Finding a cow is simple, but it is not that simple. What's more, it's even more difficult to find a cow with vaccinia virus from so many cattle.

However, the only benefit of ancient times was that he was never afraid of things that human resources could not solve. With Li Er's order, all the palace people of all sizes in the palace pounced on the army of searching for bulls, and they were looking for bulls captured from where the Turks were captured. Hard work paid off. Li Er really found forty or fifty sick cows. Of course, the next work could only be left to Zhang Nan, because this group of people didn't know what the cowpox virus looked like.

In fact, Zhang Nan didn’t know what this cow with vaccinia virus looked like. Zhang Nan himself followed the symptoms found in the system and searched one by one.

However, during the search process, Zhang Na discovered an embarrassing thing, because the symptom of the cow's virus is that there is a local ulcer on the cow's top part. So Zhang Nan could only check the selected cows next to each other, which gave Zhang Nan an illusion that he was choosing a concubine himself.

"Did Comrade Li Er choose this way when he chose a concubine?" Zhang Nan thought in a bad mood. Although he thought so, Zhang Nan quickly found the cows suffering from cowpox from the forties or fifty sick cattle, with as many as twenty.

Zhang Nan quickly reported this matter to Li Er, and Li Er was not vague and quickly divided the twenty sick cows.

After Sun Simiao had a rough understanding of how to use the cowpox virus, he also assigned his students. The residents of Chang'an City had been told that they would be cut by one person in the East and West City tomorrow.

Zhang Nan and Sun Simiao drove a sick cow to a small village where smallpox erupted.

Sun Simiao was driving the cow in front, while Zhang Nan was following behind. It was not that Zhang Nan didn't want to help this old "Medical King", but Zhang Nan didn't know how to drive the cow at all. Nowadays, the people are all locked up in Chang'an City, and there is no one to admit on the official road, not to mention admitting it, there is not even a ghost.

Sun Simiao was not idle when driving the cattle, but was asking Zhang Nan for advice humbly.

"You guys might as well take this opportunity to tell the old Taoist what this antibody is." Sun Simiao asked while driving the cow.

"Okay, since Zhenren Sun wants to listen, he will be ugly." Zhang Nan thought about it and decided to tell Sun Simiao some knowledge of modern medicine, because modern medicine is much more developed than traditional Chinese medicine.

It’s not that Zhang Nan believes that traditional Chinese medicine is like this. In some diseases that need conditioning, traditional Chinese medicine is naturally superior to Western medicine. However, in some acute diseases, traditional Chinese medicine seems to have a relatively small effect, so Zhang Nan decided to tell Sun Simiao these basic knowledge. After the opening of the Tang Dynasty Medical College, Zhang Nan hopes that the Tang Dynasty can advance together in traditional Chinese and Western medicine, and it is best to create a product of great fusion.

"Before talking about this antibody, we should talk about the human immunity first." Zhang Nan said.

"The old Taoist would like to hear it carefully." Sun Simiao said.

"Minister Sun must have discovered it a long time ago. Sometimes, although we are sick, such as headaches and fever, we can handle it by ourselves without hiring a doctor. Maybe we will get better after sleeping, right?" Zhang Nan asked.

"That's right, the old Taoist has known this long ago." Sun Simiao stroked his beard and said.

"People get sick because wind evil enters the body. People's illness does not require medicine and stone to cure it. It is because of the immunity in the body. To prevent diseases is to have antibodies in the body to fight against these wind evils." Zhang Nan gave an example casually. Zhang Nan couldn't explain something that was too scientific, so Zhang Nan could only explain his understanding to Sun Simiao.

"Well, it's reasonable. Then the effect of this medicine stone is the same as that of an antibody, right?" Sun Simiao asked back.

"That's right, Sun Zhenren is really a famous doctor." Zhang Nan was surprised. He didn't expect that Sun Simiao had such a strong ability to accept new things. After all, Sun Simiao was relatively old, and new things might mean rebellious for Sun Simiao.

"Different antibodies are like different drugs. Each one is unique and has different functions." Zhang Nan said.

Sun Simiao nodded.

Of course, Zhang Nan couldn't explain the remaining red and white cells in the human body, and some more finer things. However, Zhang Nan still exchanged a complete set of books on modern medicine for Sun Simiao from the system. As for the time when it appeared in it and foreigners, Zhang Nan believed that the system had already been very considerate and had all been hidden. Zhang Nan had already understood that as long as it appeared in books from the Tang Dynasty, the system could hide it very considerately.

Sun Simiao looked very excited about the books given by Zhang Nan, because Zhang Nan was shocked by Zhang Nan when he saw that Sun Simiao had jumped off the ox cart.

"Zhengren Sun, what's wrong with you?" Zhang Nan saw Sun Simiao jumping off the ox cart, and was so scared that he jumped down quickly to see if Sun Simiao had anything to do. Sun Simiao is so old, if there is a bump, it's a big problem. Zhang Nan pointed at Sun Simiao and pulled the medicine of the Tang Dynasty onto the track of modernization.

"Ah, it's okay, the old Taoist was just too excited to see these medical books. Although the old Taoist had read a lot of ancient prescriptions, it was the first time he had seen so many medical books." Sun Simiao explained with a smile.

"My friend, where did you get these medical books?" Sun Simiao is not interested in how Zhang Nan takes things from a distance, but is interested in the author of this medical book.

"Ah, these books, these books are summarized by our predecessors who travel through time. But my intention is not here, so I have learned the ten or nine orifices of medical skills, but I don't know anything." Zhang Nan said casually.

"Hey." Sun Simiao did not speak, obviously a silent resistance to Zhang Nan's disrespect for the fruits of his predecessors' labor.

Sun Simiao was driving the cow while reading books on the ox cart. The cow was obediently walking along the official road. Soon, Zhang Nan and Sun Simiao came to the village where the smallpox exploded. Sun Simiao was already an acquaintance here, but this time, Sun Simiao changed into Zhang Nan's protective clothing.

And Sun Simiao only finished reading the preface of the medical book given by Zhang Nan.

At this time, the village where smallpox exploded was dead silent. Although Zhang Nan knew that there were still people living in this village, the atmosphere in the village was indeed not very good.

Sun Simiao was already accustomed to this atmosphere, and just shouted loudly at the entrance of the village: "Dear people, I, Sun Simiao, are back again. This time, the old Taoist has a way to treat this smallpox."
Chapter completed!