li Er's thanks, but instead made a request.

"Mr. Sun, but it doesn't hurt to say it." Li Er knew that Li Chengqian was not infected with smallpox, and his heart immediately settled in his stomach and begged, and Li Er naturally did not refuse Sun Simiao's request.

"The minister hopes to take Zhang Nan with him to the village where smallpox broke out to treat the sick." Sun Simiao solemnly arched his hand at Li Er and said.

"What?!" Now not only Zhang Nan, but Li Er also didn't understand Sun Simiao's request.

"I'm afraid Sun Zhenren is not joking, this Qingquan doesn't understand medical science at all, how can this help Sun Zhenren treat patients." Li Er asked.

"Your Majesty, if when discussing the elixir and immortality, the minister was suspicious of Qingquan's medical skills, then today when he saw the medicine for typhoid fever that Qingquan took out, the minister was already convinced, Qingquan's medical skills must be above the old man." Sun Simiao said excitedly.

"Eh, Sun Zhenren, I really don't know how to heal, Mr. Sun really misunderstood." Zhang Nan doesn't know how to explain this antiviral granule medicine to this stubborn old man now, after all, it was replaced from the system, and if Sun Simiao said that he wanted medicine or some medical facilities, then Zhang Nan would be able to get it for Sun Simiao even if he lost his money, but now that Sun Simiao is pulling himself to treat the disease, Zhang Nan has no choice.

Sun Simiao looked at Zhang Nan's appearance, and thought that Zhang Nan was unwilling to show his precious medical skills, so he didn't hesitate much, and knelt down with a plop, the Tang Dynasty was not the Qing Dynasty, and kneeling was not a ritual, kneeling was already the highest etiquette, not to mention that Sun Simiao's age was already a grandfather's generation for Zhang Nan, and this kneeling frightened Zhang Nan.

"Sun Zhenren, what are you doing, hurry up, I can't afford it." Zhang Nan said as he pulled Sun Simiao up, but Sun Simiao didn't move, but said: "Lao Dao is not kneeling for himself, Lao Dao is kneeling for those patients who are infected with smallpox in the village, Qingquan, Lao Dao knows that you have the ability to save the world, Lao Dao begs you, just help those patients." Sun Simiao looked at Zhang Nan with a sincere face.

"Sun Zhenren, I ......" Zhang Nan really has no way to explain, Sun Simiao is the heart of a doctor's parents, but he really doesn't know anything, there is just a system, and Zhang Nan has also checked the information about smallpox, although smallpox is the only infectious disease that has been eliminated by humans in the world in later generations. However, being eradicated does not mean that it can be cured, and even in later generations, smallpox is still a virulent infectious disease that can only be prevented, not cured.

"Sun Zhenren, you get up and speak first, I will tell you, this smallpox is really incurable, once it is infected, it is certain death, there is no possibility of cure, this disease can only be prevented, not cured." Zhang Nan paused when he said this, and suddenly remembered something.

"Xiaoyou, are you saying that there is a possibility of preventing smallpox?" When Sun Simiao heard Zhang Nan say this, he immediately stood up excitedly.

Zhang Nan, on the other hand, stopped pulling, waved his hand, and showed a thoughtful look.

As a modern person who grew up in the new century, Zhang Nan has naturally been vaccinated against cowpox, and it is also common sense for everyone to prevent smallpox with cowpox vaccine, so can you also vaccinate the people who are not infected with the disease in Datang now?

Zhang Nan felt that this method was feasible, so he immediately began to search for cowpox vaccine in the system, but soon, Zhang Nan gave up this method of vaccinating the people of Datang for no other reason, that is, the systematic vaccine was too expensive.

But did you really just give up? Zhang Nan thought about it in his heart, and soon Zhang Nan began to search for questions about the cowpox vaccine in the system, and as Zhang Nan expected, it really made Zhang Nan find some eyebrows.

Although the production and manufacturing of vaccines is something that cannot be done by the existing Datang, Zhang Nan has thought of a local method.

The vaccinia vaccine is made with the vaccinia virus, and it cannot be vaccinated now, but it can be infected with the virus, Zhang Nan thought so, and Zhang Nan himself has just checked it in the system, if a person is infected with the vaccinia virus, it will only cause slight discomfort and produce resistance to the cowpox virus. Since the vaccinia virus has the same antigenic properties as the smallpox virus that causes smallpox disease in humans, people can also acquire immunity against smallpox virus after vaccinia vaccination.

Thinking of this, Zhang Nan suddenly became excited, with this local method, even if there is no vaccine, the people of Datang can also prevent smallpox.

"Clear Spring? Spring? Sun Zhenren is asking you. Li Er called out to Zhang Nan who was in a daze.

"Huh?" Zhang Nan was called like this by Li Er, and Zhang Nan came back to his senses.

"Sun Zhenren asked you if there was really a way to prevent smallpox." Li Er repeated Sun Simiao's question.

"This, don't hide it from Your Majesty, the minister really thought of a method, and the minister thinks that this method is feasible." Zhang Nan said.

"Oh? What is the method, let's talk quickly. Li Er was also excited, and Zhang Nan looked at Li Er, I told you this, you can't understand it. Li Er quickly understood the meaning of Zhang Nan's eyes, and immediately slapped Zhang Nan's helmet again.