How does rabies virus cause hallucinations, fear of water and irritability?

The following is the reasoning. Rabies virus can infect neurons, because neurons are connected by the nervous system, so the virus can infect the central nervous system (CNS) along the sensory neurons of the wound. Neurons in the central nervous system are very dense, so once infected with the central nervous system 1 ~ 3 days, the whole brain can be infected. The onset of rabies is also in these three days. The explanation of three clinical manifestations during this period: 1, hallucination is the easiest to explain, because the virus infects the nervous system. Because the nervous system is infected, the neurons of memory and perception, including vision and hearing, are infected, necrotic or poorly connected, so hallucinations occur. 2. Rabies virus infects vagus nerve nucleus (regulating viscera, blood vessels and glands), glossopharyngeal nerve nucleus (pharyngeal muscle movement, salivary gland secretion and taste) and sublingual nerve nucleus (lingual muscle movement). These nerve cells control the reflex of breathing and swallowing, so once infected, they will make the respiratory muscles and swallowing muscles spasm. Respiratory muscle spasm can lead to suffocation, accompanied by saliva secretion disorder. Dogs infected with rabies can see saliva coming out of their mouths. (Source, rabies) Swallowing muscles produces spasmodic reaction after swallowing. When people hear or think of water, they will have swallowing reflex and swallowing action. This action can lead to swallowing muscle spasm (fatal in severe cases). So fear of water is actually the result of reflection. Therefore, it is not "afraid of water" but "afraid of throat spasm". 3, fidgety emotional contagion nervous system and various symptoms, will bring considerable pain. People are angry and aggressive when they are in pain. Attacking others, causing others pain, and others attacking others will have a chain reaction. The reason why we don't attack others is because we "tolerate" our anger, which is controlled by reason, and reason is a complex nerve reaction. Once the virus infects neurons, people lose their rationality, and pain directly leads to anger. (For example, children get angry most easily. If they accidentally hurt them, they will tear things, bite people and cry, because children have not yet cultivated rationality. ) because some parts of the nervous system are still working, but the part that regulates its work is damaged. The nervous system has functional areas, and different functional areas have synergistic or inhibitory effects, such as emotional control. Some neurons are responsible for generating anger and staying alert. Some neurons can inhibit this function. Under normal circumstances, the functions of the two functional areas are balanced, and the people we see are emotionally stable. If you are frightened or hurt, the function of the inhibition zone will be weakened, and even if the function of the anger zone is not strengthened, the person will show anger and irritability; When the external stimulus is released, the function of the inhibitory area is restored and the mood is stable. However, if the inhibitory area is damaged, the person will be in a state of persistent irritability, and if the neuron group responsible for generating anger is damaged, the patient will be unconscious or even paralyzed. Other symptoms should be the same. As for why different viruses can cause different symptoms, it depends on many factors. Generally speaking, on the one hand, viruses, on the other hand, nerve cells. In terms of virus, it depends on whether it is equally aggressive in different cells. For example, if replication and transcription are more serious in excitable neurons, it is easy to cause damage to the membrane structure of nerve cells and cell necrosis? ) or is it easier to spread between certain types of cells? Or do you prefer to invade certain types of cells? (more beautiful? ==b) In terms of cells, it depends on whether a certain group of cells are more susceptible. (such as protective barrier, immune cells, being closer to the infected site) How long can you live after infection? Is the function decreased or enhanced after infection? The interaction between the body and the virus determines your symptoms. Once all nerve cells are infected and die, this person is finished. The rabies virus is only a matter of time. The nervous system, especially the central nervous system, is traditionally regarded as an immune isolation area. Without the lymphatic system, immune cells in the blood are not easy to enter (the blood-brain barrier is thick and dense). So generally speaking, infected with this thing can only wait for death.