Finding a job with cattle is easy to say, but it's not that simple, let alone finding a cow with cowpox virus from so many cattle, which is even more difficult.

However, the only advantage in ancient times is that they are never afraid of things that cannot be solved by manpower, Li Er's order, all the palace people in the palace are all in the army of looking for cattle, and they are looking for cattle from where the Turks are captive, and the hard work pays off, and Li Er really found forty or fifty sick cows, of course, the next work can only be handed over to Zhang Nan to do, because this group of people does not know what the cowpox virus looks like.

In fact, Zhang Nan didn't know what the cow with the cowpox virus looked like, and Zhang Nan himself looked for the cows one by one according to the symptoms found in the system.

But in the process of searching, Zhang Na found an embarrassing thing, because the symptom of vaccinia virus is a local ulcer on the ** part of the cow. So Zhang Nan could only check the selected cows next to each other, which gave Zhang Nan the illusion that he was choosing a concubine.

"Is this how Comrade Li Er chose his concubine when he chose it?" Zhang Nan thought evilly, although he thought so, Zhang Nan quickly found out the cows with cowpox from the forty or fifty sick cows, as many as twenty.

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

After Sun Simiao had a general understanding of how to use this cowpox virus, he assigned his students to it, and the residents of Chang'an City had been told that they would be unified in the East and West Cities tomorrow.

And Zhang Nan and Sun Simiao drove a sick cow to a small village where smallpox broke out.

Sun Simiao was driving the cattle in front, and Zhang Nan was following behind, not that Zhang Nan didn't want to help this elderly "medicine king", but Zhang Nan didn't know how to drive cattle at all. Now the people are all locked up in Chang'an City one by one, don't say they recognize it on the official road, and there is not even a ghost.

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

"Xiaoyou, why don't you take this opportunity to tell Lao Dao what this antibody is." Sun Simiao asked while driving the cow.

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

It's not that Zhang Nan thinks that Chinese medicine is good, in some diseases that need to be regulated, it is natural that Chinese medicine is better than Western medicine, but in some acute diseases, Chinese medicine seems to play a relatively small role, so Zhang Nan still decided to tell Sun Simiao these basic knowledge, and after the opening of Datang Medical College, Zhang Nan hopes that Datang can go hand in hand in Chinese and Western medicine, and it is best to come up with a product of great integration.

"Before talking about this antibody, we still have to talk about this human immunity." Zhang Nan said.

"The old way is willing to hear about it." Sun Simiao said.

"Sun Zhenren must have discovered it a long time ago, in some cases, although we are sick, such as a headache and brain fever, we don't need to ask a doctor, we can carry it by ourselves, maybe it will be good to sleep and get sick, right." Zhang Nan asked.

"That's right, the old way knows this for a long time." Sun Simiao stroked his beard and said.

"People get sick because the wind evil enters the body, and people's diseases can be cured without medicinal stones, because there is immunity in the body, and to prevent diseases, there are antibodies in the body to fight these wind evils." Zhang Nan casually gave an example, Zhang Nan couldn't talk about things that were too scientific, Zhang Nan could only tell Sun Simiao about his understanding.

"Well, it makes sense. Then this medicine stone has the same effect as an antibody, right? Sun Simiao asked rhetorically.

"That's right, Sun Zhenren is really a famous doctor." Zhang Nan was pleasantly surprised, he didn't expect Sun Simiao's ability to accept new things so strongly, after all, Sun Simiao is relatively old, and new things may mean deviance for Sun Simiao.

"Different antibodies are like different drugs, each one is unique, and the effect is also different." Zhang Nan said.

Sun Simiao nodded.

Of course, the rest is like red and white blood cells in the human body, and there are some finer things Zhang Nan can't explain, but Zhang Nan still swapped out a complete set of books on modern medicine from the system to Sun Simiao, as for the time when it appeared and foreigners, Zhang Nan believes that the system has been very intimate and all the things have been hidden, and Zhang Nan has also seen that as long as it is something that appears in the book after the Tang Dynasty, the system can hide it very intimately.

Sun Simiao flipped a few pages of the book given by Zhang Nan, and seemed very excited, because Zhang Nan saw that Sun Simiao had jumped off the ox cart, which frightened Zhang Nan.

"Sun Zhenren, what's wrong with you." Zhang Nan saw Sun Simiao jumping off the ox cart, and he was so frightened that he hurriedly jumped down to see if Sun Simiao had anything to do, this Sun Simiao is so old, in case there is a stumble, but it is a big problem, Zhang Nan also pointed to Sun Simiao to put Datang's medicine on the track of modernization.

"Ah, it's okay, it's okay, Lao Dao is just too excited to see these medical books, although Lao Dao has read a lot of ancient prescriptions, but this is the first time I have seen so many medical books." Sun Simiao explained with a smile.

"Little friend, where did you get these medical books?" Sun Simiao is not interested in how Zhang Nan retrieved things from the air now, but is interested in the author of this medical book.

"Ah, these books, these books are summarized by our predecessors who have crossed a discipline, but I am not here, boy, so for medical skills, I know nine out of ten, and I don't know anything." Zhang Nan said casually.

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

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

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

At this time, the village where smallpox broke out was dead silent, although Zhang Nan knew that there were still people living in this village, but the atmosphere in the village was really not very good.

Sun Simiao was used to such an atmosphere, and just shouted loudly at the entrance of the village: "Everyone, I, Sun Simiao, are back again." This time, the old way has a way to cure this smallpox. ”

Sun Simiao's shout, the villagers heard the voice, like a tide rushed to the entrance of the village, saw Sun Simiao, and all knelt down to kowtow to Sun Simiao, with words in their mouths.