Om hiv og aids

Hiv er et virus som medfører svekkelse av immunforsvaret slik at kroppen er mer mottakelig for infeksjoner og sykdom. Aids er diagnosen som brukes ved langtkommet hivinfeksjon med komplikasjoner.


There is currently no curative treatment for HIV (human immunodeficiency virus). The virus can lead to serious illness and death, but with modern treatments, life expectancy is now much improved.

Treatment usually consists of combinations of several different antiviral drugs. With effective treatment, most people with HIV infection can live a long and happy life with a reduced risk of serious medical complications. HIV-infected people who are treated appropriately with antiviral medications will have very little or no detectable viral load in their blood. It has been shown in practice that appropriately treated patients do not infect their sexual partners.

How HIV is transmitted

HIV occurs in the bodily fluids of the infected person. The bodily fluids that contain enough virus to transmit infection are blood, semen, vaginal secretions and breast milk. Other bodily fluids (sweat, tears, saliva and urine) contain negligible amounts of virus, and coming into contact with these does not pose a risk of infection.

Sexual contact

Sexual contact is the most common mode of transmission. Over 90 per cent of infection occurs through sexual contact. On a global basis, heterosexual infection is by far the most common, while in Western countries, infection among men who have sex with other men has been dominant.

The virus is transmitted by blood, semen or vaginal secretions coming into contact with the mucous membranes of another person. Mucous membranes are found in the vagina, urethra, rectum, mouth and eyes. Infection through sexual contact can therefore occur through vaginal/anal intercourse or oral sex. HIV is transmitted more easily from men to women than vice versa. Anal intercourse is considered to entail the highest risk, and among men who have sex with other men, the recipient (the person receiving the sperm) is at greatest risk. Having another sexually transmitted disease (chlamydia, gonorrhoea, herpes, syphilis or other diseases with ulcers or damage to mucous membranes) increases the risk of transmission of HIV through sexual contact.

Infection via blood

HIV can be transmitted by blood transfusion, a risk that has now been virtually eliminated in Norway due to testing of blood donors and heat treatment of a range of blood products. In rare cases, HIV can also be transmitted through direct contact with blood in mucous membranes or open wounds or through puncture wounds. HIV can be spread among people who take "substances" using syringes by sharing syringes, needles or other drug paraphernalia.

From mother to child

The risk of infection being passed from an untreated mother to their child during pregnancy, birth and breastfeeding is approximately 30 per cent. This risk can be reduced to less than 1 per cent by antiviral treatment of the pregnant woman and the baby during the first few weeks after birth, as well as by not breastfeeding.  

Symptoms of HIV

Many people who are infected with HIV have few or no symptoms of illness for several years after they became infected.

Approximately half of those infected will develop what is known as a ‘primary infection’ two to four weeks after becoming infected. The symptoms may resemble influenza or mononucleosis, with fever, sore throat and muscle and joint pain. Some people also develop rashes and enlarged lymph nodes.

These symptoms usually disappear within three weeks and the infected person feels completely healthy again. The viral load in the blood after infection will gradually decrease over the course of four to six months, and then stabilise at a certain level. This level varies greatly from person to person. People with a consistently high viral load develop the disease faster than those with a lower viral load.

Symptoms of more advanced HIV disease can be many and difficult to distinguish from a number of other diseases.

The most serious stage in the development of the disease is called AIDS (acquired immunodeficiency syndrome) and is often detected in connection with an outbreak of what is known as an ‘opportunistic infection’. In a person who is infected with HIV, the first signs of AIDS may also be prolonged fever or diarrhoea, significant and unexplained weight loss or certain forms of cancer.  

When should you get tested?

Patients will normally be offered an HIV test in the event of diffuse symptoms and in connection with the assessment of some diseases.

If you want an HIV test even though your doctor has not suggested one, you should explain why you would like to have the test, regardless of whether or not you are showing any signs of HIV infection. This is especially true not only after you have had unprotected sex with someone who may be infected, but also when the presence of another sexually transmitted infection (STI) is detected.

How is the diagnosis performed?

The HIV tests that are in use today can detect infection as early as one to two weeks after the person became infected. If more than six weeks have passed since you may have been exposed to infection, in more than 90 per cent of cases, you can rely on a negative test result, i.e. that you do not have HIV. If you have been in a high-risk situation, i.e. had unprotected sex with a known HIV-infected person who is not currently undergoing treatment, you should also take a further test after three months.

Some clinics are using rapid HIV tests. Although the HIV tests that are routinely used are very reliable, they can sometimes produce false positive results. A false positive test means that the test detects substances in the blood other than HIV. All samples that give a positive result in the first HIV test will therefore be tested again using a different test method, Western Blot, which gives final confirmation that the test is actually positive. As an extra precaution, another blood sample can be taken to rule out the possibility that the test tubes have been accidentally swapped over.

A positive HIV test indicates that a person is infected with HIV, but it provides no information about when or how the person was infected. Nor can the test say anything about how far the disease has progressed.


​All patients with recently diagnosed HIV infection should be placed on infection medications as soon as possible. Antiviral treatment has been shown to reduce the risk of severe complicating illnesses or death, even in the case of high CD4 counts. It is therefore recommended that treatment be started as soon as possible, regardless of the CD4 cell count, partly out of consideration for the infected person's own health, and partly to prevent further transmission.  

How is the diagnosis performed?

Hivtestene som brukes i dag kan påvise smitte så tidlig som 1–2 uker etter at man har blitt smittet. Hvis det er gått mer enn 6 uker siden man kan ha utsatt seg for smitte, kan man i over 90 prosent av tilfellene stole på et negativt testresultat, det vil si at man ikke har hiv. Hvis man har vært i en høyrisikosituasjon, det vil si hatt ubeskyttet sex med en kjent hivsmittet som ikke er på behandling, bør man i tillegg ta en ny prøve etter 3 måneder.

Hurtigtester for hiv er i bruk ved enkelte klinikker. Selv om de hivtestene som brukes rutinemessig er meget pålitelige, kan disse av og til være falsk positive. En falsk positiv test betyr at testen slår ut på andre stoffer i blodet enn hiv. Alle prøver som gir positivt utslag i den første hivtesten vil derfor bli undersøkt med en annen test, Western Blot, som gir en endelig bekreftelse på at testen er positiv. Som en ekstra sikkerhet tas en ny blodprøve for å utelukke at det ikke har skjedd en forbytting av prøveglassene.

En positiv hivtest forteller at en person er smittet med hiv, men den gir ingen opplysninger om når eller hvordan personen er smittet. Testen kan heller ikke si noe om hvor langt sykdommen er kommet.


​Alle pasienter med nyoppdaget hivinfeksjon skal så snart som mulig henvises til infeksjonsmedisiner. Antiviral behandling er vist å redusere risikoen for alvorlig kompliserende sykdom eller død selv ved høye CD4-tall. Det anbefales derfor å starte behandling så tidlig som mulig, uavhengig av CD4-tall, dels av hensyn til den smittedes egen helse, dels for å hindre videre smitteoverføring.

Preventive measures against HIV infection


The main mode of transmission is through sexual contact where one of the partners is infected. The most important preventive measure is therefore to use condoms during both vaginal and anal intercourse and oral sex.HIV is very rarely transmitted through oral sex, but the current situation with the occurrence of other sexually transmitted infections such as gonorrhoea and syphilis suggests that condoms should be used for oral sex by people in groups that are vulnerable to HIV. 

Syringes and blood spills

Clean drug paraphernalia must be used by anyone who injects drugs, and they must never be shared with others. When removing blood spills, ordinary household chlorine should be used.


Preventive treatment after exposure to infection is available and is known as PEP. If you have been exposed to a risk of HIV infection, this risk can be reduced by immediately starting treatment with viral medicines for HIV. Treatment normally lasts for four weeks.

PEP can be used when other preventive measures have failed or in the event of an unexpected event, such as a condom splitting. PEP should be initiated as soon as possible if there is an indication for such treatment – preferably within 4 hours and within no more than 72 hours after the high-risk situation occurred. It is therefore important that you contact your doctor/out-of-hours medical service immediately if you would like PEP.


Studies have shown that medicine used in the treatment of HIV-positive patients can also prevent HIV infection if the medicine is taken before a possible infection situation occurs. This is called Pre-Exposure Prophylaxis (PrEP). In recent years, numerous studies have shown that PrEP provides good protection against the transmission of HIV infection. PrEP does not provide a 100-percent guarantee against HIV infection, nor does it provide any protection against other sexually transmitted infections. It must therefore be considered as a supplement to other preventive measures (consistent use of condoms, frequent testing and treatment of sexually transmitted infections).

It is therefore recommended that PrEP be used in addition to condoms, regular testing and treatment of sexually transmitted infections. PrEP can be used in one of two ways: tablets taken either daily (continuously) or as and when necessary (intermittently).

To be considered for PrEP, you must be HIV-negative and at a high risk of becoming infected. In practice, this means that the programme is primarily of relevance to men who have sex with other men and transgender persons who have had unprotected anal intercourse with several partners during the last twelve months or where there is a high probability of recurrence. Having a sexually transmitted infection or needing PEP during the past 12 months, having sex while intoxicated, or having a minority background and/or sex with men or transgender persons abroad are all factors which strengthen the recommendation to use PrEP.

PrEP is available at sexually transmitted infection outpatient clinics and infectious disease departments across the country. Your GP can refer you for assessment if you would like PrEP.


Efforts to develop an effective preventive vaccine have been continuing for many years, and a number of vaccines are currently being tested. So far, it has not been possible to produce a vaccine with an infection prevention effect.

The HIV situation in Norway

After having been very stable during the 1990s, the number of confirmed cases of HIV rose during the early 2000s. This was primarily due to the presence of more HIV-positive immigrants who had been infected in their former home country before arriving in Norway, as well as a significant increase in infection rates among men who have sex with other men. Since 2015, there has been a decline in reported cases among men who have sex with other men, probably due to the effect of numerous measures such as increased testing, rapid commencement of treatment and access to preventive treatment (PrEP). Reported cases among newly arrived asylum seekers have also fallen in recent years, particularly during the pandemic in 2020 and 2021, which is due to a decline in the number of asylum seekers. The war in Ukraine has led to a large influx of refugees. About 100 HIV-positive people were detected among such people in 2022, most of whom were known to be HIV-positive from their home country and undergoing treatment.

Immigrants make up about two-thirds of those who have been diagnosed with HIV infection in Norway over the last 10 years. Most of them come from conflict areas in central and eastern Africa, as well as Southeast Asia. Heterosexual transmission among persons resident in Norway is still relatively rare. Most of this group are men who have been infected abroad, especially in Thailand. There is little new infection among people who take drugs using syringes in Norway.

At the end of 2022, a total of 7,125 HIV-positive people had been diagnosed in Norway (4,785 men and 2,340 women). It is estimated that in 2022 about 4,800 people were living with HIV in Norway.

The global HIV situation

HIV infection has been detected in every country of the world. UNAIDS estimates that, at the end of 2021, there were approximately 38 million people living with HIV infection. Approximately 26 million of these have access to antiviral treatment. Since the start of the epidemic, it is estimated that approximately 78 million people have been infected with HIV, and approximately 35 million people have died from AIDS-related diseases (2021).  

Living with HIV


HivNorge is a party-politically and religiously independent national interest organization for people living with HIV, relatives and others affected or preoccupied with HIV.

Folkehelseinstituttet. Hivinfeksjon/Aids - veileder for helsepersonell. Oslo: 2019 [hentet 2019-02-25]. Tilgjengelig fra:

Norsk forening for infeksjonsmedisin. Faglige retningslinjer for oppfølging og behandling av hiv. Oslo: 2018 [hentet 2019-02-25]. Tilgjengelig fra:

Content provided by Norwegian Institute of Public Health

Norwegian Institute of Public Health. Om hiv og aids. [Internet]. Oslo: The Directorate of e-health; updated Thursday, July 6, 2023 [retrieved Thursday, December 7, 2023]. Available from:

Last updated Thursday, July 6, 2023