How Long Does Hiv Live Outside The Body In The Environment
HIV cant survive for long in the environment. When fluid leaves the body and is exposed to air, it begins to dry up. As drying occurs, the virus becomes damaged and can become inactive. Once inactive, HIV is dead and no longer infectious.
Some research show that, even at levels much higher than usually found in the bodily fluids and blood of people with HIV, 90 to 99 percent of the virus is of being exposed to air.
However, even though exposure to the environment can inactivate the virus, at least several days , even as the fluid dries.
So, can you get HIV from a surface, such as a toilet seat? In short, no. The amount of active virus that would be able to transmit an infection in this scenario is negligible. A case of transmission from a surface has never been reported.
Dried Blood Spots: A Long
In the absence of low-tech point-of-care assays for virological monitoring, an alternative strategy could be the shipment of specimens from peripheral clinics to central laboratories. However, stringent requirements for storage and transport of plasma are barriers in settings with a limited infrastructure. Dried blood spots can be an alternative to plasma samples, and have been used for >40 years to screen for metabolic disorders in neonates. DBS specimens are collected by spotting whole blood onto filter paper , either from venous blood or directly from a finger prick, making this method particularly suitable in rural settings. Furthermore, DBS packed in zip-lock plastic bags with desiccant can be stored and shipped at ambient temperature, thus avoiding the need for cold chain and speedy transport to the laboratory. The consumable costs for DBS are less than US$1 per test, and transport costs are markedly reduced compared with plasma, although the actual assay costs remain unchanged, and the extraction of nucleic acids from DBS involves some extra hands-on time at the central laboratory.,
DBS on a Whatman 903 filter paper.
Drug Resistance Testing Using Dbs
Genotypic resistance testing is mainly used in patients who experience treatment failure, in order to tailor a new fully active regimen. With an increasing number of patients receiving ART for years in resource-limited settings, the need for resistance testing, at a public health level and at an individual level for selected cases, can no longer be neglected. Switching blindly to a new regimen will become virtually impossible when patients need third- and fourth-line ART. Genotypic resistance testing is complex and expensive, and requires advanced laboratories with PCR capacity, limiting its use to major cities. Ideally, a low-tech point-of-care test should be developed, and an acceptable alternative could be a simplified assay only for selected signature mutations.
The WHO, in collaboration with a network of international experts , recently published a laboratory strategy for surveillance of HIV drug resistance, where the use of DBS was recommended in resource-limited settings. This method was successfully employed in surveys of transmitted resistance in Tanzania and Malawi., However, until now, the WHO has only focused on the role of DBS in public health surveillance, and not in the clinical management of individual patients.
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How Does Hiv Spread
HIV spreads when blood or certain bodily fluids that have high amounts of active virus are exposed to ones bloodstream.
For a person to contract HIV, there must be enough active virus in the fluid that encounters the bloodstream. This can occur through:
- a mucous membrane, or moist skin, such as in the mouth, rectum, penis, or vagina
- a significant opening in the skin
Transmission of the virus most often happens during anal or vaginal sex, but it can also occur by sharing needles.
Factors that affect the survival of HIV outside the body include:
- Temperature. HIV stays alive and active when kept in the cold but is killed by heat.
- Sunlight. Ultraviolet light in sunshine damages the virus, so its no longer able to reproduce.
- Amount of virus in the fluid. Generally, the higher the level of HIV virus in the fluid, the longer it will take for all of it to become inactive.
- Level of acidity. HIV survives best at a pH around 7 and becomes inactive when the environment is even just a little more or less acidic.
- Environmental humidity. Drying will lower the viral concentration of active virus as well.
When any of these factors arent perfect for HIV in its environment, survival time of the virus goes down.
How Long Does Hiv Live Outside The Body
There are many myths and misconceptions about how long HIV lives and is infectious in the air or on a surface outside the body.
Unless the virus is kept under specific conditions, the true answer is not very long.
Although it causes a serious disease that cant be cleared by the body, HIV is very fragile in the outside environment. It quickly gets damaged and becomes inactive, or dies. Once inactive, HIV cant become active again, so its the same as if its dead.
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The Challenge: Treating Hiv/aids Where There Is Limited Laboratory Capacity
Immense efforts and resources have been put into the global scale-up of antiretroviral treatment in resource-limited settings in past years. By the end of 2007, 3 million people were receiving ART in low- and middle-income countries, which is a >10-fold increase since 2002. Price reductions on antiretroviral drugs from more than US$10000 to less than US$100 per person per year have been instrumental in the campaign for universal access to ART. Unfortunately, the rollout of treatment programmes has not been accompanied by a similar strengthening of laboratory capacity . While prices for antiretroviral drugs have decreased dramatically due to generic competition, the costs of laboratory equipment needed to monitor treatment have remained high.
HIV testing in rural Tanzania with basic laboratory facilities.
The honeymoon for global scale-up is over. Early treatment success has been reported from ART programmes in many low-income countries, but to uphold the success will demand a sustained effort from donor agencies as well as local ministries of health. Until now the main focus has been on quantity, such as the 3 by 5 initiative from the World Health Organization , which aimed for 3 million people on ART by 2005, and more recently the goal of universal access by 2010. However, as more and more patients are receiving ART worldwide, the focus must shift from rapid scale-up to quality-assured scale-up and ensuring long-term success of therapy.
Dbs In The Therapeutic Cascade Of Care
Reaching and testing persons at risk of HBV, HCV, and HIV is a main challenge as part of the global effort to eliminate these infections as public health threats by 2030 . Diagnosis of viral hepatitis and HIV follows a sequential strategy initiated by serological screening based on the detection of antibodies or antigens, to which succeeds a confirmation step and the therapeutic monitoring . DBS analyses can be integrated into each steps of the diagnosis cascade.
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Conditions By Which Hiv Can Survive
If HIV were to survive outside of the body for more than a few minutes, it could only do so under these specific environmental conditions:
- Colder temperatures: Temperatures below 39 degrees Fahrenheit are considered ideal for HIV to thrive. By contrast, HIV does not do well at room temperature and continues to decline as it reaches and exceeds body temperature .
- Ideal pH: The ideal pH level for HIV is between 7.0 and 8.0, with an optimal pH of 7.1. Anything above or below these levels is considered unsuitable for survival.
- Dried blood: HIV can survive in dried blood at room temperature for up to six days, although the concentrations of virus in dried blood will invariably be low to negligible.
- No UV exposure: HIV survives longer when is not exposed to ultraviolet radiation. UV light quickly degrades viral DNA as well as the lipids that make up the virus’ shell, rendering it incapable of attaching to and infecting other cells.
Even given these parameters, there has yet to be a documented case of infection by means of a discarded syringe in a public place.
In 2008, the largest retrospective study investigating child needlestick injuries concluded that not one case of HIV occurred following contact with a discarded needle.
Moreover, in 2015, the Centers for Disease Control and Prevention could only confirm one infection by means of a needlestick injury since 1999, and that case involved a lab researcher who was working with a live HIV culture.
What Can You Catch From Dried Blood
Hello suffer from EXTREME anxiety which will explain this thread and many would have already seen from my previous posts… I know I am going to get slated for this thread but my head is in overdrive…Today I had a piece of furniture delivered – around 8am. It was left in its wrapping in a room where the window was open.About 11ish I started unwrapping it – I saw a small spot of what looked like blood… I thought I should wipe it with it off but I was in a rush and thought just to remember it was there.I pulled the cellophane off and moved the item into position.I went to get a black sack to put the rubbish in and I have an awful habit of chewing my finger which I recall doing.I put the rubbish in the sack and in the bin.I ha e since been thinking what if I touched the red mark and then put my fingers in my mouth? Could you catch anything from this?My main concern is Im still breastfeeding and I feel sick thinking about it.I know I am being totally unreasonable and maybe I just need someone to tell me this it is theee any risk?
From a tiny amount of possible dried blood such as you’ve described? Nothing. Any viruses in it wouldn’t be present in sufficient amounts to cause my problems, have been exposed to the air and various temperature changes long enough to kill them, and from the sounds of it haven’t made contact with unbroken skin.It’s more likely paint, pen, or some sort of food.
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What Does Old Dried Blood Look Like
If blood is present in a spill, it fizzes. Some people use this hydrogen peroxide on dried stains or residue as well. If there is blood present in the residue, it may not fizz if it is old.
Also, can you get DNA from old dried blood? DNA has traditionally been extracted from dried blood using dried blood spots on filter paper. However, studies conducted using this method found that it often required labor-intensive protocols and multiple extraction steps, difficult to perform during field studies.
Then, can you tell how old dried blood is?
Non-Destructive Age Testing of BloodstainsRaman spectroscopy and advanced statistics allow the researchers to date a blood stain accurately, provided said blood stain is less than two years old. Raman spectroscopy involves shining a laser on a sample and measuring the intensity of scattered light.
How long does DNA last in dried blood?
Semen Vaginal Fluids And Anal Mucus
If an HIV positive person has sex without a condom, and they do not have an undetectable viral load, HIV can get into the other persons blood because it lives in the semen, vaginal fluid and anal mucus. There does need to be a tear or graze in the other person for the HIV to enter into their body. A condom stops any fluid being passed to the other person, and it also stops unwanted pregnancy and getting other sexually transmitted infections.;
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Survival Of Hiv Virus Outside The Body
;Answered by: ;Dr LM Nath;; |;Consultant, Community Medicine,New Delhi
Q:;Hello Doctor: 1) How long does the HIV virus survive outside the body?; 2) does the HIV virus survive on dried blood stains or any body fluid which is present on a needle or scissor or any other device that is placed in a desk/cupboard . I am anxious to know answers to these 2 questions because I accidentally came in contact with a scissors that is placed in a closed cupboard . I will be very grateful to you for your kind information.
A:Exactly how long HIV virus survives outside the body depends on a lot of factors such as temperature, presence of fluids/moisture etc. On the other hand, HIV infected blood stored in a blood bank can remain infective for weeks or as long as the blood is adequately stored. Suffice it to say that under normal conditions, virus present in blood or other body fluids does not survive for long if the fluids dry up, or are exposed to sun or heat. This time is a matter of hours at most. Dried blood stains on instruments such as knives or scissors would not expect to have viable HIV after the stains are thoroghly dry whether the instruments were stored in a cupboard or in the open. As far as your accidental exposure to a blood stained scissor, please do not worry as there is no chance that you would be infected.
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Mother To Child Transmission
Having HIV does not mean a woman cant have a healthy baby. The key is to work with a doctor to take all the necessary precautions.
Aside from blood and sexual secretions, HIV can also be transmitted during pregnancy or through breast milk while breastfeeding. Mother to child transmissions can also occur at any point during pregnancy, as well as during delivery.
All pregnant women should be screened for HIV. Antiretroviral therapy is strongly recommended for pregnant women with HIV to achieve viral suppression. This will subsequently reduce the risk of transmitting HIV to the baby during pregnancy and labor. Sometimes a caesarean delivery is recommended to reduce transmission during delivery if the infection is not suppressed.
Its also important to protect the baby after birth. Breastfeeding might not be recommended in some cases, though consistent viral suppression may reduce the transmission of HIV through breast milk. A doctor may also recommend that the baby take antiretroviral therapy for up to six weeks after birth.
Overall, great strides have been made in decreasing HIV transmission between mothers and infants due to improved screening and use of anti-HIV drugs during pregnancy.
In the United States, the
Can Someone Get Hiv From Swallowing The Blood Of A Person
- ated with blood or other body fluids* can expose you to a bloodborne disease through cross-conta
- HIV can also be transmitted by sharing needles and using blood containing HIV. Pregnant people with HIV can transmit the virus to their child during pregnancy, delivery, and breastfeeding
- g You cannot acquire or pass on HIV by rim
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How To Avoid Getting Hiv
Abstinence, or not having sex, is the only type of protection that works every time. But if you are having sex, you can lower your risk if you:
- Use a condom every time you have sex
- Get tested for HIV and STDs
- Limit the number of people you have sex with
- Donât inject yourself with drugs
Talk to your doctor right away if you think youâve been exposed to the virus. They can help you figure out next steps.
Serological And Molecular Testing Using Dbs In The Field
Heterogeneity in the pre-analytical procedures used for DBS specimens between laboratories influence the result and make comparisons difficult. The size of the spot, the nature of the elution buffer, the elution volume and therefore the dilution factor -, the extraction technique, impact the performance of the tests. WHO guidelines for the implementation of HIV viral load and viral hepatitis tests stress the need for the manufacturers to provide application notes for the use of DBS, and at best to pursue regulatory approval for in vitro diagnostics using DBS specimens . The bioMerieux Nuclisens and Abbott RealTime HIV-1 viral load kits have obtained regulatory approval for use on DBS. On this matrix, the detection threshold is 802 copies/ml for the bioMerieux test and 839 copies/ml for the Abbott test . However, a study has shown that the detection rate does not reach 95% for viral loads between 1000 and 5000 RNA copies/mL . WHO pre-qualification of the Abbott HIV test on DBS, report a sensitivity of 76.0% and a specificity of 89.7% at the threshold of 1000 RNA copies/mL . Several qualitative RNA/DNA tests have regulatory approval for the perinatal diagnosis of HIV infection on DBS: the Cepheid XPERT HIV-1 QUAL test that detects HIV-1 DNA and RNA, the Abbott RealTime Qualitative test, as well as the Roche COBAS qualitative test.
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Can You Get Hiv From A Blood Transfusion
Receiving a blood transfusion or other products made from blood is safe in the UK as all blood products have been screened for infections such as HIV since 1985.
In countries that dont have strict checks on the safety of their blood supply, receiving contaminated blood can pass the virus on. This can also happen in countries that dont screen other blood products, organs or sperm.
Giving blood has never been a risk.