Transmigrated into a female county magistrate during a famine, leading her country to prosperity

"Look at this..." Shen Zheng came forward and seemed to be talking about Li Shiyuan, "Uncle, Doctor Li's family used to be very wealthy, so it's normal for them to have secrets. We don't need to dig into the details."

Yu Shizhang lowered his head and flipped through the book, looking for the page he had just read.

"Well, everyone has secrets in life. Whether it's me, Yu Shizhang, or you, Shen Zheng. As long as our hearts are together, it's all."

He looked up at Shen Zheng, his eyes full of trust, "You are right, there is no need to dig into some things, Ben Bo... trust Doctor Li."

Ben, I believe you.

Shen Zheng looked at his graying hair and realized that she was no longer afraid of the Yu family discovering her secret without realizing it.

Although she could never say it out loud, it was enough that they understood it tacitly.

They would not harm her and would even cover up for her.

Shen Zheng thought, maybe family...is just like this?

After Yu Shizhang finished speaking, he began to carefully study the methods of preventing and treating smallpox. Li Shiyuan wiped his sweat and gave Shen Zheng a look that said "that was a close call".

"How is it, Doctor Li?" Shen Zheng asked him, "Based on your experience, which epidemic is most likely to break out in the east right now?"

Li Shiyuan took out a pen and paper and said thoughtfully, "I have thought about it. The climate in the east is hotter. Even though it is autumn now, it is still hotter than here. Therefore, some diseases can easily subside."

He raised his hands and rolled up his sleeves, and began to write the names of diseases and their symptoms. "Taking into account the regional and flood disasters, the number of diseases that are difficult to prevent and control and highly contagious can actually be counted on one hand."

"That's great!" Shen Zheng breathed a sigh of relief. "Then please list these diseases first. I and the uncle won't bother you."

At Shen Zheng's request, Li Shiyuan wrote in great detail the symptoms of each epidemic, the cause of the disease, the mode of transmission, prevention and control, as well as the required prescriptions.

Just one epidemic alone took up several pages of space.

Seeing that he still had something to write, Shen Zheng moved closer to Yu Shizhang.

Yu Shizhang maintained this posture for a long time, and Shen Zheng didn't know what he saw.

"Cowpox..." Yu Shizhang murmured.

"Cowpox?" Shen Zheng looked at the page of the book, on which were written four big words: "Smallpox Prevention".

She came over to block the sunlight on the pages of the book. Yu Shizhang was silent for a moment and then asked her, "Cowpox, a poison from cows, can it be used by humans?"

The reason he asked this was because he was already sure that Shen Zheng knew the answer.

"It works." Shen Zheng no longer hesitated to hide.

"When a cow is infected with smallpox, it will develop cowpox. But if we really talk about it, cowpox and the pox that infects humans are not the same, but they are roughly similar. The toxicity of cowpox is also weaker than that of human pox. So when the cowpox is punctured, the pox fluid is taken out, and then inoculated into a human, the human will be infected with a mild case of smallpox that is not fatal and can be cured."

"A mild case of smallpox?"

Yu Shizhang didn't understand, "Then why can this prevent and treat smallpox?"

Shen Zheng took the medical book and explained to him using the words on it: "It says here that a person can only be infected with smallpox once in his life. Once you have been infected and recovered, you will not be infected again in the future."

Shen Zheng blinked at him and said, "Uncle, mild smallpox is still smallpox."

“It’s still possible!”

Yu Shizhang was stunned, "If that's the case, then as long as everyone in our Great Zhou gets vaccinated, we won't have to worry about smallpox anymore?"

Shen Zheng thought back to her past life. In fact, by the time she was in college, vaccines were already widely available, so newborn babies were no longer often vaccinated.

"You can say that." She nodded. "The more people are vaccinated, the less contagious smallpox will be, until it disappears. When vaccination is fully popularized, it won't really matter whether or not you get vaccinated."

As Li Shiyuan listened, he could no longer concentrate on writing. What they said was a fatal attraction to him.

He put down the pen and paper in his hand and tried to join the conversation.

"My Lords, I have heard of the method of 'vaccination' before."

Yu Shizhang looked over in surprise, "Really?"

If vaccination had existed before, why had he never heard of it? Why was the death rate so high during the smallpox epidemic?

"Really." Li Shiyuan recalled for a moment, "But it's not 'cowpox', and the effect is not great. It can also easily cause death. The cost outweighs the gain, so this method was hidden."

Yu Shizhang frowned and was about to say something, but was interrupted by Shen Zheng: "Doctor Li, please write it down first. We will discuss the vaccination later. What you have in your hand now is a matter of life and death."

"oh oh!"

Li Shiyuan suddenly came to his senses and said, "My Lords, I will go to my room to write. I will come out after I finish writing."

If he stayed here any longer and listened to them talking, he might not be able to write a single word!

After Li Shiyuan left, Shen Zheng no longer had the heart to read medical books.

To prevent and control epidemic diseases, we certainly need more than just prescriptions and treatments. “Prevention, treatment, and cure” must include both prevention and treatment in order to achieve the best of both worlds.

The methods to control the spread of the disease should also be written down!

She went to the front hall to get paper and pen, and began to write down the methods she had discussed with Yu Shizhang last time.

"Do you really want to cremate me?" Yu Shizhang looked over at some point.

"If it's serious." Shen Zheng didn't make a direct statement. "I respect customs, but if the diseased corpses spread quickly and cannot be controlled, cremation is the only hope for survival."

Yu Shizhang didn't say anything. Shen Zheng pursed her lips and said, "That's it. The villain... needs to be dealt with by Master Yu."

"Public opinion is terrible." Yu Shizhang said after a silence, "No matter who takes the lead in this matter, even if the effect is significant at that time, it can also become a reason for him to be slandered."

Shen Zheng also thought of what he said.

Can......

She couldn't let Yu Jiusi ignore the people, nor could she ignore Yu Jiusi.

This is the classic train conundrum - the train is out of control, there's one person on one track and a hundred people on the other, who do you choose to kill?

Shen Zheng chose to silently write down the disadvantages of the two options in the letter. She could choose either side regardless of the consequences, but Yu Jiusi was not her.

Yu Jiusi is also a living person and he has the right to make his own choices.

"Jiusi's thoughts will be the same as yours." Yu Shizhang spoke. He understood his grandson.

Shen Zheng stopped talking and continued writing in silence.

On the last piece of paper, she wrote down the calcination method, usage and precautions of limestone.

Liang Fu said that limestone was more common in the Great Zhou Dynasty. In her memory, the eastern part was also a stone mining area in her previous life. She hoped that the history could overlap.

"So be it."

Shen Zheng put down his pen and blew the ink dry.