# Does antiretroviral therapy (ART) prevent all opportunistic infections in HIV patients?

Canonical page: https://clinicsjo.com/en/faq/does-antiretroviral-therapy-art-prevent-all-opportunistic-infections-in-hiv-patients
Language: en
Category: infectious
Publisher: ClinicsJo
Published: 2026-09-13T17:52:51.338Z
Content updated: 2026-09-13T17:52:51.338Z
Translation (ar): https://clinicsjo.com/ar/faq/does-antiretroviral-therapy-art-prevent-all-opportunistic-infections-in-hiv-patients

Antiretroviral therapy (ART) does not prevent all opportunistic infections in patients with HIV, but it significantly reduces the risk of developing them by strengthening the immune system. People who receive effective ART are less likely to develop serious opportunistic infections compared to those who do not receive treatment or whose treatment is not working correctly [\[1\]](<https://clinicsjo.com/en/faq/does-antiretroviral-therapy-art-prevent-all-opportunistic-infections-in-hiv-patients#source-S1>).

Opportunistic infections occur when HIV weakens the immune system, making the body susceptible to infections that are less common or less severe in healthy individuals. Although ART is the first line of defense, some infections may still occur, especially if the immune system is severely weakened or if treatment adherence is not maintained [\[1\]](<https://clinicsjo.com/en/faq/does-antiretroviral-therapy-art-prevent-all-opportunistic-infections-in-hiv-patients#source-S1>).

## How does antiretroviral therapy reduce risks?

Antiretroviral therapy (ART) works by reducing the HIV viral load in the body, allowing the immune system to regain strength and increase CD4 cell counts. These cells are essential for fighting infections. When the viral load is suppressed and the CD4 count is high, the body is better able to resist pathogens that cause opportunistic infections [\[3\]](<https://clinicsjo.com/en/faq/does-antiretroviral-therapy-art-prevent-all-opportunistic-infections-in-hiv-patients#source-S3>). Effective HIV medications have led to a significant decrease in the prevalence of opportunistic infections [\[1\]](<https://clinicsjo.com/en/faq/does-antiretroviral-therapy-art-prevent-all-opportunistic-infections-in-hiv-patients#source-S1>).

## Infections that may continue to occur

Despite the effectiveness of ART, some HIV patients may still develop opportunistic infections for various reasons. This may include not knowing they have the virus and therefore not receiving treatment, not adhering to treatment, or their treatment not responding effectively [\[1\]](<https://clinicsjo.com/en/faq/does-antiretroviral-therapy-art-prevent-all-opportunistic-infections-in-hiv-patients#source-S1>). For example, people with HIV remain at a higher risk of serious complications associated with influenza, especially if they have a very low CD4 count or are not taking ART [\[3\]](<https://clinicsjo.com/en/faq/does-antiretroviral-therapy-art-prevent-all-opportunistic-infections-in-hiv-patients#source-S3>). Fungal infections such as cryptococcosis, a serious fungal infection, also remain a threat, particularly in people with weakened immune systems [\[2\]](<https://clinicsjo.com/en/faq/does-antiretroviral-therapy-art-prevent-all-opportunistic-infections-in-hiv-patients#source-S2>).

## Additional preventive measures

In addition to taking antiretroviral therapy regularly, there are other steps that can be taken to help prevent opportunistic infections. These steps include avoiding exposure to contaminated food and water, such as undercooked eggs or unpasteurized dairy products [\[1\]](<https://clinicsjo.com/en/faq/does-antiretroviral-therapy-art-prevent-all-opportunistic-infections-in-hiv-patients#source-S1>). It is also important to talk with a healthcare provider about vaccines and preventive medications that can prevent certain opportunistic infections, such as the annual flu vaccine and the pneumococcal vaccine [\[3\]](<https://clinicsjo.com/en/faq/does-antiretroviral-therapy-art-prevent-all-opportunistic-infections-in-hiv-patients#source-S3>). HIV patients should avoid the nasal spray flu vaccine, as it contains a weakened form of live influenza virus and is not recommended for people with weakened immune systems [\[3\]](<https://clinicsjo.com/en/faq/does-antiretroviral-therapy-art-prevent-all-opportunistic-infections-in-hiv-patients#source-S3>).

For more information about opportunistic infections and their prevention, you can visit [Opportunistic Infections in HIV Patients: Prevention and Treatment (Arabic)](<https://clinicsjo.com/ar/articles/opportunistic-infections-hiv-prevention-treatment>).

## When should you call a doctor?

If you have HIV and develop symptoms that suggest an infection, such as fever, cough, shortness of breath, severe headache, stiff neck, nausea, vomiting, or a rash, it is essential to contact a healthcare provider immediately. These symptoms can be signs of an opportunistic infection that requires immediate treatment. For example, the Centers for Disease Control and Prevention (CDC) recommends immediate antiviral treatment for influenza for people with HIV who have symptoms of the flu or are suspected of having it, preferably within two days of symptom onset [\[3\]](<https://clinicsjo.com/en/faq/does-antiretroviral-therapy-art-prevent-all-opportunistic-infections-in-hiv-patients#source-S3>).

## Medical references

- [HIV and Infections](<https://medlineplus.gov/hivandinfections.html>)

- [Flu and People with HIV](<https://www.cdc.gov/flu/highrisk/hiv.html>)

- [Cryptococcosis](<https://medlineplus.gov/ency/article/001328.htm>)

General health education; not a substitute for individualized clinical assessment.

Citation URL: https://clinicsjo.com/en/faq/does-antiretroviral-therapy-art-prevent-all-opportunistic-infections-in-hiv-patients#answer