Is BSE caused by bacteria or viruses? 15

Mad cow disease is not foot-and-mouth disease, mad cow disease is caused by eating meat infected with mad cow disease, and foot-and-mouth disease is contracted by artiodactyl mammals, and people cannot get it.

Both diseases are caused by viruses and are zoonotic infectious diseases.

Caused by prions. Prions are replication-capable proteins that do not contain nucleic acids. Mainly attacks the brain cells of mammals.

BSE is a progressive central nervous system lesion that occurs in cattle, with symptoms similar to pruritus

The exact nature of the causes of mad cow disease and scrapie is not yet known, but the most accepted theory is that the most accepted theory is caused by structural mutations in a normal cell called "prion", known as "mad cow".Mad cow is neither a cell or a virus, nor a parasite, and all general measures that can prevent and kill infectious bacteria and viruses cannot effectively kill "mad cow", and there is no direct test method for mad cow in the world.

The spread of BSE is thought to be transmitted by feeding cattle animal meat and bone meal, which has been commonly used for decades to provide livestock protein by feeding meat and bone meal. In the late 70s of the 20th century, there were some changes in the process of making morning socks from animal meat and bone meal, and there is a hypothesis that it was this change in the refining process that led to the survival of sheep itching **, and the spread of sheep itching ** to cattle by raising cattle with meat and bone meal.

The mad cow disease virus is a type of infectious spongiform encephalovirus in humans and animals. It is a progressive, fatal lesion of the central nervous system that occurs in cattle, and the symptoms are similar to those of pruritus in sheep. Its histopathological feature is the vacuolization of neurons in the brain tissue of diseased cattle to form clear pores, which are spongy under the microscope, so it is also called spongy brain virus.

1. BSE virus is an unconventional virus - prion. Prions, also known as protein infecting factors, virulences, or infectious proteins, are a class of small molecule non-immunophobic hydrophobic proteins that can infect animals and replicate in host cells.

2. Prion is the old name of protein, prion means protein virus, prion virus is not strictly speaking, but a class of self-replicating and infectious factors that do not contain nucleic acids but are composed of proteins.

3. Prions are a class of infectious lesions that can cause central nervous system lesions in mammals and humans, and American biologist Squelli Prusiner believes that it is a protein-infecting particle.

It's not a virus, it's a mutated protein.

Nguyen virus is suspected, but it has not been confirmed.

Medical-sourced** dyeing.

For example, blood transfusions from patients infected with mad cow disease; transplantation of organs and biological products from patients infected with BSE; use of unclean medical devices; Brain surgery, etc. Pituitary growth hormone and infertility gonadal hormone used in dwarfism were extracted from a large number of cadavers, and if one of the bodies was Creutzfeldt-Jakob, these products were contaminated.

Drugs of bovine origin.

Drugs made from diseased cow brain, cow spinal cord, cow blood, and bovine bone glue can all transmit mad cow disease.

Ingested BSE-infected beef and beef products.

Because small slaughterhouses often dissect the brain and spinal cord of cattle at the same time as slaughtering cattle, these substances of cows suffering from mad cow disease will contaminate other tissues of cattle, so that the source of infection will spread to other parts of the cattle, and people will be infected with mad cow disease after eating infected beef. After slaughtering the animals, the butcher wipes the knife and cutting board with a rag, which also expands the source of infection.

In the following statements about mad cow disease and prions, Chunzhou contains () that is incorrect.

a.It replicates very quickly.

b.It is a protein-dominated structure.

c.The virus can infect people.

d.There was a lot of research on mad cow disease before it happened.

Correct answer: d

Categories: Healthcare.

Problem description: What is the causative agent of mad cow disease? Urgent! Masters, please come in!

Analysis: Mad cow disease was discovered in the United Kingdom in 1985, developed into ** in the early 90s, and then gradually spread to Western Europe, and has now become a worldwide problem. BSE is a new type of Alzheimer's disease, also known as Creutzfeldt-Jakob disease.

It is a disease that has never been seen before, a chronic, fatal, degenerative disease of the nervous system. It is caused by a pathogenic ——— prion whose nature is not fully understood.

What are the characteristics of prions.

First of all, it has no nucleic acid, which can make normal proteins change from benign to malignant, from non-infectious to infectious; secondly, it does not have the form of a virus and is fibrous; Third, it is resistant to all physical and chemical factors that kill viruses, and the current disinfection methods are useless, and can only be inactivated under 136 high temperature and high pressure for two hours; Fourth, the incubation period of the virus is long, with an average of 28 years from infection to onset, and 100 deaths in half a year to a year once symptoms appear; Fifth, it is difficult to diagnose, there are prion proteins in normal human jeans and animal cells, and its three-dimensional structure changes under the action of unknown reasons, becoming infectious proteins, and the patient does not produce immune reactions and antibodies, so it cannot be monitored.

How mad cow disease is transmitted.

BSE can be transmitted to humans through beef and beef products, especially organ meats and bone marrow.

The transmission of mad cow disease is the first source of infection, such as blood transfusion, medical equipment, brain surgery, organ transplantation, biological product infection, etc. Pituitary growth hormone for dwarfism and gonadal hormone for infertility were both extracted from a large number of cadavers, and if one of the bodies was Creutzfeldt-Jakob disease, all the products were contaminated. There have been hundreds of cases in the United States, the United Kingdom, France, and Australia.

The second is bovine-derived drugs, and drugs made of diseased bovine brain, bovine spinal cord, bovine blood, and bovine bone glue will infect mad cow disease.

What diseases can prions cause.

Prions can cause more than 20 diseases that are common to humans and animals. Perpetrators include Alzheimer's disease (Creutzfeldt-Jakob disease), Kurou disease, Guiss syndrome, fatal familial insomnia, and mad cow disease (variant Creutzfeldt-Jakob disease). In contrast to the usual Creutzfeldt-Jakob disease, BSE mainly affects young people, with an average age of 28 years and the youngest being 14 years old.

How to eradicate mad cow disease in our country.

At present, mad cow disease has not been detected in our country, but we must be vigilant. It is necessary to do: 1. Plug loopholes.

Customs imports and exports should be blocked. Second, check the internal source. It is necessary to check whether our own cattle and sheep have any diseases caused by prions.

Prions break population boundaries and 18 species of animals have now been found to be infected, 16 of which are transmitted through the digestive tract. 3. Strong foundation. At present, prion research has been included in the national "863" project, and has also been funded by the national natural science **, and a number of diagnostic methods with intellectual property rights have been established.

a.Listeria monocytogenes.

b.Prions.

c.Streptococcus.

d.Spirochetes.

Correct Answer: Blind Fight B