Cytomegalovirus (CMV) retinitis is a sight-threatening opportunistic infection of the retina caused by reactivation of latent cytomegalovirus in immunocompromised hosts, most classically people with advanced HIV/AIDS and low CD4 counts, as well as transplant and immunosuppressed patients. Productive CMV infection produces a progressive, full-thickness necrotizing retinitis that can rapidly lead to retinal detachment and irreversible blindness if untreated. It is historically notable as the indication for fomivirsen, the first antisense oligonucleotide drug ever approved by the FDA (1998).
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name: Cytomegalovirus Retinitis
creation_date: '2026-05-30T12:00:00Z'
description: >-
Cytomegalovirus (CMV) retinitis is a sight-threatening opportunistic infection
of the retina caused by reactivation of latent cytomegalovirus in
immunocompromised hosts, most classically people with advanced HIV/AIDS and
low CD4 counts, as well as transplant and immunosuppressed patients. Productive
CMV infection produces a progressive, full-thickness necrotizing retinitis that
can rapidly lead to retinal detachment and irreversible blindness if untreated.
It is historically notable as the indication for fomivirsen, the first antisense
oligonucleotide drug ever approved by the FDA (1998).
category: Infectious Disease
disease_term:
preferred_term: cytomegalovirus retinitis
term:
id: MONDO:0000878
label: cytomegalovirus retinitis
parents:
- Cytomegalovirus infection
- Viral eye infection
- Opportunistic infection
infectious_agent:
- name: Human cytomegalovirus
description: >-
Human cytomegalovirus (HCMV, human betaherpesvirus 5) is a ubiquitous
betaherpesvirus that establishes lifelong latency after primary infection and
reactivates to cause end-organ disease, including retinitis, when host cellular
immunity is impaired.
evidence:
- reference: PMID:11294581
reference_title: Laboratory diagnosis of cytomegalovirus (CMV) infections in immunodepressed patients, mainly in patients with AIDS.
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
An important proportion of immunodepressed patients are latent carriers of
the virus, and under these conditions, the lack of cellular immunity
predisposes the patient to an active infection in which the virus is
replicating.
explanation: Establishes that CMV persists latently and reactivates to active replication when cellular immunity is lost.
pathophysiology:
- name: CMV reactivation under impaired cellular immunity
description: >-
In hosts with deficient CD4+ T-cell-mediated immunity (advanced HIV/AIDS,
transplant recipients, or other iatrogenic immunosuppression), latent
cytomegalovirus escapes immune control and resumes active replication. Loss of
protective cellular immunity is the proximal permissive event for end-organ CMV
disease.
downstream:
- target: Productive CMV infection of the retina
description: Reactivated, replicating virus disseminates and seeds the retina.
cell_types:
- preferred_term: CD4-positive T cell
term:
id: CL:0000624
label: CD4-positive, alpha-beta T cell
modifier: DECREASED
biological_processes:
- preferred_term: adaptive immune response
modifier: DECREASED
term:
id: GO:0002250
label: adaptive immune response
- preferred_term: viral genome replication
modifier: INCREASED
term:
id: GO:0019079
label: viral genome replication
evidence:
- reference: PMID:11294581
reference_title: Laboratory diagnosis of cytomegalovirus (CMV) infections in immunodepressed patients, mainly in patients with AIDS.
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
An important proportion of immunodepressed patients are latent carriers of
the virus, and under these conditions, the lack of cellular immunity
predisposes the patient to an active infection in which the virus is
replicating.
explanation: Directly links loss of cellular immunity to reactivation and active CMV replication.
- name: Productive CMV infection of the retina
description: >-
Replicating cytomegalovirus reaches the eye and productively infects retinal
cells. In profoundly immunosuppressed HIV-positive patients, the retina is one
of the most characteristic sites of CMV end-organ disease.
downstream:
- target: Full-thickness necrotizing retinitis
description: Cytopathic viral infection drives inflammation and retinal cell destruction.
cell_types:
- preferred_term: retinal pigment epithelial cell
term:
id: CL:0002586
label: retinal pigment epithelial cell
- preferred_term: photoreceptor cell
term:
id: CL:0000210
label: photoreceptor cell
biological_processes:
- preferred_term: viral process
modifier: INCREASED
term:
id: GO:0016032
label: viral process
evidence:
- reference: PMID:11294581
reference_title: Laboratory diagnosis of cytomegalovirus (CMV) infections in immunodepressed patients, mainly in patients with AIDS.
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
In HIV-positive patients, CMVD tends to manifest itself as retinitis and
involvement of the gastrointestinal tract.
explanation: Supports the retina as a principal site of CMV end-organ disease in HIV-positive patients.
- name: Full-thickness necrotizing retinitis
description: >-
Productive retinal CMV infection produces a progressive, full-thickness
necrotizing retinitis with characteristic yellow-white retinal opacification
and associated hemorrhage. Untreated, it advances centrifugally and can rapidly
destroy the retina, leading to blindness.
downstream:
- target: Immune recovery uveitis
description: Restoration of immunity in a retina bearing prior CMV antigen can trigger paradoxical intraocular inflammation.
biological_processes:
- preferred_term: cell death
modifier: INCREASED
term:
id: GO:0008219
label: cell death
- preferred_term: inflammatory response
modifier: INCREASED
term:
id: GO:0006954
label: inflammatory response
evidence:
- reference: PMID:12768225
reference_title: Fomivirsen.
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
Cytomegalovirus (CMV) retinitis can rapidly lead to blindness in patients
with acquired immune deficiency syndrome (AIDS).
explanation: Supports rapid progression of CMV retinitis to blindness in AIDS.
- name: Immune recovery uveitis
description: >-
When cellular immunity is restored, most often after initiation of
antiretroviral therapy in HIV/AIDS, a paradoxical intraocular inflammatory
reaction can develop in eyes with prior CMV retinitis. This immune recovery
uveitis is an important cause of visual morbidity despite control of the
underlying viral infection.
biological_processes:
- preferred_term: adaptive immune response
modifier: INCREASED
term:
id: GO:0002250
label: adaptive immune response
- preferred_term: inflammatory response
modifier: INCREASED
term:
id: GO:0006954
label: inflammatory response
evidence:
- reference: PMID:39046420
reference_title: "Immune recovery uveitis: an ocular manifestation in HIV/AIDS receiving treatment."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
It is a paradoxical reaction that is frequently associated with a prior
cytomegalovirus retinitis infection.
explanation: Supports immune recovery uveitis as a paradoxical inflammatory sequela of prior CMV retinitis.
phenotypes:
- category: Ophthalmological
name: Retinitis
description: Necrotizing inflammation of the retina is the defining feature of the disease.
phenotype_term:
preferred_term: Retinitis
term:
id: HP:0032118
label: Retinitis
evidence:
- reference: PMID:11294581
reference_title: Laboratory diagnosis of cytomegalovirus (CMV) infections in immunodepressed patients, mainly in patients with AIDS.
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
In HIV-positive patients, CMVD tends to manifest itself as retinitis and
involvement of the gastrointestinal tract.
explanation: Supports retinitis as the characteristic ocular manifestation of CMV in HIV-positive patients.
- category: Ophthalmological
name: Yellow-white retinal lesions
description: >-
CMV retinitis classically appears as yellow-white areas of retinal necrosis,
often with associated retinal hemorrhage, spreading along the vascular arcades.
phenotype_term:
preferred_term: Yellow-white retinal lesions
term:
id: HP:0030506
label: Yellow/white retinal lesion
- category: Ophthalmological
name: Visual impairment
description: Retinal destruction reduces visual acuity, which often does not fully recover even with treatment.
phenotype_term:
preferred_term: Visual impairment
term:
id: HP:0000505
label: Visual impairment
- category: Ophthalmological
name: Vitreous floaters
description: Floaters are a common presenting symptom reflecting vitreous inflammatory debris.
phenotype_term:
preferred_term: Vitreous floaters
term:
id: HP:0100832
label: Vitreous floaters
- category: Ophthalmological
name: Scotoma
description: Areas of retinal necrosis produce corresponding visual field defects.
phenotype_term:
preferred_term: Scotoma
term:
id: HP:0000575
label: Scotoma
- category: Ophthalmological
name: Retinal detachment
description: >-
Necrotic, atrophic retina is prone to breaks, and rhegmatogenous retinal
detachment is a major sight-threatening late complication of CMV retinitis.
phenotype_term:
preferred_term: Retinal detachment
term:
id: HP:0000541
label: Retinal detachment
- category: Ophthalmological
name: Blindness
description: Untreated or progressive disease can rapidly lead to irreversible blindness.
phenotype_term:
preferred_term: Blindness
term:
id: HP:0000618
label: Blindness
evidence:
- reference: PMID:12768225
reference_title: Fomivirsen.
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
Cytomegalovirus (CMV) retinitis can rapidly lead to blindness in patients
with acquired immune deficiency syndrome (AIDS).
explanation: Supports blindness as the major outcome of untreated CMV retinitis.
- category: Ophthalmological
name: Immune recovery uveitis
description: >-
Intraocular inflammation arising after immune reconstitution in eyes with
prior CMV retinitis.
phenotype_term:
preferred_term: Uveitis
term:
id: HP:0000554
label: Uveitis
evidence:
- reference: PMID:39046420
reference_title: "Immune recovery uveitis: an ocular manifestation in HIV/AIDS receiving treatment."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
Immune recovery uveitis is an important cause of visual morbidity
particularly in HIV/AIDS patients receiving highly active antiretroviral.
explanation: Supports uveitis (immune recovery uveitis) as a cause of visual morbidity after antiretroviral therapy.
treatments:
- name: Fomivirsen
description: >-
Fomivirsen (Vitravene) is an intravitreally administered antisense
oligonucleotide complementary to cytomegalovirus immediate-early region 2 (IE2)
mRNA. Approved by the FDA in 1998, it was the first antisense oligonucleotide
drug ever approved and was used for CMV retinitis in AIDS patients, including
relapsed disease unresponsive to conventional antivirals.
therapeutic_modality: ANTISENSE_OLIGONUCLEOTIDE
aso_details:
aso_mechanism: RNASE_H_KNOCKDOWN
target_transcript: CMV IE2 mRNA
aso_chemistry: PHOSPHOROTHIOATE
conjugation: UNCONJUGATED
treatment_term:
preferred_term: Pharmacotherapy
term:
id: NCIT:C15986
label: Pharmacotherapy
therapeutic_agent:
- preferred_term: fomivirsen
term:
id: NCIT:C174902
label: Fomivirsen
target_mechanisms:
- target: Productive CMV infection of the retina
treatment_effect: INHIBITS
description: >-
Antisense knockdown of CMV immediate-early region 2 (IE2) mRNA suppresses
viral immediate-early gene expression, blocking productive replication of
cytomegalovirus in the retina.
target_phenotypes:
- preferred_term: Retinitis
term:
id: HP:0032118
label: Retinitis
evidence:
- reference: PMID:12768225
reference_title: Fomivirsen.
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
Fomivirsen is a novel antisense drug with a 21-nucleotide sequence
complementary to the immediate early region 2 of CMV messenger ribonucleic
acid.
explanation: Establishes fomivirsen's antisense mechanism targeting CMV IE2 mRNA.
- reference: PMID:12768225
reference_title: Fomivirsen.
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
In clinical trials, fomivirsen was shown to provide effective treatment for
newly diagnosed, peripheral CMV retinitis in patients with AIDS and in those
with relapsed CMV retinitis that is unresponsive to conventional therapy.
explanation: Supports clinical efficacy of fomivirsen for newly diagnosed and relapsed CMV retinitis.
- reference: PMID:38914784
reference_title: Mechanisms of Action of the US Food and Drug Administration-Approved Antisense Oligonucleotide Drugs.
supports: SUPPORT
evidence_source: OTHER
snippet: "fomiversen (for opportunistic cytomegalovirus infection)"
explanation: Lists fomivirsen among FDA-approved antisense oligonucleotide drugs, for opportunistic CMV infection.
- name: Intravitreal ganciclovir
description: >-
Intravitreal ganciclovir delivers high local antiviral drug concentrations to
control CMV retinitis, used alone or combined with systemic antiviral therapy.
treatment_term:
preferred_term: antiviral agent therapy
term:
id: NCIT:C16119
label: Antiviral Therapy
therapeutic_agent:
- preferred_term: ganciclovir
term:
id: CHEBI:465284
label: ganciclovir
target_mechanisms:
- target: Productive CMV infection of the retina
treatment_effect: INHIBITS
description: >-
Ganciclovir inhibits CMV DNA polymerase, suppressing productive viral
replication in the retina; intravitreal delivery achieves high local
antiviral concentrations.
target_phenotypes:
- preferred_term: Retinitis
term:
id: HP:0032118
label: Retinitis
evidence:
- reference: PMID:37452370
reference_title: Comparison of two different intravitreal treatment regimens combined with systemic antiviral therapy for cytomegalovirus retinitis in patients with AIDS.
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
To compare the efficacy and injection frequency of intravitreal low-dose vs.
intermediate-dose ganciclovir therapy in acquired immune deficiency syndrome
(AIDS) patients exhibiting cytomegalovirus retinitis (CMVR).
explanation: Supports intravitreal ganciclovir as a treatment for CMV retinitis in AIDS patients.
- name: Oral valganciclovir
description: >-
Oral valganciclovir is a prodrug of ganciclovir providing systemic anti-CMV
therapy for induction and maintenance treatment of CMV retinitis.
treatment_term:
preferred_term: antiviral agent therapy
term:
id: NCIT:C16119
label: Antiviral Therapy
therapeutic_agent:
- preferred_term: valganciclovir
term:
id: CHEBI:63635
label: valganciclovir
target_mechanisms:
- target: Productive CMV infection of the retina
treatment_effect: INHIBITS
description: >-
Valganciclovir is an oral prodrug of ganciclovir that provides systemic
inhibition of CMV DNA polymerase, suppressing productive viral replication
for induction and maintenance therapy.
target_phenotypes:
- preferred_term: Retinitis
term:
id: HP:0032118
label: Retinitis
evidence:
- reference: NCIT:C2629
supports: SUPPORT
evidence_source: OTHER
snippet: "Valganciclovir | Accepted_Therapeutic_Use_For | - | - | Cytomegalovirus retinitis"
explanation: >-
NCI Thesaurus asserts accepted therapeutic use of valganciclovir for
cytomegalovirus retinitis.
- name: Foscarnet
description: >-
Foscarnet is a pyrophosphate analogue antiviral used for CMV retinitis,
particularly in ganciclovir-resistant disease or when ganciclovir is not
tolerated.
treatment_term:
preferred_term: antiviral agent therapy
term:
id: NCIT:C16119
label: Antiviral Therapy
therapeutic_agent:
- preferred_term: foscarnet
term:
id: NCIT:C71630
label: Foscarnet
target_mechanisms:
- target: Productive CMV infection of the retina
treatment_effect: INHIBITS
description: >-
Foscarnet, a pyrophosphate analogue, directly inhibits the CMV DNA
polymerase pyrophosphate-binding site, suppressing productive viral
replication including in ganciclovir-resistant disease.
target_phenotypes:
- preferred_term: Retinitis
term:
id: HP:0032118
label: Retinitis
- name: Antiretroviral therapy for immune reconstitution
description: >-
In HIV/AIDS-associated CMV retinitis, antiretroviral therapy restores CD4+
T-cell-mediated immunity and is essential for durable control of the underlying
opportunistic infection, though it can precipitate immune recovery uveitis.
treatment_term:
preferred_term: antiretroviral therapy
term:
id: NCIT:C94631
label: Antiretroviral Therapy
target_mechanisms:
- target: CMV reactivation under impaired cellular immunity
treatment_effect: RESTORES
description: >-
Antiretroviral therapy restores CD4+ T-cell-mediated immunity, reversing
the immunodeficiency that permits latent cytomegalovirus to reactivate and
cause end-organ retinal disease.
evidence:
- reference: PMID:39046420
reference_title: "Immune recovery uveitis: an ocular manifestation in HIV/AIDS receiving treatment."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
Immune recovery uveitis is an important cause of visual morbidity
particularly in HIV/AIDS patients receiving highly active antiretroviral.
explanation: Supports antiretroviral therapy as the immune-reconstituting treatment context for HIV/AIDS CMV retinitis.
- name: Cidofovir
description: >-
Cidofovir (Vistide) is an intravenous nucleotide analogue antiviral approved
by the FDA for CMV retinitis in AIDS patients, particularly for relapsing or
ganciclovir-resistant disease. Its prolonged intracellular half-life allows
biweekly maintenance dosing. Must be co-administered with oral probenecid and
intravenous saline hydration to minimize nephrotoxicity.
treatment_term:
preferred_term: antiviral agent therapy
term:
id: NCIT:C16119
label: Antiviral Therapy
therapeutic_agent:
- preferred_term: cidofovir
term:
id: NCIT:C1600
label: Cidofovir
target_mechanisms:
- target: Productive CMV infection of the retina
treatment_effect: INHIBITS
description: >-
Cidofovir, a nucleotide analogue, inhibits CMV DNA polymerase and
suppresses productive viral replication; its prolonged intracellular
half-life supports biweekly maintenance dosing.
target_phenotypes:
- preferred_term: Retinitis
term:
id: HP:0032118
label: Retinitis
evidence:
- reference: PMID:9036797
reference_title: >-
Intravenous cidofovir for peripheral cytomegalovirus retinitis in patients
with AIDS. A randomized, controlled trial.
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "Cidofovir was efficacious in delaying progression of previously untreated CMV retinitis."
explanation: >-
Randomized controlled trial demonstrating cidofovir efficacy for
previously untreated peripheral CMV retinitis in AIDS patients.
diagnosis:
- name: CD4+ lymphocyte count and CMV risk stratification
description: >-
CMV retinitis occurs almost exclusively in patients with severely impaired
cellular immunity. CD4+ lymphocyte count below 50 cells/mm³ is the principal
immunological threshold identifying patients at highest risk for CMV end-organ
disease; other concurrent opportunistic infections are also a risk marker.
diagnosis_term:
preferred_term: diagnostic procedure
term:
id: NCIT:C18020
label: Diagnostic Procedure
evidence:
- reference: PMID:11294581
reference_title: >-
Laboratory diagnosis of cytomegalovirus (CMV) infections in
immunodepressed patients, mainly in patients with AIDS.
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
appears almost exclusively in patients with a CD4+ lymphocyte count lower
than 50/mm3 and when other opportunistic infections have occurred.
explanation: >-
Establishes CD4+ count below 50/mm³ as the key risk threshold identifying
HIV-positive patients at highest risk for CMV end-organ disease.
- name: CMV viral load quantification (pp65 antigenemia and quantitative PCR)
description: >-
Active CMV infection is confirmed and monitored by quantitative viral load
methods, primarily pp65 antigenemia and quantitative PCR. These assays
identify patients with high viral burden at risk of progressing to CMV
disease and guide pre-emptive antiviral treatment. Shell-vial rapid culture
is an alternative for rapid diagnosis of active infection.
diagnosis_term:
preferred_term: diagnostic procedure
term:
id: NCIT:C18020
label: Diagnostic Procedure
evidence:
- reference: PMID:11294581
reference_title: >-
Laboratory diagnosis of cytomegalovirus (CMV) infections in
immunodepressed patients, mainly in patients with AIDS.
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: >-
Techniques allowing the quantification of CMV viremia, namely pp65
antigenemia and quantitative PCR, have been most useful to this end.
explanation: >-
Supports pp65 antigenemia and quantitative PCR as primary methods for
quantifying CMV viremia and identifying high-risk patients for
pre-emptive antiviral therapy.
mappings:
mondo_mappings:
- term:
id: MONDO:0000878
label: cytomegalovirus retinitis
mapping_predicate: skos:exactMatch
mapping_source: MONDO
mapping_justification: MONDO provides an exact disease term for cytomegalovirus retinitis.
ncit_mappings:
- term:
id: NCIT:C50521
label: Cytomegaloviral Retinitis
mapping_predicate: skos:exactMatch
mapping_source: NCIT
mapping_justification: NCIT provides an exact term for cytomegalovirus retinitis; cross-referenced from MONDO:0000878.