Questions tagged [immune-system]

The group of cellular and molecular processes that the body uses to fight bacterial, viral, and parasitic infections. Autoimmune and inflammatory disease are caused by malfunctioning of this system and should also be tagged with the disease name.

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APC cells - autoreactivity

How can APC cells become autoreactiv against own antigens if they only have PRR as recognition complexes - and are not under central/peripheral immune tolerance?
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Does conscious sleep impair immunity?

It's common knowledge that getting insufficient sleep makes people immune-compromised. However, what about light rest? In particular, if you spend a significant amount of sleeping hours conscious (...
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Do I need to get re-immunized for immunities received prior to contracting measles?

One study has suggested that measles can lead to "immune memory loss", meaning immunities gained prior to measles infection can be lost. I had measles at age six. According to the (current) CDC ...
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how does the immune system identify allergens? application: varenicline and lobeline

I'm wondering if we know how the immune system identifies allergens. My biochemistry knowledge is basic so I apologize if I use concepts incorrectly! Specifically, I want to know about the likelihood ...
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Why don't leave HIV infected people in aseptic environment until they're cured?

Sorry if the question is silly, but this is something that has been around my head for years: As far as I know, the HIVirus feeds itself out of the inmune cells (from Wikipedia, emphasis mine): ...
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How can a bone marrow transplant from a donor of a different blood type not get rejected?

As discussed here, one can change their blood type by getting a bone marrow transplant from a donor with a different blood type. Why would the bone marrow not be rejected, as the body's immune ...
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How does immunosuppressant affect immune system?

I'm talking Immuran (azathioprine) and I would like to know what it does to immune system exactly. I'm not a doctor but I'm asking here just to learn. Does it kill all white cells? Does it reduce the ...
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Is the second vaccine dose necessary if seroconversion occurred after the first dose?

My question is applicable to all multi-dose vaccines with vaccination intervals of several weeks, though the specific case that triggered my question was the chickenpox vaccine Varilrix/GSK. My ...
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Is there an immune deficiency disorder that fits this description?

I've been trying to do some research for a writing project, but I need some advice to help me identify what specific things I should be researching, because "immune deficiency" in general brings up a ...
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Does the saliva of a person just recovered from an infectious disease help to cure another persons having the same disease?

I have always had this 'weird' thought (But could never quite test it...). Would the saliva contain antibodies, or other immuno-boosting substances that can help fight off the same pathogen in another ...
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What caused J&J's Procrit to be so deadly?

I just finished reading Blood Medicine and I'm wondering, what made Procrit/epogen so deadly, if it was from natural sources? Was it an immune reaction?
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How can an oral antigen help meniere's syndrome?

Can giving a sublingual antigen to a virus (e.g. herpes) whilst concomitantly giving antiviral drugs help with meniere's syndrome? The aim being to encourage the Mucosal Associated Lymphoid Tissue (...
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Does being infected protect one from further infection?

Does being infected protect one from further infection? Intuition for why it could be the case When one catch an infective disease, its immune system becomes more active which could eventually also ...
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What is the average recovery time for cold and catarrh

I've been having cold and catarrh for the past one week. I don't want to disturb my parents about medicines, so I drink lots of water everyday, but doesn't seem to have any improvement. Q1: What is ...
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How long is combined Meningoccocal ACWY vaccine effective for?

If I have the combined ACWY vaccine against meningococcal meningitis, how long should it make me immune to this group of diseases for?
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Immunity after a GI bug

Common wisdom is that once you've been infected with a cold virus, you are then immune to that specific virus. Obviously there are hundreds of cold viruses, so you can keep getting colds. Does the ...
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Can an infection with toxoplasma gondii be cured with the current medical state of the art?

According to the CDC, toxoplasma gondii is purported to be present in approximately 22.5% of those in the US above the age of 12, and is present in some populations worldwide at an incidence rate of ...
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has your body killed a cold virus before you experience any symptoms?

A friend tells me that by the time you feel the first symptoms of a cold (runny nose, sore throat, whatever the first symptoms are), your immune system has actually already killed the virus, and the ...
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Is the common cold deadly to a suppressed immune system?

If you were taking an immune system suppressant such as Prograf (Tacrolimus) for a long period of time would a virus like the common cold linger in the body and cause infection over time and possibly ...
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Does fasting improve your immune system even when you are already having some infection?

I am one of the self-motivated activists who run some groups to answer various misconceptions about science and try to fight against ignorance, pseudo-sciences and blind faiths. I was recently asked ...
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Is it possible to get a secondary infection following a flu shot

Can a flu shot entail a risk of secondary infection like a real flu? I just had my flu shot today and the resulting faux-flu is hitting me hard with fever, cough, aches, etc. I was wondering if the ...
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What is the minimum exposure to a virus to acheive immunization?

Is it possible to gain immunity against a virus if the exposure to the virus is not large enough to cause any clinical symptoms? And if so, would the immunity achieved without symptoms be as strong as ...
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Tetanus antibodies

I received a tetanus vaccination less than 10 years ago when I was in the military. I recently started donating plasma and donation center gave me another tetanus shot to boost the tetanus antibodies ...
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no medication treatments for MS

What are the no-medication treatments for Multiple sclerosis (MS) ? Based on many papers, sport and meditation can help to keep the immune system and the body healthier which leads to a higher level ...
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Can fasting destroy our adaptive immune system?

Fasting for 72 hours been shown to lead to white blood cell regeneration (1). The cells basically die after several days, and are created again from stem cells upon feeding. This article describes how ...
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Are apples really better for the immune system than most fruit?

"An apple a day keeps the doctor away", the saying goes, implying that apples are somehow especially good for the immune system. But does this idiom have any validity to it? Are apples high in ...
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What is the difference between the TDAP and DTAP vaccines?

What is the difference between the TDAP and DTAP vaccines? Some nurses/pharmacists told me they are the same, but I am not convinced. If they are the same then why would some organizations request ...
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Does antibiotics weaken immune system or causes Fever [closed]

If your popping antibiotics everyday, prescribed by your doctor though he asked you to revisit after two months and warned you to ignore any fever symptoms during these two months. I'm just wondering ...
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Tonsillitis and tonsillectomy confusion

I have read the article here, and I am confused on why the tonsils have to be removed. Are tonsils removed when they themselves incur frequent/prolonged infection? The source I stated above does not ...
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Is only the height of the spleen concerning? [closed]

Say you have a spleen size of 12.2cm by 11.8cm by 6.2cm when it should be 11cm by 6.5cm by 5.5cm (correct me if I'm wrong on the norm!), is only the height i.e. 11cm or 12.2cm matter I stated above?
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Can blood transfusion help in case of scleroderma?

Can blood transfer can somehow help a case of scleroderma? I know it's not the way to cure it, but I was just wondering if this can slow down the body destruction made by the faulty lymphocytes. ...
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Does laughing improve immune system?

From this question, I learn ways of the boosting immune system, but i didn't find main word laughing, so does laughing improve immune system?
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In a viral infection, which symptoms are caused by the virus itself, and which symptoms are caused by the body fighting the virus? [closed]

Most symptoms commonly associated with respiratory viral infections, like the common cold, are actually immune in nature. Fever is the body's attempt to overheat the virus, excess mucous is the body's ...
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Can pathogens be transmitted from smelling something?

Long story short, when visiting neighbors the other day, a young child playing outside in the lawn stepped in some fresh animal fecal matter, and not knowing what it was, ended up taking off their ...
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Delayed vaccination: effect on the immune system

While researching child vaccinations, I found (and will presume was sufficiently verified by the WSJ) that the typical 5-6 vaccines given to a child contain only 150 antigens, while the child's body ...
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Can allergies “generalize” to other substances present during an allergic reaction?

I've heard some claims that allergic reactions to one substance can "generalize" to other substances present at the same time. For example: A person is allergic to lobster, but not to clams. The ...
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Can applying pressure to joints provide some health benefits?

My question goes beyond the obvious wisdom of not being sedentary. I was told by someone, with a fair amount of medical training, of the benefits of applying pressure to the joints and connective ...
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Is there a benefit to taking whey protein to increase glutathione level compared to the body's natural production?

Glutathione is a strong antioxidant needed for many processes in the body. High levels of glutathione have been linked to strong immune systems, heavy metals elimination, lower inflammation, lower ...
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Is there evidence that the over-avoidance of germs weakens our immune system?

Is there evidence that the over-avoidance of germs weakens our immune system? Or vice versa: Does the under-avoidance of germs strengthen our immune system? For some reason I hold the opinion that ...
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How do steroids work in treating a multiple sclerosis relapse?

I have been trying to find this out with no luck. I understand that they don't affect the long term progression of the disease so don't seem to affect the demyelination, but I'm not sure how they ...
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Why are peanut allergies so much more severe than other food allergies?

Based on my understanding of how adaptive immune responses arise, I would expect peanut allergies to be roughly normally distributed with regard to severity, like other food allergies. However, peanut ...
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Why would anyone choose a trivalent flu shot when there are thimerosal-free quadrivalent ones available?

My understanding is that quadrivalent flu shots are designed to build immunity to 4 flu virus strains, while trivalent flu shots are designed to build immunity to 3 flu virus strains. Is this ...
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How does a breeze cause irritated nose and throat?

The question popped in my head as to how a breeze (let's say one from a ventilator or ACU) can cause irritation in certain respiratory systems (e.g. nose/throat). I haven't really found a suitable ...
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Does the immune system recieve equivalent results when doing inactive exercise like when doing active exercise?

If I use a pedal exerciser, my legs need to actively push the pedal. However, if I attach my feet on the machinery pedal, and let the machine rotates, my legs are still moving. I call that "inactive ...
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What happens to HIV once it completely destroys the immune system?

Today, in my high school health class we were learning about HIV and AIDS, and I was wondering what would happen to HIV if it killed off all of the cells that it uses to reproduce. For example, ...
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What is the mechanism of eczema?

I'm trying to link the signs and symptoms of eczema (especially atopic dermatitis) to its causes. In short, what is the mechanism of the disease? In an answer of another question about eczema, @...
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Can being cold or wet be a significant influence in getting the common cold?

As most people know, it's a common thing to say something like "better wear a sweater, otherwise I'll get the cold tomorrow." In my limited understanding, the common cold is caused by a virus. How ...
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What are the health benefits of consuming oligonol?

Oligonol are polyphenols found in lychee fruit. Image credits: Loving Themes I've heard that it has antioxidant properties which can fight the virus infections and it's used as a natural remedy for ...
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Can typhoid occur multiple times?

Are there any chances of a person being reinfected with typhoid at regular intervals again if they don't follow proper medication and diet, even though they are cured or survived the first infection? ...
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Do some people gain high immunity genetically? [closed]

I've seen many people who live in the same environmental conditions as that of mine but they never got infected by cold. For example my father would get cold only one or two times a year but I get ...