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The deceased was an adult male of moderate build and normal nutritional status.

The skin was extensively hemorrhaged, ecchymotic, cyanotic, and necrotic, and the corpse appeared purple-black.

Li Ang unloaded another stretcher from the shelf. The second deceased had flea bite marks on his inguinal lymph nodes, armpits, and neck.

Swollen lymph nodes,. Surrounding tissue edema, hyperemia. And there is suppurative ulceration of lymph nodes.

The third deceased had pustules and black scabs on the body surface, surrounded by dark red infiltration, and the base was a hard ulcer, resembling skin anthrax.

the fourth deceased.

fifth deceased.

Li Ang released his thoughts, inspecting and dissecting one corpse after another.

Jia Luo and Ouyang Shi beside him showed more and more dignified expressions.

Even Yan Yundang and the guards of the Yan Mansion, who didn't know much about medicine, could faintly see the problem.

The death of the deceased was too tragic.

Many corpses had lumps the size of apples and eggs on the inner thighs and underarms.

There are dense black spots on the arms and feet,

The skin festered in patches, as if it had collapsed and sunk directly.

No wonder the air conditioner in the cold room had to be turned on so strongly. If the temperature wasn't low enough, a layer of pus from the corpse would have accumulated on the ground.

"It's not like it was put into the cold storage right after death, but it seems to have been placed in the deepest part of the battlefield for several days."

A Yan Mansion guard couldn't help but said softly.

Li Ang glanced at him, didn't say anything, but asked Ouyang Shi to take out the microscope from the medicine box, and he and Qiu Feng took some blood, feces, pus, phlegm and cerebrospinal fluid of the deceased for smears through the power of thought. and perform Gram staining.

The so-called Gram stain is a means of identifying bacteria.

Unstained bacteria are difficult to observe under a microscope because of the small difference in refractive index with the surrounding environment. After staining, you can clearly see the shape, arrangement and joint structure of the bacteria, and then you can classify and identify the bacteria.

The steps of the staining method are as follows. Firstly, fix the smear,

Followed by dyeing with ammonium oxalate crystal violet for one minute,

(Ammonium oxalate is obtained by the action of ammonia water and oxalic acid. A small amount of ammonia gas is prepared by the reaction of ammonium salt and strong base, and then passed into water to obtain ammonia water. Oxalic acid is purified by carbon monoxide and reacted with sodium hydroxide to produce sodium formate, which is then detoxified at high temperature. Hydrogen to generate sodium oxalate. Then lead, acidify, crystallize, dehydrate and other steps to obtain oxalic acid)

Rinse with distilled water, add iodine solution to cover the painted surface and dye for one minute, absorb water with absorbent paper after washing, add alcohol to decolorize, and then use natural dye saffron re-extracted from saffron stigma for a second counterstaining.

After Gram staining, Gram-negative bacteria will appear red, and Gram-positive bacteria will appear purple-blue.

This is mainly due to the difference in cell wall thickness between the two.

The vast majority of pyogenic cocci are Gram-positive bacteria that can produce exotoxins to poison the human body. Escherichia coli, Shigella, Typhoid bacillus, Klebsiella pneumoniae, Bacillus pertussis, etc. are all Gram-negative bacteria.

The penicillin that Li Ang prepared before is a special drug against Gram-positive bacteria, but it is not effective against Gram-negative bacteria.

"Did you see it?"

Looking at Li Ang who was lying in front of the microscope, Qiu Feng couldn't help asking in a low voice.

She had never seen Li Ang so nervous, even terrified.

Even when facing Suzhou water poisoning or cancer, Li Ang has never been so disturbed. He even asked everyone to stand at the entrance of the cold room and not to approach him, leaving him alone to observe the microscope smear.

".Saw it."

Li Ang's voice was undetectable,

Under the microscope, the pink bacilli are densely packed, like capsules, which is shocking.

Worst result.

Yersinia pestis.

Li Ang clenched his fists, changed the smear silently, and continued to observe the samples obtained from pus, sputum, spinal cord, and cerebrospinal fluid.

The result is still Yersinia pestis.

The plague, or the Black Death, is one of the most terrifying infectious diseases in human history.

During the era known as the Middle Ages, it claimed the lives of nearly 50 million people in Europe and as many as 200 million worldwide.

You must know that leprosy, which everyone turns pale upon hearing, can only be classified as a Class C infectious disease.

Schistosomiasis, gonorrhea, pertussis, scarlet fever, meningitis,

Even malaria, tuberculosis, and anthrax can only be listed as Class B infectious diseases.

There are only two Class A infectious diseases that occupy the peak of all infectious diseases.

Cholera, and plague.

If malaria is a demon that has coexisted with humans for countless years and parasitizes the human population,

Then the plague is the incarnation of natural disasters, an efficient sickle for the god of death to harvest the world.

In the different world where Li Ang's memories come from, the plague known as the Black Death suddenly dissipated after killing tens of millions of people,

Nor is it because it is extrajudicial,

But because there is no killing to kill, no slaughter to kill,

In addition, the host of the Black Death, the black mouse, was occupied by the Asian Rattus norvegicus.

(The horned leaf flea on Rattus norvegicus is not interested in humans, and with the disappearance of the black rat, the plague temporarily receded.)

"Rats die in the east, rats die in the west. When a person sees a dead rat, he sees a tiger; within a few days of the rat's death, the death of a man is like dismantling a blockage. When a person dies in the daytime, don't ask the number. The sun is fading and the clouds are protecting you. The three of them walked for less than ten steps. Two people who died suddenly crossed the road. People who died at night did not dare to cry, and the plague ghost exhaled and the lamp turned green."

In a daze, Li Ang seemed to hear a mournful cry from afar.

He exhaled slowly, took out a fire talisman from the talisman plate, and burned all the glass smears.

He turned around, looked at Qiu Feng and the others who didn't know why, and said slowly: "The "Book of the Later Han Dynasty" records that there is a great epidemic in March in the fourth year of Jianning, a great epidemic in the spring of the second year of Xiping, and a major epidemic in the spring of the second year of Guanghe. The great epidemic, the great epidemic in the spring of the fifth year of Guanghe, the great epidemic in the spring of the second year of Zhongping."

Everyone's expression changed in unison,

What Li Ang was talking about was the great plague that occurred in the late Eastern Han Dynasty. During the 21 years of Emperor Han Ling's reign, five major plagues broke out, directly breaking through the Han Dynasty's ability to withstand, leading to frequent peasant uprisings, and finally adding the last straw to the demise of the Han Dynasty.

According to rough statistics, if we add the ongoing plague during the Cao Wei period,

A spate of plagues (likely flu) killed more than half the population, numbering in the tens of millions.

So much so that when it is mentioned now, Yan Yundang, Qiu Feng and others still feel the coldness that penetrates into the bone marrow.

"Is it really that bad?!"

Yan Yundang asked in a deep voice, he is an old soldier who has lived from the time of the Holy Queen to the present, and has seen many plagues in various places. It's hard to imagine, what could be more desperate than ten rooms and seven empties.

"Multiply the scariest plague you've ever seen by ten or a hundred times, and it's almost equivalent to the current plague."

Li Ang climbed up the frosty steps of the cold room step by step, and said slowly: "Get ready, the plague is coming."