Yu Kai and Niuniu hugged each other and cried, and everyone in the lab cheered. However, they all knew that this was just the beginning of success, and many severe challenges awaited them.
An experienced researcher said solemnly, "Although the mutant dog's condition has improved, we still need to conduct more tests and observations to ensure the stability and safety of the vaccine."
Yu Kai nodded vigorously, his eyes as firm as iron: "No problem, as long as we can save Earth, no matter how many experiments are required, I will fully cooperate."
In the following days, Yu Kai frequently cooperated with researchers in blood draws and tests. His body gradually became weak due to the frequent blood draws, and his originally rosy face gradually lost its color, but he had no complaints.
Niuniu saw it all, and it hurt her heart. She meticulously prepared nutritious meals for her brother every day, each one filled with love and care, hoping to help him recover quickly. However, Yu Kai's condition continued to deteriorate, his once robust frame becoming increasingly frail, and the brilliance in his eyes dimmed.
After rounds of trials, the vaccine's effectiveness became increasingly stable, and the research team eventually decided to mass-produce it.
This news spread throughout Earth. The long-awaited good news had finally arrived, and people were filled with joy. They hugged each other, wept tears of joy, and looked forward to the future with hope. Their laughter and tears mingled, blossoming into a flower of hope on this ravaged land.
With the large-scale production of vaccines, the blood supply provided by Yu Kai could no longer meet the Institute's needs. Furthermore, the frequent and extensive blood draws during this period had caused Yu Kai's health to deteriorate. His face was as pale as paper, and his figure was becoming increasingly emaciated, as if a gentle breeze could blow him down. If the blood draws continued, it would be life-threatening.
The researchers were extremely anxious. On the one hand, they were faced with the urgent need to save Earth, and on the other hand, they were faced with Yu Kai's physical condition. During this period, they tried to replicate and optimize the blood through gene editing technology to cultivate the same blood, so as to reduce their dependence on Yu Kai's blood.
However, gene editing is an extremely complex and immature technology, and the results of the cultured blood were not ideal. In the laboratory, the lights of the instruments flickered, just like the researchers' anxious hearts.
Niuniu was even more worried. She stayed by Yu Kai's side day and night, tears streaming down her face as she watched her brother frail. "I can't go on like this. I won't be able to hold on." Her voice was filled with tears and deep fear, as if her heart was about to break. Every tear she shed was filled with endless worry for her brother.
Yu Kai forced himself to smile, and comforted his sister and those around him: "Don't worry, I can still hold on. As long as we can save the Earth, this little sacrifice is nothing." But the fatigue and weakness in his eyes could not be concealed. The deep dark circles and chapped lips all showed his extreme weakness, like a mountain about to collapse.
"I'm going to hunt mutant zombies and use the mutant beads to replenish your energy!" Niuniu clenched her fists and stood up resolutely, her eyes burning with determination. Her clenched fists seemed to contain infinite power.
"I'm going too. The young master must not be in any danger!" Wu Xiaohu lowered his hand from stroking his hair and drew his broadsword from within his body. The sword gleamed coldly under the light, demonstrating his determination. The cold light reflected on his resolute face, revealing a fearless aura.
"No, I said no." Yu Kai said anxiously: "Now that the vaccine has been successful, everyone has a chance to recover. We must never kill innocent people again!" Although his voice was weak, it was full of determination, and every word was like a firm nail.
"I'll go find the mutant golden eagle, the sea dragon, and Tian Lin. In short, I can't let anything happen to you!" Niu Niu said with her back to Yu Kai, and then looked at Wu Xiaohu, "You help me watch over big brother, and don't let him ask the nurse to draw blood again!" Her tone was unquestionable, with a resolute momentum.
"Ah!" Wu Xiaohu was stunned. He looked at Yu Kai who wanted to get up, then looked at Niu Niu with a determined look, and said worriedly: "You must be careful! Nothing must happen to you!" His face was full of anxiety.
"Don't worry, I won't die for my brother!" After Niu Niu said that, her figure disappeared in an instant, leaving only a breeze.
"Niuniu! Little sister!" Yu Kai was extremely anxious and said weakly to Wu Xiaohu, "Follow her quickly. Don't let anything happen to her!" His voice was anxious and worried.
"Young Master, then...you!" Wu Xiaohu hesitated a little, his eyes moving back and forth in the direction where Yu Kai and Niu Niu left, full of entanglement.
"Don't worry, I won't let them beat me again. I want to keep my life to find my mother, Sister Yuening and the others!" There was a determined light in Yu Kai's eyes, and that light seemed like a beacon in the darkness, illuminating his way forward.
"Oh!" Wu Xiaohu touched his sparse hair, "Then I'll leave, young master." Seeing Yu Kai nod, he chased out with a big knife, and his figure quickly disappeared outside the door.
After Wu Xiaohu chased him out, Yu Kai lay alone on his hospital bed, his mind racing, constantly pondering solutions. His brain was working rapidly, and each idea was like a shooting star, streaking through the darkness and disappearing in an instant.
Elsewhere, Wu Xiaohu, with the help of Chao Lao and the others, finally found Niuniu. She was being attacked by a pack of ferocious, mutated golden eagles. Niuniu wielded her claws, desperately resisting, nimbly weaving through the swarm, searching for a chance to break through. Every leap, every attack, was filled with strength and courage.
After a fierce struggle, and with Wu Xiaohu acting as bait to attract the eagles' attention, they finally escaped the flock. But before Wu Xiaohu could even catch his breath, Niuniu handed him a large mutant bead and said, "Brother Xiaohu, take it back. The mutant golden eagles are starting to gather. They'll be harder to kill later. I'll go back and see if I have another chance!" Without waiting for Wu Xiaohu's response, she turned and headed back. Completely ignoring the drain on her spiritual energy, her figure appeared remarkably resolute in the setting sun.
Seeing this, Wu Xiaohu immediately stood up and shouted, "I'll go with you!" His voice echoed in the empty wilderness.
"No need, you should send brother back quickly and keep an eye on him. Don't let him ask the nurse to draw blood again!" Niu Niu's voice came from afar, with an irrefutable determination.
"Okay!" Wu Xiaohu made up his mind and dragged his tired body back quickly.
However, Yu Kai was too weak to pass out. Academician Chao and others stood by anxiously, their faces filled with worry and tension.
Wu Xiaohu quickly returned to the base and hurriedly took out the mutation beads given by Niuniu to help Yu Kai absorb them. He was extremely anxious and urged the doctor to find a solution quickly. His voice became hoarse with nervousness, and beads of sweat continued to roll down his forehead.
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