Quiz (Retroviruses)
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Transcript of Quiz (Retroviruses)
Yusri Arif bin Sapaee
5th Year Medical Student
Kasr El-Ainy School of Medicine, Cairo University
Classification of retroviruses that cause
disease in humans
Structure of the human
immunodeficiency virus
HIV proviral genome
Binding of HIV to surface of lymphocyte
Attachment and entry of HIV virus
The H
IV r
eplicati
on c
ycle
Common modes of transmission of HIV
Typical time course of HIV infection
Pathogenesis of HIV
Pattern of opportunistic infections
associated with declining CD4+ cell
counts
Highly active antiretroviral therapy
(HAART)
Retroviruses are non enveloped positive
sense ssRNA viruses
Retroviruses contain enzyme reverse
transcriptase
Retroviruses rely on the reverse
transcriptase (RT) enzyme to transcribe
their genome from RNA into a DNA
copy, which can then be integrated as a
DNA provirus into the genomic DNA of
the host cell.
Important members of Retroviridae family
that affect humans are?
HIV Lentivirinae subfamily
HTLV Oncovirinae subfamily
Human Immunodeficiency Viruses replicate
in?
HIV-2 is the major cause of AIDS worldwide
HIV-2 is characterized by the
following EXCEPT:
First described in 1986
Slower in progression
Limited mostly to West Africa and Portugal
Much less severe
Has 2 groups (M & O)
Group M viruses are rare and limited to
western part of Africa
HIV-1 and HIV-2 resemble each other
strikingly. However, they differ in?
The virus has spherical shape with a
diameter of 100nm.
The virus envelope is line with an HIV
protein called p17 (matrix protein, MA).
Inside, a conical-shaped capsid (CA) made of
protein called p24 (core antigen)
What is the most abundant protein in the
virus particle?
Envelope antigens
Core capsid antigens
RT antigen
Its absence successful tx
Responsible for receptor binding
gp120
p66/51 complex
gp120 (SU) & gp41 (TM)
p17 and p24
p24
HIV antigens
Cells that are not infected by HIV
Monocytes/macrophages
Follicular dendritic cells (FDCs)
CD4+ T helper lymphocytes
Oligodendrocytes, astrocytes, neurones and glial cells
Hepatocytes
Name receptors on the cell surface
required for the entry of HIV into the cell
First
Second
Third
Forth
Fifth
Assembly and budding
Transcription
Reverse transcription
Integration
Translation
Post-fusion events
HIV antibody positive
HIV antibody negative, HIV RNA detectable
HIV antibody negative, HIV RNA viral load >5000 copies/ml
HIV antibody negative, HIV RNA viral load 50-5000 copies/ml
HIV antibody negative, HIV RNA viral load <50 copies/ml
Not infected
Acute HIV infection
Established HIV infection & no acute infection
Repeat HIV RNA test in the same specimen
Indeterminate repeat testing on follow up specimen
Diagnosis of acute HIV infection
(acute retroviral syndrome)
How to diagnose HIV infection in newborns?
Nucleoside analogues transcriptase inhibitors
Non-nucleoside analogues transcriptase inhibitors
Protease inhibitors
Protease inhibitors
Fusion inhibitors
Enfuvirtide (Fuzeon)
Ritonavir
Lamivudine
Nevirapine
Indinavir
Highly active antiretroviral therapy
(HAART)
How to monitor anti-HIV therapy?
Best regimen for post-exposure
chemoprophylaxis
1 reverse transcriptase inhibitor + 2 protease inhibitor
1 reverse transcriptase inhibitor + 1 protease inhibitor
2 fusion inhibitors + 1 protease inhibitor
1 reverse transcriptase inhibitor + 2 fusion inhibitors
2 reverse transcriptase inhibitors + 1 protease inhibitor