About Human Immunodeficiency Virus Infection

Overview

Human immunodeficiency virus infection (HIV) is a viral infection that attacks the immune system. It is caused by the human immunodeficiency virus (HIV-1) and can lead to acquired immunodeficiency syndrome (AIDS). HIV is transmitted through contact with certain bodily fluids, such as blood, semen, vaginal fluids, and breast milk. Common modes of transmission include unprotected sex, sharing needles, and mother-to-child transmission during pregnancy, childbirth, or breastfeeding.

HIV primarily targets CD4+ T lymphocytes, which are a type of white blood cell involved in immune response. The virus destroys these cells, leading to a weakened immune system. As a result, individuals with HIV are more susceptible to infections and diseases that their immune system would normally be able to fight off.

It's important to note that not everyone who has HIV will progress to AIDS. With early diagnosis and appropriate medical care, people living with HIV can manage their condition and live long and healthy lives. Treatment for HIV involves antiretroviral therapy (ART), which helps suppress the virus and slow down the progression of the disease.

Causes and Risk Factors

The primary mode of transmission of human immunodeficiency virus is through unprotected sexual contact with an infected individual. This includes vaginal, anal, or oral sex without the use of barrier methods such as condoms. Other causes of HIV infection include sharing needles or syringes with an infected person, receiving contaminated blood transfusions or organ transplants, and transmission from an infected mother to her baby during pregnancy, childbirth, or breastfeeding.

Non-modifiable risk factors for HIV cannot be changed or controlled. These include:

Age: While anyone can contract HIV, certain age groups may be at a higher risk. Young adults and adolescents are particularly vulnerable due to engaging in risky behaviors and having less knowledge about prevention methods.
Gender: HIV affects people of all genders, but certain biological and societal factors may increase the risk for different groups. For example, biological factors such as vaginal tissue being more susceptible to infection can put cisgender women at a higher risk.
Race/ethnicity: Certain racial and ethnic groups, such as Black and Latinx communities, have higher rates of HIV infection compared to other groups. This can be influenced by various social determinants of health, including limited access to healthcare and higher rates of poverty.

Modifiable risk factors for HIV can be influenced or changed. These include:

Unsafe sexual practices: Engaging in unprotected sexual activities without using barrier methods like condoms increases the risk of HIV transmission. Practicing safe sex by consistently using condoms and getting tested regularly can help reduce this risk.
Sharing needles: Sharing needles or syringes for drug use or other purposes can lead to HIV transmission. Using clean needles and syringes or opting for safer alternatives like needle exchange programs can greatly reduce this risk.
Lack of education: A lack of knowledge about HIV prevention methods and misconceptions about the virus can contribute to higher rates of infection. Educating oneself about HIV transmission and prevention is crucial in reducing the risk.
Substance abuse: Substance abuse, especially injection drug use, increases the likelihood of engaging in risky behaviors that can lead to HIV transmission. Seeking help for substance abuse issues can significantly lower the risk.

Symptoms

Early symptoms of human immunodeficiency virus infection can vary from person to person. Some common early symptoms include:

Sore throat
Muscle aches
Fever
Weight loss
Fatigue
Rash
Swollen lymph nodes in the neck or groin
Gastrointestinal issues like diarrhea or vomiting

These symptoms can resemble a flu-like illness and may last for a few weeks.

As HIV infection progresses to later stages or higher severity, additional symptoms may occur. These can include:

Persistent or recurrent infections such as respiratory infections (e.g., pneumonia)
Skin infections
Oral thrush (a fungal infection in the mouth)
Genital/anal yeast infections

People with advanced HIV infection may also experience:

Chronic diarrhea
Night sweats
Unexplained fatigue
Persistent fever
Unintended weight loss
Neurological symptoms like memory loss or confusion

It's important to note that not everyone with HIV will experience the same symptoms or at the same time. Some individuals may have no symptoms at all for many years while still being infected with HIV. Regular testing is crucial to detect HIV infection early and start appropriate treatment if necessary.

Diagnosis

To diagnose human immunodeficiency virus infection, healthcare providers commonly perform the following examinations, tests, and procedures:

HIV antibody screening: This is the most important method for diagnosing HIV infection. It involves detecting the presence of antibodies against HIV in the blood. Screening tests, such as enzyme-linked immunosorbent assays (ELISAs), chemiluminescence assays, and rapid detection tests, are used to identify potential HIV-infected individuals.
Confirmatory tests: If the screening test is positive, confirmatory tests are performed to validate the diagnosis. These tests include Western blot or immunofluorescence assays, which further confirm the presence of HIV antibodies.
Viral load testing: This test measures the amount of HIV RNA in the blood. It helps determine how actively the virus is replicating and provides information about disease progression and treatment effectiveness.
CD4+ T-cell count: CD4+ T-cells are a type of white blood cell that helps the immune system fight infections. A CD4+ T-cell count measures the number of these cells in the blood. It is an important indicator of immune function and helps determine when to start antiretroviral therapy (ART).

In addition to diagnosing HIV infection, healthcare providers may perform further examinations and tests to determine the severity of the infection. These may include:

Baseline laboratory tests: These tests assess overall health and check for any associated conditions or complications.
Resistance testing: This test identifies specific mutations in the virus that may affect treatment options.
Genotypic testing: This test determines the genetic makeup of the virus, which helps guide treatment decisions.
Imaging studies: Doctors may recommend imaging studies like X-rays or CT (computed tomography) scans to evaluate any complications or opportunistic infections associated with advanced HIV infection.

It's important to note that these examinations, tests, and procedures should be performed by healthcare professionals who specialize in HIV care. They can provide accurate diagnoses and determine appropriate treatment plans based on individual circumstances.

Treatment Options

The goals of treatment for human immunodeficiency virus infection are to achieve and maintain viral suppression, improve the immune system's function, prevent the progression of HIV to acquired immunodeficiency syndrome (AIDS), and reduce the risk of transmitting the virus to others.

To achieve these goals, healthcare providers may recommend a combination of medications, therapeutic procedures, lifestyle behavior changes, and other treatments. Recommended treatment approaches include:

Antiretroviral therapy (ART): ART is recommended for people with HIV and should be started as soon as possible after diagnosis. ART involves taking a combination of antiretroviral medications daily. These medications work by suppressing the replication of the HIV virus in the body. By reducing the amount of virus in the blood (viral load), ART helps to maintain viral suppression and prevent HIV-related complications. There are several classes of ART medications that work against HIV in different ways to hinder its replication. These include:
- Nucleoside reverse transcriptase inhibitors (NRTIs)
- Non-nucleoside reverse transcriptase inhibitors (NNRTIs)
- Protease inhibitors (PRs)
- Integrase strand transfer inhibitors (INSTIs, also called integrase inhibitors)
- Fusion inhibitors
- CCR5 antagonists
- Attachment inhibitors
- Capsid inhibitors
Pre-exposure prophylaxis (PrEP): PrEP is a medication taken by people who are at high risk of contracting HIV but are currently HIV-negative. It involves taking a daily pill containing two antiretroviral drugs to reduce the risk of acquiring HIV from sexual or injection drug use exposures.
Post-exposure prophylaxis (PEP): PEP is a short-term treatment taken after a potential exposure to HIV (such as through unprotected sex or needle-sharing). It involves taking a combination of antiretroviral drugs within 72 hours of exposure to reduce the risk of infection.
Vaccinations: Vaccinations help prevent infections that can be more severe in people with HIV. Vaccines such as influenza, pneumococcal, COVID, and hepatitis A and B vaccines are recommended for individuals with HIV.
Mental health support: Living with HIV can have emotional and psychological challenges. Mental health support, including counseling or therapy, can help individuals cope with stress, anxiety, depression, or other mental health issues.
Supportive care: Supportive care involves managing symptoms and complications related to HIV infection or its treatment. This may include medications for opportunistic infections (illnesses that happen when the immune system is too weak to fight them off), pain management, nutritional support, or physical therapy.
Lifestyle behavior changes: Adopting healthy lifestyle behaviors can positively impact overall health and well-being for individuals with HIV. These may include regular exercise, a balanced diet, adequate sleep, stress reduction techniques, smoking cessation, and limiting alcohol or drug use.

It's important to note that treatment plans may vary depending on individual needs and circumstances. Healthcare providers will work closely with individuals living with HIV to develop personalized treatment plans that address their specific goals and health concerns.

Medication dosing may be affected by many factors. Check with your health care professional about dosing for your individual situation. Side effects can occur. Check with your health care professional or read the information provided with your medication for side effect information.

Progression or Complications

The natural progression of human immunodeficiency virus (HIV) infection can vary from person to person. However, without treatment, HIV typically progresses through several stages over time.

In the early stage of infection, known as acute or primary infection, individuals may experience flu-like symptoms such as fever, fatigue, sore throat, and swollen lymph nodes. During this stage, the virus replicates rapidly in the body and can be easily transmitted to others.
After the acute stage, HIV enters a phase called clinical latency or asymptomatic stage. During this phase, which can last for many years, the virus continues to replicate at a lower level. People with HIV may not experience any symptoms during this time, but the virus is still active and can be transmitted to others.

Without treatment, HIV can progress to a more advanced stage known as acquired immunodeficiency syndrome (AIDS). AIDS is characterized by severe damage to the immune system, leaving individuals vulnerable to opportunistic infections and certain types of cancers. Common complications that can occur with HIV infection include:

Opportunistic infections: These are infections caused by organisms that do not typically cause illness in people with healthy immune systems. Examples include pneumonia caused by Pneumocystis jirovecii and tuberculosis.
AIDS-defining cancers: Certain types of cancers are more common in people with advanced HIV infection. These include Kaposi sarcoma, non-Hodgkin lymphoma, and cervical cancer.
Neurological complications: HIV can affect the central nervous system and lead to conditions such as HIV-associated neurocognitive disorders (HAND), peripheral neuropathy, and meningitis.
Hematologic abnormalities: HIV can cause abnormalities in blood cell counts, including anemia (low red blood cell count), leukopenia (low white blood cell count), lymphopenia (low lymphocyte count), and thrombocytopenia (low platelet count).
Rheumatological manifestations: Some individuals with HIV may experience rheumatological complications such as arthralgias/arthritis, myositis, osteonecrosis, osteoporosis, septic arthritis, and connective tissue diseases.

If you have been diagnosed with HIV or have concerns about your health, it is essential to consult a healthcare professional who specializes in HIV care for guidance on appropriate treatment options and management strategies.