Questions tagged [hiv]

The Human Immunodeficiency Virus (HIV) is a single-stranded RNA virus which reproduces in human CD4-positive cells, which are primarily T-helper lymphocytes and macrophages. HIV is the causative pathogen of Acquired Immunodeficiency Syndrome (AIDS).

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Can HIV be transmitted via mosquitos?

It is known that HIV is usually transmitted by direct blood or body fluid contact between an infected individual and a healthy person (like blood transfusion or needle sharing): Suppose a mosquito ...
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Eradication of HIV

If the last person with AIDS dies, does that mean the disease/virus has been eradicated forever? Since the disease can ever only be transmitted, shouldn't it be possible to completely remove it from ...
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For how long viruses survive in non-air moisture environments?

On the Internet there are plenty of information that viruses don't live long after they were exposed to air, after they starting to dry out. But it's hard to find an information on how long viruses ...
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322 views

Why do doctors still advise HIV+ couples to wear a condom during sex?

HIV infected people already have HIV, but why do doctors still advise condom use for HIV+ couples?
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T-cell “exhaustion” in patients with Covid-19

Following up on my previously asked question, which asks how COVID infects T-cells in immune system. Here's a study that shows that recovered covid patients have "exausted t-cells". To quote: T ...
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1answer
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Can Covid-19 (similarly to HIV) infect T-Cells?

I'm interested in better understanding this Nature publication, discussing the potential for Covid to infect t-cells. After describing the results they conclude: "Based on the results of pseudovirus ...
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Why can't we always create a vaccine against a virus when an ELISA test to detect it is possible?

Before precising my question, here are some facts that I presume to be true: A vaccine works by injecting the antigens of a virus into the body to train the immune system to recognize the virus and ...
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Could HIV drug treat Normal Corona Virus? [closed]

SMS Hospital of Rajasthan treated three patients of Corona virus with a combination of two anti HIV drugs. Rohit Kumar Singh, Additional chief secretary of Medical and health said:- "All this ...
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1answer
35 views

How much of the genotype-phenotype map do we understand in HIV?

From what I understand, viruses have very small genomes relative to those of standard model organisms used in biological research. For example, according to Wikipedia, "the HIV genome contains nine ...
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What are the potential dangers (if any) facing the twin girls recently born in China with their CCR5 gene modified?

According to this Nature news article, a Chinese researcher claims to have made the world's first genome-edited baby using the popular CRISPR–Cas9 genome-editing tool. A gene called CCR5 was modified ...
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1answer
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Viral RNA to DNA

I have a question concerning reverse transcriptase. Why is it that when the viral rna is converted to viral dna( as in the case for hiv), the virus develops resistance to medicine? Under what ...
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1answer
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What advantages could there be for using the unseen variant chosen by He Jiankui instead of the naturally occurring CCR5-∆ 32 mutation?

Jennifer Doudna mentioned in https://youtu.be/9Yblg9wDHZA?t=2566 on 2019-02-21 that He Jiankui introduced an unseen variant of the CCR5 gene when gene editing the twin humans Lulu and Nana. What ...
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Can people with AIDS get tattoos?

When I do a Google search, most of the results are about whether or not people can get HIV / AIDS from getting a tattoo through dirt needles. I am, however, curious whether or not it is possible to ...
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What are the effects of removing CD4 receptors?

If the gene for the CD4 receptor was removed, would the person's immune system work normally? Could a new artificial receptor be substituted in place of CD4? Could HIV infection be prevented in this ...
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1answer
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Does the mutation CCR5-delta 32 increase the genetic info?

My understanding is that the mutation CCR5-delta 32 caused the CCR5 co-receptor to be of a different shape, resulting HIV virus to not be able to attach itself to it. My question, this shape/mutation,...
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Which cells are prefered by the HIV virus to establish an infection?

We always read that HIV infects CD4 cells, macrophages, and dendritic cells. However, is it a common event for HIV to infect non-immune cells within a host? If not, why? And also if not, why are ...
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Why doesn't HIV spread through vectors? [duplicate]

HIV spreads only through body fluids. If a mosquito bites an HIV infected individual and then an uninfected individual, will the virus spread to the new individual?
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Why AZT is selective towards HIV and doesn't impair human DNA replication?

I've found this article, which is a very old one (from the time when nucleoside analogs where researched as a possible way to prevent replication of virus genetic material, before the HIV epidemics). ...
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1answer
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Does reversion of resistant strains to wild-type only occur when no more drug pressure is exerted

We always read that wild-type reversion of a resistant strain occurs when no more drug pressure is exerted. Could resistance reversion also occur under drug pressure, but from a drug other than the ...
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Why is AIDS not a congenital disease?

AIDS can easily pass from mother to the newborn, then why do we not consider it to be a congenital disease (or syndrome)
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Can people with AIDS/HIV be vaccinated?

If there is no immune system,it seems like vaccines wouldn't do much since there is no adaptive immune system to develop antibodies and memory cells. But can people with AIDS/HIV still be vaccinated? ...
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How do opportunistic infections affect an immunocompromised or AIDS patient?

I mean, everyone knows that AIDS patients don't die of the HIV infection, rather the opportunistic infections. But if HIV only affects T lymphocytes, and destroys them, then that means only cell ...
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Why human body cannot defend against HIV? [closed]

Some says that HIV destroy IRF3, and some says HIV overruns T-cells.
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How is TB harmful in HIV patients?

The mycobacterium of TB doesn't secrete any toxins. The cause of disease in the immunocompetent is the collateral damage due to the immune response against disseminated infection. But then, when HIV ...
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Can the RNA in the HIV virus make viral enzymes without entering the nucleus?

If the provirus was not formed yet, can the virus make viral enzymes? (I know that it already has some, but supposing it doesn't)
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Do we know that PrEP actually prevents infection, rather than masking it?

Pre-exposure prophylactic treatment (PrEP) for HIV is commonly said to reduce infection rates by more than 75%. Similar treatments for already-infected patient treatments do not cure HIV, but reduce ...
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1answer
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An alternate cure for AIDS?

Is is possible to cure AIDS patients by using white blood cells of blood cancer, by fooling HIV to attack a false target? Is it possible to wrap HIV in a physical boundary, such that it has no ...
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Why HIV need integrase enzyme to integrate their DNA into host cell?

In gene transfer by microinjection, the gene of interest is injected into the nucleus of host cell without using integrase enzyme. So why does HIV need that enzyme? Why they not just place their DNA ...
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Why does HIV chooses the Macrophage cells to infect first?

Upon entering our body HIV directs the macrophage cells to manufacture more virus particles. It injects the Viral RNA into the Macrophages. With the help of the enzyme reverse transcriptase the Viral ...
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Can HIV mutate to become airborne?

HIV has a very high mutation rate due to its inability to correct errors in DNA replication and it is very adaptable to its environment. Hence I wonder whether is it possible for it to mutate such ...
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CD4+ as Monocytes cell surface receptors

Today in class, our teacher was discussing about the pathogenecity of the HIV virus. He said that the binding between HIV virus and macrophages is done by the interaction between the GP120 of the ...
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Why is HIV so large compared to other viruses?

The HIV-1 virus is about 120-150 nm in size and has a genome only about 10,000 base pairs long. Other viruses are far more efficient, for example lambda phage has something like a tenth the volume ...
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Why is an HIV infection considered “incurable”?

My biology teacher told me that if one caught HIV, they cannot be cured because it was near to impossible to be completely virus-free. She said this was because HIV keeps on changing its glycoprotein ...
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why hiv genome not attacked by lysosome in macrophage

HIV cells lifecycle in macrophages suggests the early phase with naked genome entering the macrophage along with reverse trancriptase enzyme. i am thinking that macrophages are abundant with lysosomes ...
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858 views

Are these statements about the effectiveness of condoms in preventing HIV transmission reconcilable? [closed]

Can the following statements be reconciled: Condoms form an essentially impermeable barrier to HIV Sexual activities other than penetration carry a very low risk of transmission The consistent use of ...
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T lymphocytes and HIV-AIDS

in studying maturation of lymphocytes into two different types-T LYMPHOCYTES and B LYMPHOCYTES. it is mentioned that if a lymphocyte matures in thymus gland it becomes T LYMPHOCYTE and becomes B ...
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1answer
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Engineered CD8 T-cell therapy for HIV infection

CD8 T-cells are effective in controlling HIV during the early phase of the infection. However by the time, the virus mutates and develops an evasion mechanism against CD8 T-cells. Since cancer cells ...
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Is Berlin patient immune to HIV after bone marrow transplant? [closed]

Is the Berlin patient here : https://biology.stackexchange.com/a/39364 become immune to HIV after bone marrow transplant? Or in other words: Can he get HIV infection again?
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How did scientists discover HIV?

Imagining that we're now in 1983 (when HIV was discovered), there were no modern machines at that time to sequence massive genome extracted from blood. There was a strange disease and no one know what ...
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Meaning of “U” in “Viral Protein U”

What does U mean in Viral protein U? Viral protein U (Vpu) is a unique gene product of human immunodeficiency virus (HIV) type 1 (HIV-1) with two well-described functions... So does U in this case ...
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Can HIV be automatically cured by waiting until CD4 T cells count drop to 0?

As I know, HIV needs host cell, CD4 T cell to repicate itself, and at late stage of AIDS, count of this cell in patient will drop to 0, my question is, if we can provide a sterilised environment for ...
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It is possible for person with AIDS be negative for HIV antibodies?

I'm just curious as there was a bit controversy around this topic. It is possible for person with AIDS be negative for HIV antibodies? As of 1989, the CDC reported that 5% of all U.S. AIDS patients ...
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Why does HIV belong to a group of retroviruses called lentiviruses?

HIV is an enveloped retrovirus. Each virus particle contains two copies of an RNA genome. The virus also has a number of enzymes: reverse transcriptase, integrase and viral protease. But, once I also ...
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How much time does HIV live outside the body? [closed]

I'm wondering HIV viability outside the body of an infected person, for example in a knife that contains blood of an infected person, with N virus cells. (N could be for example, 1000). Some virus ...
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Do HIV particles die without host cells?

When a person is on antiretroviral therapy (ART) which blocks HIV particles from infecting cells, where do those particles go? Do they die out while floating in the bloodstream? I particularly want to ...