Datang: The prince of salted fish was overheard by Li Er

"Shopping? What are you going to buy?"

That man has also lived in the village for more than three years. In the past, the government sent people to deliver things, but this is the first time he has come to Tianhua Village to buy things.

Li You smiled slightly and said, "I don't know, do you have any cows in your village, preferably cows?"

Although Li You was a psychiatrist and a psychologist, that was his later choice.

After all, he also graduated from a regular medical university, so he still has some knowledge about the smallpox vaccine.

There is no cure for smallpox, but it is preventable.

In view of the feature that smallpox patients can develop lifelong immunity after being cured, as long as a person is exposed to some smallpox viruses that make people feel slightly uncomfortable, then this person can resist smallpox for life after recovery.

This method was thought up by the wise ancestors of the Chinese nation as early as the 16th century.

However, at that time, the ancestors used human pox.

That is, the dry powder prepared from the scabs of smallpox patients is inhaled through the nasal cavity to cause mild infections in normal people, thereby avoiding serious or fatal infections.

However, the smallpox virus obtained from living humans still has great uncertainty, and sometimes it can cause relatively serious adverse reactions and even lead to death.

It was not until 300 years later that people discovered that the vaccinia obtained from cows infected with smallpox recovered from smallpox had fewer adverse reactions after acting on the human body, and it could also complete immunity.

After the discovery of the vaccinia vaccine, humans quickly defeated the smallpox virus.

The smallpox virus also became the first virus to be eradicated by humans.

Now that he knew there was a better way to immunize, Li You naturally asked if there were any cows.

The man was taken aback, but he nodded and asked, "There is one, but there are only three cows in our village. What should we do if we sell them to you?"

Li You was overjoyed. As long as there are cows, his smallpox vaccine plan can be implemented. He immediately said, "This is easy. I will buy your cows, and then I will give you double the cows, okay?"

The man was also honest, nodded and said: "Of course, if you can give us double the cattle, we don't want your money."

"You wait here for a while, I will tell the village head now, and I will bring you the cow in a while."

"But let's say it first, you can't come up, outsiders really can't enter the village."

Seeing Li You nodded solemnly, he turned around and disappeared in front of everyone's eyes.

This made Li You sigh again.

[People in this era are simple and honest, they believe what they say. 】

【This feeling is good. 】

Now that he agreed to that man, Li You naturally would not break his promise, and immediately asked Mou Bin to prepare money and cattle.

When he came to Niu, Li You checked carefully.

After seeing some pustular symptoms on the cow, he nodded with satisfaction and completed the transaction.

That night, Li You planted Datang's first case of cowpox on himself.

The reason why he tried it on himself was also because Li You was not at ease with the cowpox produced by this primitive method.

He felt a little sorry for testing medicine on other people so rashly.

But it's fine to use it on your own.

His body has been strengthened by the system many times, and his indicators are far beyond ordinary people. Even if it is a real human smallpox virus, he has the confidence to fight it.

Not to mention the cowpox, which has been proven to be many times milder.

After that, Li You ordered someone to take care of the cow, and set up many isolation measures to avoid the spread of the virus.

Before the results of the experiment on himself came out, he also isolated himself, living in the carriage every day, and asked Sakura to bring him food every day.

The change of Li You made Sakura very worried.

Especially in the afternoon of the second day, after she found that Li You's body was a little hot, she blamed herself extremely.

She felt that it was because she did not stop Li You that he contracted the disease.

So Sakura decided to stay in the carriage and take care of Li You herself.

This time, Sakura's attitude was very firm, no matter how Li You explained, she refused to go out.

Li You had no choice but to give Xiao Ying a shot.

He didn't know if the virus on his body would be transmitted from person to person. To be on the safe side, Sakura also had to be vaccinated.

Looking at the needle in Li You's hand, Sakura also felt frightened for no reason.

"Miss Sakura, don't be afraid, just bear with it, it won't hurt!"

At this moment, Li You felt as if he was a big bad wolf, while Xiao Ying was a stubborn Little Red Riding Hood.

The result of the inoculation was, of course, that both of them fell ill.

However, the illness only appeared for two days. When the group returned to Chang'an, both of them had fully recovered.

After personally experiencing vaccinia vaccination and carefully observing Sakura's condition, Li You started a small-scale experimental vaccination in Shence Mansion and Prince Chu Mansion.

One is to calculate the incidence of cowpox, and the other is because one cow is really not enough.

Li You went to Hexi for a trip, and when he came back, he concentrated on vaccination at home, and the time soon came to August.

A rare drop in temperature occurred in Kanto and Henan. Many prefectures in Hedong, Hebei, and Henan experienced a sudden drop in temperature. Even Chang'an in the pass dropped a lot.

"Ah!"

Li Shimin just got up, opened the window, and a gust of cold wind hit him.

'Well, I heard that bastard said it would cool down, but it really did. '

'I don't know if that brat is ready. '

'It's been a while since he went to Hexi, why haven't I heard from him recently? Could it be that he hasn't come back yet. '

He turned to look at Li Junxian beside him and asked, "Junxian, has the King of Chu returned from Hexi?"

Li Junxian was taken aback, then nodded and said: "The King of Chu has been back for a few days, but it seems that the King of Chu went to Tianhua Village on the way back, and he stayed in the carriage and never came out."

"Besides, I heard that the girl of the King of Chu entered the carriage to serve, but she never came out after that."

Li Shimin was shocked: "What, there is such a thing!"

"Then how is King Chu doing now?"

Li Junxian said embarrassingly: "Your Majesty, we don't know the news in the Chu Palace. But there is no bad news. I think the Chu King is fine!"

"Li Junxian, when will you learn to fool me!"

"I don't want you to think about such an important matter, I want a definite answer."

"Within the capital, you don't even know the safety of a prince. What use is there for you and Baiqisi!"

This time Li Shimin was really angry, he now valued Li You very much, he felt that Li You was sent by the immortal to protect Datang.

How could something happen to such an important person.

And smallpox is the devil!

The more Li Shimin thought about it, the more anxious he became, and immediately said: "Come on, I want to leave the palace!"