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Depends: There are many kinds of parasites. Most are not transmitted from person to person, but some are. Giardiasis and amebiasis can be transmitted from person to person, usually during sex when there is oral-fecal or oral-anal contact. Pinworms are easily transmitted within households, especially among children. Skin parasites such as scabies and crab lice are also transmitted from person to person. ...Read more
Injury over time: Liver flukes cause chronic inflammation of the biliary system which can over time lead to scarring or abnormal tissues/cells or other problems. Chronic liver fluke infection increase the risks for bile duct cancer (cholangiocarcinoma), gallstones, pancreatitis, liver abscess, and other problems of the biliary tract. ...Read more
T and NK cells: T cells primarily kill virus-infected cells by a cytotoxic mechanism in which the virus proteins are displayed on the surface of the cell by normal cell metabolism and is recognized as foreign by circulating t cells. Natural killer (nk) cells may also play a part. To a lesser extent, b cells may also be involved through antibodies. ...Read more
In a way: Forever is a long time, but cells can be made to turn off their natural cycles which would cause them to die sooner. Cancer cells often develop this trait and thus outlive their host (temporarily). Read the immortal life of henrietta lacks for a good layman's explanation of this process. ...Read more
Not likely: If you have chronic ebv viremia, you should not be donating any blood products including bone marrow or stem cells since the viremia could be transmitted to the recipient. Remember, though, that most of us have had exposure to ebv at some point in their life and so have circulating antibodies and only a few of us have the chronic viremia. ...Read moreSee 1 more doctor answer
Mosquito bites: West nile virus must be produced in high numbers before being passed through mosquitoes. Birds are far and away the most frequent carriers. Robins look like they might be responsible for spread all over the country. Mosquitoes have to feed on the infected robin and then pass the virus on to human beings through a bite. ...Read moreSee 1 more doctor answer
Why is it that the human body does not reject bovine or pig heart valves. Can cells from different animals survive in humans?
Medical technology: The valves are derived from pig or bovine but are treated in a laboratory to remove the antigens that would cause a reaction against them in a human body. Medical technology is amazing! ...Read more
Are any human diseases transmittable through mosquitos? From human to mosquito then back to human?
If humans evolved from apes.Why human body is not as strong as apes or chimpanzees?How to make our bodies(bones and muscles) stronger?
Apes/chimps: Humans are not apes or chimps! Yes, they are strong but would have little to do with you. At your age I strongly recommend you go to a nearby training program. You will be pleasantly surprised and let many of your friends know how good and straightforward it is. ...Read more
What is the origin of human t-lymphotrophic virus? Did it originate from primates (simian viruses?)?
Probably: The human t-lymphotropic virus type i is a human RNA retrovirus that is known to cause adult t-cell leukemia and lymphoma, and a demyelinating disease called htlv-i associated myelopathy/tropical spastic paraparesis. Htlv-i is one of a group of closely related primate t lymphotropic viruses. The ones that infect old-world primates are called simian t-lymphotropic viruses. ...Read more
Not successfully: Animal organs have been used - in experimental circumstances - for a variety of human transplants, without long-term success. Remaining obstacles of rejection are major. When a winning strategy is developed, you will know because we will suddenly be able to address the organ shortage. We can use animal heart valves (usually pig) because they are treated + no longer stimulate an immune response. ...Read moreSee 1 more doctor answer
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