Chapter 248 Molluscicide
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 taken aback by the bloodshot eyes in Li Ang's eyes, "Risheng, are you okay?"
"Fortunately, it's just that I feel less sleep 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 Changan 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 a cup of tea, and said slowly: "I have found out the transmission route of schistosomiasis."
"Um?!"
Qiu Jing, the chief physician of the Imperial Medical Bureau, was surprised and delighted, "What is it?!"
Li Ang raised his palm, released his thoughts, and separated the paper on the table to the two sides, revealing the bottles and cans hidden underneath.
"The samples contained in these five bottles are all schistosomes.
Or, the five stages of life of schistosomiasis.
Adults, eggs, miracidia, cercariae, juvenile worms. "
Li Ang pointed to the glass bottle and said, "Similar to turning from a cocoon into 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 child worm.
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.
A part of the eggs deposited in the host body will 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."
"Exactly."
Li Ang nodded, and pulled up the rabbit mesentery with his thoughts, so that Qiu Feng and others could observe better, "What is entangled in the blood vessels is the schistosomiasis."
"so much?!"
Qiu Feng only felt his scalp numb, and the rabbit's blood vessels were densely packed with white lines, which made people feel uncomfortable just by looking at it.
"Yes. As for the white spots on the liver, they are schistosome eggs."
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——
My stomach is swollen like a wax gourd, my face is yellow like a cucumber, and my hands and feet are as thin as a loofah.
Li Ang continued: "The schistosomiasis is in the host body, and another part of the eggs produced 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 whole 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, looking for hosts, parasitizing and completing 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 from 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 Shentu 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.
Following the vines, I figured out the entire life cycle of schistosomiasis. "
"Just a small contribution."
Shen Tuyu waved his hand and said: "After repeated experiments, we found that
The miracidia of schistosomiasis 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. "
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: "The common 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 always risk 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?"
"Exactly."
Li Ang took a deep breath, "After the tea oil is squeezed out, the remaining residue is pressed into cakes. Such tea cakes are also called Chaku in Lingnan Road.
Chaku leaching solution is toxic, and fishermen in Weizhou use it to poison fish, and the poisoned fish is harmless to humans.
In addition, the extract of tea leaves can also kill oncomelania, and the killing efficiency is about 30%. "
Li Shan didn't ask such stupid words as "how to get 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, manpower can be called 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 cultivated land to prevent the spread of oncomelania;
In addition, feces must be managed—patients parasitized by schistosomiasis, with a large number of eggs in the feces,
After feces enter the water, they will pollute the water body.
I suggest that on the one hand, the ceramic workshop should produce as many pottery 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 get water from the river and wash their clothes by the river, which is too easy to be infected and parasitized.
Need to build a lot of wells.
Finally, spring plowing is coming soon, and it is inevitable that people will go into the water for activities.
Need to use a lot of quicklime, rosin, pure wine, etc. for disinfection,
Distribute cloth leggings, oiled socks, etc. to farmers.”
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 and more,
The manpower, material resources, and financial resources to be mobilized are simply unimaginable.
"good."
Never thought about it, 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, wealthy 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 civilian husbands,
But fifty civilians may not be able to replace monks.
For a while, everyone was excited,
Li Shan chatted with Suzhou Sima for a while, and immediately went to the Taishou Mansion to discuss a plan with the Suzhou Taishou—he was originally the King of Light, with higher authority.
Physicians such as Qiu Jing, Qiu Quan, etc. 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 deep in Li Ang's eyes,
and sorrow.
(end of this chapter)