Wild nights are always unsettling.

It has nothing to do with the freezing temperature, and it has nothing to do with the snakes, insects, rats and ants that people can't guard against, but after the cold wind blows, the sound of leaves always seems to hide some greater crisis.

Eight adults dressed in dusty cotton and linen coats were sitting around a large campfire, their bodies stained with blood and dust that they had not had time to deal with, only the exposed skin had been roughly washed, and each of them had tiredness written on their faces.

The occasional conversation is already their most relaxing moment.

Dongzhi was squatting beside Zhan Changran, scooping up the sterilized needle from the boiling water, and pulling the short arm of the sleeping child in the man's arms.

Dongzhi is not a pediatrician, she is good at dealing with mechanical injuries and detection and analysis. Although she could tell what was causing the child's discomfort, she could only do some adjunctive treatment.

Low immunity is a problem that Yiyue has always had to face, and her own ability has barely made up for this deficiency in the past, but one day, when the problem is beyond the scope of her ability to deal with it, the problem that has been ignored will cause serious consequences.

The immune system is the most important line of defense in the human body, and it has been in constant game with trillions of microbes in the environment in the evolution of tens of millions of years.

The weak die, the strong live.

Newborns' immune systems are very weak, and most of the babies who are young and fragile have their mother's initial immunity, which obtains antibodies from breast milk to fight against the outside world.

In addition, babies and young children who do not have mothers to protect themselves from a world full of invisible dangers can also obtain better immunity against the microbes in another way: vaccination.

These de-virulent vaccines are able to elicit a response from the autoimmune system, preserve the memory of the elimination of a specific strain, and respond quickly the next time they are attacked by the same pathogen, producing soldiers who can destroy the enemy and maintain the homeostasis of the human body.

If you are already infected and don't have enough time for your body to react, then antibodies are needed to kill the virus directly.

The existing equipment does not allow Dongzhi to prepare vaccines in the wilderness, nor does she allow her to make antibodies, and it is already the limit to be able to isolate the virus strain in the baby's body.

The little man fell asleep in his broad embrace, his cheeks flushed abnormally, and the blisters on the back of his exposed hands, face, and neck still had freshly faded marks.

Her hand was loosely resting on the captain's arm, and there was an indwelling needle on her delicate wrist, and while the needle was on Zhan Changran's wrist, the blood-red liquid flowed out of his body, and after passing through the three-inch miniature bioseparator, part of the yellow serum and red plasma were isolated, and the pale yellow liquid slowly flowed into the child's body along the short pipe, and the red liquid flowed back into Zhan Changran's body.

Not long ago, she cried for a while, drank a little milk through her eating instinct, and vomited most of it because she was unwell.

Since she can't swallow large pieces, anti-inflammatory drugs and antibacterial agents have also been carefully calculated, and the amount of milk mixed with no more than the burden on the child's internal organs is used to let her drink, but the effect is not good.

Fortunately, the human body is an incomparably sophisticated factory, the child's blood type is not special, and there are adults who are willing to pay for her.

Adults with vigorous metabolism are infected with the virus, and the strong immune system can release the corresponding immune factors to synthesize antibodies in less than half a day, and then filter it a little to use it as a crude biological agent.