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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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Does increasing “allergy” histamine affect “wake” histamine? Do both respond to the same triggers?

I understand that histamine is used by the body as part of the immune response, widening blood vessels, etc., to aid the white blood cells in their attack. Often this ends up helping them attack ...
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How does CD8 cells kills virus infected cells?

I have read Virus infected cells doesn't express MHC class 1 and cd8 cell can recognize and kill intracellular pathogens by looking at MHC complex. If virus infected cells cannot express MHC class ...
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Is it possible to be allergic to corn but not popcorn?

Is it possible for a person to be allergic to one subspecies and not another of the same parent species? For instance, can a person be allergic to sweet corn but not popcorn (both subspecies of Zea ...
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Would it possible for me to get tested for past viral infection after vaccination?

I may or may not have a viral infection in the past and then I took vaccination for it. Would it possible for me to get tested for past viral infection? For example HPV virus using IGG test.
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If I'm suspecting someone I know has an exceptionally good immune system - can this be tested somehow?

Please note this is NOT a personal medical consultation. If I have reason to think that someone I know has an immune system that is exceptionally good (they are very rarely sick, almost never get ...
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Getting another vaccine 3 days after MMR vaccine?

I have been given first dose MMR (+2 others) vaccine on 19th May and second dose (+1 other) on 21st June. After that I have been given tdap vaccine on 24th June in a different clinic. Now I hear ...
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Does vaccination weaken the immune system ? Studies?

A friend recognizes value in vaccinating in general - against major diseases - but with a caveat that they are opposed to the flu vaccine specifically. They claim that vaccines weaken the immune ...
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Why should we finish antibiotic treatments in order to prevent antibiotics resistance?

I understand bacteria can mutate and develop resistance against antibiotics, but I do not understand how finishing an antibiotics treatment prevents this. In my simple thought process, when an ...
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Is it known how often unvaccinated children are contagious with symptom free diseases?

I was looking at the CDC Vaccine Schedule for children, and it says that many of the things kids are vaccinated for may show no symptoms. Do any of those diseases –– mainly haemophilus influenzae, ...
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Immune system recovery from chemo

I'd like to know if your immune system will recover from chemo (e.g. after x years), or will your immune system forever be weakened/compromised from chemotherapy?
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Does stopping fever hinder the process of killing bacteria via fever?

Since the body produces fever in order to kill bacteria, wouldn't decreasing the fever by taking anti fever medication decrease the body's ability to fight the bacteria? Assuming you have non life ...
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Why does the flu commonly cause cold chills while a cold does not?

The flu commonly causes cold chills, even though a cold doesn't usually. Why?
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How is it possible for someone to suffer repeated bouts of flu?

About a month and a half ago I caught flu... recovered fairly quickly (2 days), and then 1 week later I caught another one, again, recovered even faster (just 1 day, a good night sleep) and a week ago ...
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Are allergies due to memory T cells for benign antigens?

If I understand correctly, the immune system reacts to infections by priming virgin helper T cells for the particular antigens exposed on the surface of the invader, leaving some memory T cells ...
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Can the body delay infections/sickness for important reasons?

Background of the question: I worked on a very important project which was also critical for the firm and would have affected the employment permanently if it failed. During that time several ...
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Does being overly attentive to hygiene impair your immune system?

Like a lot of Japanese girls, I'm a bit obsessed with personal hygiene. Sometimes I get up 2AM to have a shower... after already having one before going to sleep, because something just doesn't feel "...
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How does interferon beta 1-A help patients with MS?

I know that Azathioprine lowers the immune system by reducing WBC count. I've read that interferon boosts the immune system against viruses. I think they have opposite functions but the treat the same ...
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Ulcerative Colitis Disease Activity

Ulcerative colitis can be endoscopically assessed and characterized as 'active' or 'inactive'. I was wondering how those disease states are related. Do patients with UC regularly alternate between ...
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Why are two influenza vaccinations required for people under a certain age?

According to the CDC, people under 8 who have never had the flu vaccine or flu should get 2 doses at least 28 days apart. The reason given is that "the first dose 'primes' the immune system," but as ...
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What is Immunotherapy for cancers?

I have heard a lot about immunotherapy in the last 2 years. It is not used in many countries and is still under testing. What is immunotherapy? (I need a simple explanation, I am not a doctor) How ...
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On the mechanics of chickenpox immunity for newborns and breastmilk antibody transfer

According to my healthcare provider, a newborn should not be affected by chicken pox if it has immunity thanks to his mother having had the infection as a child herself - this immunity is apparently ...
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Is there a direct correlation between high testosterone level and weak immune system?

I tried googling it, the only credible link I found is this: https://med.stanford.edu/news/all-news/2013/12/in-men-high-testosterone-can-mean-weakened-immune-response-study-finds.html Can someone ...
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How can a person make his/her immune system stronger and prevent flu?

If someone is getting flu frequently, how can he/she make his/her immune system become stronger? And what should he/she eat for daily meals?
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How does donepezil impact the immune system?

Is it immunosuppressive? If so, to what extent? What are the mechanisms for this effect?
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Can amphetamines suppress reactivity to scratch testing (for immunotherapy)?

My understanding's that amphetamines are immunosuppressive... Theoretically, couldn't these drugs result in false negatives?
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Immune system & methylphenidate?

How and to what extent does methylphenidate impact immune system function? How does its impact compare to that of amphetamines?
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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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Diabetes and electricity

Several years ago I had this school trip to a science event, and I was selected to be a part of an experiment that I was holding the tip of some kind of electric machine (which I think could kill me ...
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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 ...