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Retrovirus Life Cycles01:10

Retrovirus Life Cycles

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Retroviruses have a single-stranded RNA genome that undergoes a special form of replication. Once the retrovirus has entered the host cell, an enzyme called reverse transcriptase synthesizes double-stranded DNA from the retroviral RNA genome. This DNA copy of the genome is then integrated into the host’s genome inside the nucleus via an enzyme called integrase. Consequently, the retroviral genome is transcribed into RNA whenever the host’s genome is transcribed, allowing the...
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Sexually transmitted infections (STIs) are diseases transmitted primarily through unsafe sexual interactions. Bacteria, viruses, or parasites cause them and can result in severe health complications if untreated.ChlamydiaThe bacterium Chlamydia trachomatis is responsible for the disease Chlamydia, the most common STI in the United States. This peculiar pathogen requires human cells to reproduce, residing intracellularly. The initial infection often goes unnoticed because it typically does not...
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Transmission-based Precautions II: Airborne and Protective Environment01:25

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Transmission-based precautions are for patients infected or suspected to be infected (or colonized) with organisms posing a significant risk to others. The transmission precautions include airborne and protective environment precautions.
Airborne precautions:
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Standard precautions are the minimum infection control safeguards used while caring for all patients, irrespective of their disease condition. They help prevent the spread of common infectious microorganisms to healthcare workers, patients, and visitors in all healthcare settings.
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Transmission-based Precautions I: Contact, Enteric, and Droplets01:17

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Transmission-based precautions are for patients known to be infected or suspected to be infected or colonized with organisms that pose a significant risk to others. Some transmission-based precautions include contact, enteric, and droplet.
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In pediatric medicine, understanding the renal function and drug elimination nuances is crucial for administering safe and effective treatments. Newborns, in particular, display markedly slower renal functions than adults, profoundly affecting how drugs are cleared from their bodies. This slower drug clearance requires clinicians to extend the dosing intervals for many medications to prevent drug accumulation and toxicity while ensuring therapeutic efficacy.One key area where these adjustments...
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Related Experiment Video

Updated: Nov 24, 2025

An Affordable HIV-1 Drug Resistance Monitoring Method for Resource Limited Settings
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Prescribing pre-exposure prophylaxis for HIV.

Mark Bloch

    Australian Prescriber
    |December 28, 2020
    PubMed
    Summary

    Pre-exposure prophylaxis with tenofovir disoproxil plus emtricitabine is effective for HIV prevention in high-risk groups. Daily medication requires regular monitoring for adherence, safety, and potential kidney or bone density issues.

    Area of Science:

    • Infectious Diseases
    • Pharmacology
    • Public Health

    Background:

    • HIV remains a significant global health concern.
    • Pre-exposure prophylaxis (PrEP) offers a biomedical strategy for HIV prevention.
    • Co-formulated tenofovir disoproxil plus emtricitabine is a widely used PrEP medication.

    Purpose of the Study:

    • To evaluate the effectiveness of co-formulated tenofovir disoproxil plus emtricitabine for HIV pre-exposure prophylaxis.
    • To identify suitable populations and administration guidelines for PrEP.
    • To outline monitoring requirements for PrEP efficacy and safety.

    Main Methods:

    • The study reviews the efficacy of daily oral tenofovir disoproxil plus emtricitabine.
    • It assesses suitability for men who have sex with men, heterosexual individuals, and intravenous drug users at risk of HIV.
    Keywords:
    HIV preventionemtricitabinehuman immunodeficiency virusmen who have sex with menpre-exposure prophylaxistenofovir

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  • Guidelines for prescription and monitoring through the Pharmaceutical Benefits Scheme are discussed.

    • Main Results:

    • Co-formulated tenofovir disoproxil plus emtricitabine demonstrates high effectiveness in preventing HIV.
    • The medication is appropriate for diverse high-risk populations.
    • A three-monthly program with regular monitoring is recommended for optimal outcomes.

    Conclusions:

    • Daily PrEP with tenofovir disoproxil plus emtricitabine is a highly effective HIV prevention strategy.
    • It is accessible via the Pharmaceutical Benefits Scheme and manageable by various healthcare providers.
    • While well-tolerated, ongoing monitoring for kidney toxicity and bone density is crucial.