Ask Sword

The fleet loaded with relief supplies, along the canal water system, finally arrived in Suzhou City.

When Qiu Feng saw Li Ang again, he was startled by the blood in Li Ang's eyes, "Risheng, are you okay?"

"Fortunately, it's just that I feel less recently."

Li Ang forced a smile. These days he lived in the ward and only slept three or four hours a day. While treating the most serious schistosomiasis patients with Niansi, he was looking for ways to curb the water poisoning epidemic.

"follow me."

He turned around and signaled the Chang'an visitors to follow, Qiu Feng and the others looked at each other, followed Li Ang silently, walked through the courtyard of the ward, and came to a room.

The room was full of information and documents. Li Ang cleared the seats for everyone with his thoughts, took a break with tea in his hands, and said slowly: "I have found out the transmission route of schistosomiasis."

"Um?!"

The Chief Physician of the Imperial Medical Office, Qiu Jing, was both surprised and delighted, "What is it?!"

Li Ang raised his palm, released his thoughts, and separated the papers on the table to the sides, revealing the bottles and cans hidden underneath.

"The samples contained in these five bottles are all schistosomes.

In other words, the five life stages of schistosomiasis.

Adults, eggs, miracidia, cercariae, juvenile worms. "

Li Ang pointed to the glass bottle and said, "Similar to turning from a cocoon to a butterfly, schistosomes also have different appearance and behavior characteristics at different stages of life.

The schistosome in the cercariae stage will use the puncture thread on the body to penetrate into the skin of the host, remove the tail, and become a juvenile worm.

The schistosomes in the juvenile stage will enter the bloodstream, move to the intestines and blood vessels of the host body, and then develop into adults.

In the adult stage, schistosomiasis will reproduce and lay eggs, laying nearly a thousand eggs every day.

Some of the eggs deposited in the host body can cause symptoms such as ascites, jaundice, and giant spleen. Tortures the host, weakening it. "

He stood up, walked to the side room, and brought two iron brackets over.

On the bracket, there are two headless corpses of rabbits, both of which have been disembowelled, and their fur is fixed by hooks, exposing the internal organs.

Qiu Feng frowned slightly and said, "This is."

"Two rabbits, one infected with schistosomiasis and one not. See the difference."

Li Ang put the bracket on the table, Qiu Feng and others observed it for a while, and said uncertainly: "This one's intestines should be whiter? The liver is also full of white spots."

"That's right."

Li Ang nodded, and pulled up the rabbit mesentery with his thoughts, so that Qiu Feng and others could observe better, "The entangled ones in the blood vessels are schistosomes."

"so much?!"

Qiu Feng felt his scalp numb, and the rabbit's blood vessels were densely covered with white lines, which made people feel uncomfortable just by looking at them.

"Yes. As for the white spots on the liver, they are the eggs of schistosomes."

Li Ang said lightly: "This is just a small rabbit. Huge humans and cattle are more severely infested by schistosomes."

"."

Everyone in Chang'an was speechless. On the way they came by boat, they saw many patients with swollen abdomens, so that the folks began to have a proverb to describe patients with schistosomiasis——

His stomach was swollen like a wax gourd, his face was yellow like a cucumber, and his hands and feet were as thin as a loofah.

Li Ang continued: "The other part of the eggs produced by the schistosomiasis in the host body will be excreted along with the feces.

And this is also the main way of transmission of schistosomiasis. "

Light King Li Shan was slightly taken aback, "Poop?"

"Didn't expect it. The final form of grains is the beginning of the end of human life."

Li Ang pointed to the bottle containing the eggs, and said: "After the feces flow into the water, the miracidia in the eggs hatch out, penetrate into the body of the intermediate host, reproduce in the body of the intermediate host, and become cercariae.

The cercariae swim in the water again, look for hosts, carry out parasitism, and complete the cycle.

And this intermediate host is a snail.

To be precise, it is a specific snail. "

With a wave of Li Ang's palm, the box in the corner opened, and several glass jars floated out of it.

It is full of small objects like rice grains. You have to pour them on the table and observe carefully to see that they are snails with sharp ends.

Li Ang said: "I asked Shen Tu to enshrine, and with the observation ability of a cultivator in the Candle Sky Realm, I observed in the plague water for a long time before I finally confirmed it.

The cercariae in plagued water escape from the body of this tiny snail.

Only after following the vines did we figure out the entire life cycle of the schistosomiasis. "

"Just a small contribution."

Shen Tuyu waved his hand and said: "After repeated experiments, we found that

The miracidia of schistosomes are too fragile to parasitize larger snails or humans.

It can only parasitize this tiny snail, which is slightly larger than a grain of rice, and develops inside the snail. "

"And because snails like to live in grass in wet areas,

River courses, rice fields, irrigation ditches.

Suzhou has a well-developed water system. As long as there is water, there may be snails, and it may become plagued water. "

Li Ang said: "People want to go to the rice fields to farm and fish in the lake, so they will inevitably come into contact with the current, and they are always at risk of being parasitized.

Spring plowing will begin in February and March.

What we can do now is to kill the snails as much as possible before spring plowing. And then kill schistosomiasis.

Here are some of my suggestions. "

He picked up a stack of documents from the table and handed it to Li Shan.

Li Shan took the document and read it carefully, "Drug kill?"

"That's right."

Li Ang took a deep breath, "After the tea oil is squeezed out, the remaining residue is pressed into cakes, and such tea cakes are also called Chaku in Lingnan Road.

The tea extract is poisonous, and fishermen in Weizhou use it to poison fish, and the poisoned fish is harmless to humans.

What's more, tea dry extract can also kill snails, and the killing efficiency is about 30%. "

Li Shan didn't ask such stupid words as "how can it be 30%", just looking at the densely packed forms, data, experiment logs, and plan demonstration process on the paper is enough to prove that this is the most suitable drug at this stage.

Li Shan said: "Okay. I will go to discuss with the prefect immediately, and collect tea cakes from surrounding states and counties."

"Um."

Li Ang nodded and said: "In addition to killing with drugs, the more important thing is to change the environment. The snails move slowly, and they will die in pieces if they are buried in the soil.

Considering that they often live in irrigation ditches, people can be called in to fill up old ditches and build new ones. Bury the snails in the soil.

Secondly, you can also cut off the reeds and turf that are easy to breed snails;

Burn the reeds around the water system of Taihu Lake with fire;

Build dams to enclose new arable land to prevent the spread of snails;

In addition, feces must be managed-patients parasitized by schistosomiasis, with a large number of eggs in the feces,

When feces enter the water, they will pollute the water body.

On the one hand, I suggest that ceramic workshops produce as many pottery pipes and porcelain pipes as possible, splice them together, and bury them underground to form a sewer system like the one in Chang'an City.

On the other hand, public toilets and septic tanks are built in cities and suburban towns. Private dumping of feces is strictly prohibited, and the feces are treated centrally to prevent insect eggs from entering the water source.

At the same time, many people take water from the river and wash their clothes by the river, which is too easy to be infected and parasitized.

A large number of wells need to be built.

Finally, spring plowing is just around the corner, and it is inevitable for the common people to go into the water for activities.

It is necessary to use a large amount of quicklime, rosin, pure wine, etc. for disinfection.

Distribute cloth leggings, oiled socks, etc. to the peasants."

The more Li Ang said, the more frightened Qiu Jing and the others became.

On the one hand, they admired Li Ang's outstanding ability and orderliness,

On the one hand, he estimated the magnitude of the project in his heart.

For a single item, at least 200,000 manpower must be mobilized to dig and fill ditches.

plus burning reeds,

Build dams, wells, public toilets, sewers,

Handing out socks, etc.,

The manpower, material resources, and financial resources to be mobilized are simply unimaginable.

"good."

Unexpectedly, Li Shan nodded and agreed after only thinking about the calculation.

Seemingly noticing the astonished gazes of other people, Li Shan explained: "People from Luli Academy will also come to help."

I see.

Everyone suddenly realized,

Local businesses, rich households, civilian husbands, officers and soldiers of the imperial court, plus monks supported by the Academy and Luli Academy. That does have the possibility of realizing the plan.

One monk is worth fifty peasants,

But fifty civilian husbands may not be able to replace monks.

For a moment, everyone was excited,

Li Shan chatted with Suzhou Sima for a while, and immediately went to the prefect's mansion to discuss a plan with the Suzhou prefect - he was originally the King of Light, with higher authority.

Physicians such as Qiu Jing and Qiu Quan received the list of past medicines given by the staff of the local ward, and discussed which medicines to use.

Only Qiu Feng noticed the fleeting and deep fatigue in the depths of Li Ang's eyes,

and sorrow.