Bats can carry viruses but do not cause disease, and these viruses can be transmitted from generation to generation, which is somewhat similar to waterfowl organisms in nature that carry influenza a viruses but are usually not. But why would the “receivables” in this “natural virus bank” infect humans and make us sick
To answer this question, it is important first to know clearly how complex the transmission of the virus is, which is related to the ecological chain of the virus, that is, the transition from a natural storage host to an intermediate host, to an eventual sensory host, and only after the completion of this set of procedures will it be possible to prepare for further attacks on a vulnerable host. In addition, there is a need to know how diverse the ecological environment is, such as the different host capacities for the influenza virus, and finally to understand the genetic interrelationship between the infected host and the natural host and to recognize the genetic differences between the two。
Ebola virus patient
Take the example of sars virus infection that erupted in parts of the country in 2002. In the early stages of sars, researchers found virus-infected fruit beavers at the southern animal market, and therefore considered the fruit beavers to be the natural host of the sars virus, but have not since continued to be found with the virus. Subsequently, professor yuan guoyong of the university of hong kong and others found in a field survey in hong kong special administrative region of china that the local wild rudd daisies had a coronary virus that was very similar to that of the fruit beaver sar and named it “bat sar”. I'm not sure i'm the only one who's going to live with the virus. The findings of the research institute of the chinese academy of sciences, in collaboration with australian and american scientists, provide further support for these speculations. As a result, the joint study group concentrated sars virus tracers on bats. Starting in march 2004, extensive surveys of wild bats by scientists from china, australia and the united states resulted in the discovery of sars virus antibodies and genes in four species of daisy bats, of which diaphragms showed more than 70 per cent positive。
As a result, wild bats may be the source of sars, while fruit beavers are the intermediate transit host, and we humans, as last-resort hosts, end up being the target of sars because of, for example, inappropriate eating habits. How complex the process of transmission is, we almost “mistake” the fruit beaver, which was also a victim. It's just that the genetic differences between humans and fruit beavers put us at different levels of susceptibility。
Ebola virus patient
On the other hand, the genetic sequence analysis shows that bat-type sars virus and human sars virus genome sequences are 92 per cent homogenous, but the difference between the two is critical to the ability of bat-type sars virus to spread across species, i. E. Currently, the class sars virus detected by scientists in bats is not directly infected with humans. The same virus may not be capable of infecting multiple species, but in the face of life pressure, it is like an influenza virus, which, if they wish, can be achieved by mutation, i. E. By increasing the number of populations and expanding the area。
If the “magic transformation” is completed and the virus is successfully transferred from non-humans to humans, then the virus becomes the “human and animal disease virus”. Known human animals suffer from avian influenza, rabies, foot-and-mouth disease, etc. In a sense, humans are less likely to resist threats from animals, especially from animal diseases. Seeing these names, it is clear that the human and animal disease virus has historically caused enormous human suffering. The virus would normally remain silent in the host body, but it was terrible that the virus could cross the boundaries of the species once the ecological balance was destroyed or the living environment disturbed. Of course, in doing so, viruses can increase the number and geographical distribution of populations, but at the same time they also run a very high risk of killing new hostess as quickly as they move. However, evolutionary theory suggests that, in some cases, the virus will embrace this challenge because it will bring greater ethnic benefits。
Ebola virus patient
In the process of evolution, each creature forms its own unique life trajectory and genetic code, so the virus selects its natural host and selects the target to be infected as a result of evolution in the face of life challenges. Humankind is also engaged in an indefatigable struggle. In the summer of 1967, at a quarantine laboratory in marburg, germany, a staff member suddenly burned, vomited and bled, and shortly after the circulatory system collapsed and died in shock. Subsequently, 37 laboratory staff and their relatives were completely infected with the disease, and a quarter of them tragically died. Three months later, german experts captured the culprit, the new virus transmitted to people by the african green monkey, and the africans named him the nile monster. — ebola; in october 2000, ebola suddenly landed in uganda, and nearly a thousand people were manipulated by the virus. Four hundred and fifty-two people, including a large number of medical personnel involved in the rescue, were bleeding to death; in the face of the current resurgence of the ebola virus, how many scientists were buried in the laboratory; how many health workers were on the front lines of the fight; and how many “recipients” were working in silence without the support of their families。
They are the closest people to this deadly virus because of the presence of an uncontrolled factor that could easily cause infection. Here, i salute those who have dedicated themselves to the ebola virus
