With Xue Ye providing cover, Liu Yingying found it much easier to get things done, and her efficiency improved significantly.

First, all the patients in the hospital were given medication, and then some of them were vaccinated.

At first, the imperial physicians had a lot of doubts about her.

But after observing for a day, when they saw that the patients who had taken the medicine and received the vaccine were indeed improving with visible results, they were finally convinced!

For a time, Liu Yingying was treated as an honored guest!

Taking advantage of the situation, Liu Yingying made a request: "If you want to end this plague as soon as possible, quickly prepare a room for me. I need it to prepare medicine!"

How could the imperial physicians refuse?

The news that the quarantine site had cured several smallpox patients quickly reached the ears of the magistrate of Jinling City and General Weiyuan.

General Weiyuan waved his hand and assigned the study of the original owner of the quarantine site to Liu Yingying, who could use it as she pleased.

The doors and windows of the study were closed at the time.

Xue Ye clasped his hands together, leaned back against the door frame, and watched her fiddling with the pile of bottles and jars, then raised his own questions;

"Don't you have medicine that can cure those patients directly? Why go through all this trouble?"

Liu Yingying glanced at him, sighed helplessly, and explained, "You're right, I can indeed use those things to save people, but if I do that, my secret will be easily leaked."

So for safety's sake, she had no choice but to go through all this trouble...

"So what are you doing now?" Xue Ye asked, puzzled.

Liu Yingying explained, "I just collected smallpox vaccine samples from those patients outside. Now, as long as we can extract a useful vaccine from these smallpox vaccines, we can immediately vaccinate everyone."

Xue Ye frowned slightly; "But is doing this...safe?"

Liu Yingying shook her head; "I'm not sure either."

After all, she didn't study medicine or biology.

"However, as long as these smallpox vaccines don't endanger the patients' lives, it's fine. If the vaccines really don't work, I'll use that as a cover to give them my medicine, and I can still cure them!"

Xue Ye then realized that she had made preparations for both possibilities!

Liu Yingying locked herself in her study to study vaccines, while the imperial physicians waited outside.

She would occasionally try to peek through the crack in the door, but Xue Ye would always catch her.

The result was either pebbles being thrown through the crack in the door and hitting the imperial physicians on the forehead, or a writing brush being thrown out of the window and poking them in the face…

After this happened several times, the imperial physicians no longer dared to approach and spy.

Liu Yingying had no choice; it wasn't that she was narrow-minded or unwilling to pass on her medical skills.

Rather, it's because the things she knows are truly unknown to outsiders!

Three days and three nights passed, just when the imperial physicians outside had given up hope.

Suddenly, a clear, surprised cry came from the study: "I did it! I succeeded!"

"It really worked?" The imperial physicians immediately perked up and exchanged glances.

The next second, the study door opened, and the woman who was originally beautiful now looked pale and haggard.

She was clearly tired.

She held a transparent jar in her hands and handed it to the doctors, saying, "This is the vaccine I developed. You can use it on people whose conditions are not so severe."

"Then observe them overnight. If there are no adverse reactions and their condition improves, we can proceed with the vaccination of all patients!"

To ensure they could learn, Liu Yingying even had several patients brought in.

In front of the imperial physicians, a cross was made on their bodies, and then smallpox vaccine was placed inside.

The day after the smallpox vaccination, patients with milder symptoms showed significant improvement.

Even the most seriously ill patients no longer have a fever.

Because of the vaccine's success, the medicines that Liu Yingying had prepared were hardly needed.

However, even after vaccination, the most severe cases did not show significant improvement.

There are about four or five hundred more critically ill patients, but the officials in Nanjing are already quite satisfied with this number.

The torrential rains of the past few days have stopped, the floodwaters are slowly receding, and the epidemic has been brought under control.

Even if all four or five hundred people die from the disease in the end, it won't have a big impact on them.

On the contrary, they controlled the disaster and the epidemic very well in the face of this disaster, and will be rewarded by the imperial court!

As the imperial physicians gradually returned to the capital in batches, Liu Yingying remained extremely busy.

All patients in the city have been vaccinated, and even those who were seriously ill are gradually recovering.

Now she has turned her attention to the refugees outside the city.

Those hundreds of critically ill patients were as if they had been abandoned, confined to a fixed place and unable to leave.

The government would distribute a bowl of thin porridge to them every day, but those seriously ill patients had already reached the point where they hadn't eaten or drunk anything.

When Liu Yingying found that the vaccine she developed was ineffective for them, she directly used the medicine from the mall.

With the help of a host of advanced medicines from later generations, these people's conditions began to gradually improve.

This news naturally reached the ears of the prefect of Jinling City and the General Weiyuan very quickly.

Outside the city, in a refugee camp, Xiaoxue handed over a wrung-out handkerchief. "Sister Liu, quickly wipe your face and rest for a while."

Xue Ye also said with concern, "You and Xiaoxue go back to the inn in the city to rest. I'll keep an eye on things here, nothing will happen!"

Liu Yingying sat down on a rock, wiped the dirt off her face with a handkerchief, and said firmly, "No, I can hold on a little longer. Actually, I also want to know why the vaccines developed are not working for these critically ill patients..."

"I can still do some research while I still can, otherwise where will I find people to be guinea pigs for my experiments once they've all recovered?"

Cases of large-scale smallpox outbreaks like this are not uncommon in this era.

This time, with her intervention, these people were spared from widespread bloodshed.

But if this plague were to break out in a place beyond her reach, wouldn't those people be left with no choice but to wait to die?

Although Liu Yingying's main profession is not as a doctor, after experiencing this plague, she also wanted to do something for the people.

We will perfect the smallpox vaccine and make it widely available, so that no one will ever lose their life to smallpox again!

Xue Ye, Xiao Xue stopped trying to persuade her and instead did what she could to help him share the burden...

Persistence pays off. Three days later, she finally discovered the secret of the smallpox vaccine and successfully improved it.

"I did it! I did it!"

"Xiaoye, Xiaoxue, I did it!"

Liu Yingying happily held the glass bottle in her hand, while tightly gripping Xue Ye's arm with one hand.

But looking at her increasingly haggard face, Xue Ye couldn't help but feel a pang of heartache. "But you should go and rest!"