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==Overview==
==Overview==
[[Cytomegalovirus infection|CMV infection]] is caused by [[cytomegalovirus]] which belongs to the family [[Herpesviridae]]. Transmission of [[CMV]] occurs from person to person and results in activation of the [[immune system]]. Patients often present with a [[Mononucleosis/History and symptoms|mononucleosis]]-like presentation with particularly severe complications in [[immunocompromised]] individuals and rarely in [[immunocompetent]] individuals. Reactivation can occur in response to inflammatory stimuli, physiologic [[stress]] and [[immunosuppression]]<nowiki/>rwhicheleasine[[virions]] that can infect new cells causing [[CMV]] end organ infection. [[CMV]] infection can affect the [[eye]], [[gastrointestinal tract]] and the [[central nervous system]]. Common complications of [[CMV]] infection in [[immunocompromised]] patients include [[CMV]] [[retinitis]], [[CMV]] [[colitis]], [[CMV]] [[encephalitis]] and [[CMV]] [[pneumonia]]. CMV is associated with increased risk of [[Graft-versus-host disease|graft versus host disease]], [[myelosuppression]], and invasive bacterial and fungal infections increasing [[morbidity]] and [[mortality]] of the patients. [[Antiviral drugs|Antiviral therapy]] is the primary treatment of choice. The duration of therapy and the [[Antiviral drugs|antiviral agents]] are selected based on the severity of the disease, location of the disease and the level of [[immunosuppression]] of the patient. [[Ganciclovir]] and [[valganciclovir]] are the most commonly used antiviral drugs for the treatment of [[CMV]] infection.


== Historical Perspective ==
== Historical Perspective ==
In 1881, Ribbert described the presence of [[inclusion bodies]] in the cells in sections of kidney of a still born. In 1960, Thomas H.Weller from Harvard University, coined the term "[[cytomegalovirus]]" and isolated the [[virus]] from the urine sample of an [[infant]] with generalized disease.


== Classification ==
== Classification ==
[[Cytomegalovirus infection]] may be classified based on the organ system involved into the following: [[CMV retinitis]], [[CMV colitis]], [[CMV]] [[esophagitis]], [[CMV]] [[pneumonitis]], and [[CMV]] [[encephalitis]].


== Pathophysiology ==
== Pathophysiology ==
Transmission of [[CMV]] occurs from person to person and primary [[CMV]] infection causes activation of the [[immune system]] and resulting in a [[mononucleosis]] like presentation and its complications in [[immunocompromised]] individuals and few [[immunocompetent]] individuals. Reactivation can occur in response to [[inflammatory]] stimuli, physiologic [[stress]] and [[immunosuppression]] releasing new [[virions]] that can infect new cells causing [[CMV]] end organ infection.


== Causes ==
== Causes ==
[[CMV]] infection is caused by [[cytomegalovirus]]. It belongs to order Herpesvirales, in the family [[Herpesviridae]], in the subfamily [[Betaherpesvirinae]].


== Differential Diagnosis of Cytomegalovirus infection ==
== Differential Diagnosis of Cytomegalovirus infection ==
[[Cytomegalovirus infection|CMV infection]] can affect the [[eye]], [[gastrointestinal tract]], and the [[central nervous system]]. Diagnosis of [[CMV]] requires differentiation of infections and diseases presenting with similar features. The majority of patients with [[CMV]] end organ infection are [[Immunosuppression|immunosuppressed]]. Therefore [[CMV infection]] must be suspected in all the patients presenting with [[immunosuppression]] and differentiated from other conditions known to affect [[immunocompromised]] patients.


== Epidemiology and Demographics ==
== Epidemiology and Demographics ==
[[Cytomegalovirus]] infection is seen approximately 40-90% of the world population, however, only manifests in serious complications in [[immunocompromised]] patients.


== Risk Factors ==
== Risk Factors ==
Patients with the following conditions or undergoing the following procedures are at a higher risk for developing symptomatic [[cytomegalovirus infection]]: [[Organ transplant|solid organ transplant]], [[Hematopoietic stem cell transplantation|hematological stem cell transplant]], [[AIDS]], and existing [[T-cell|T-cell deficiency]].


== Screening ==
== Screening ==
There is no standard screening recommended for [[cytomegalovirus infection]] due to the high [[seroprevalence]].


== Natural History, Complications and Prognosis ==
== Natural History, Complications and Prognosis ==
Primary [[Cytomegalovirus infection|CMV infection]] takes place in childhood and early [[adolescence]] is asymptomatic. After the resolution of the primary infection [[CMV]] is latent in the mononuclear [[leukocytes]]. Reactivation in [[immunocompetent]] patients presents with [[mononucleosis]] like syndrome, but severe [[infection]] can occur in elderly and critically ill patients. Common complications of [[CMV infection]] in [[immunocompromised]] patients include [[CMV retinitis]], [[Colitis|CMV colitis]], CMV [[encephalitis]], CMV [[pneumonia]] and CMV [[myocarditis]]. [[CMV]] is associated with increased risk of [[Graft-versus-host disease|graft versus host disease]], [[myelosuppression]], and invasive bacterial and fungal infections increasing [[morbidity]] and [[mortality]] of the patients.


== Diagnosis ==
== Diagnosis ==


=== History and Symptoms ===
=== History and Symptoms ===
Primary infection in majority of patients have a [[mononucleosis]] like presentation. Patients with [[immunosuppression]] have symptoms related to the affected organ system. [[Retinitis]] presents with [[blurred vision]] and [[floaters]]. [[Colitis]] presents with [[abdominal pain]] and [[bloody diarrhea]]. [[Pneumonitis]] is usually asymptomatic. Neurologic infection presents with [[altered mental status]] and focal neurological deficits.


=== Physical Examination ===
=== Physical Examination ===
The appearance of the patient depends on the stage of the disease. The patient may look very healthy or be ill-looking and cachectic. On [[fundus]] examination fluffy yellow-white retinal lesions, with or without intraretinal [[hemorrhages]] can be demonstrated in patients with [[CMV infection|CMV]] [[retinitis]]. [[Abdominal distension]] and [[tenderness]] can be present on examination in patients with [[CMV]] [[colitis]]. In patients with [[CMV]] [[encephalitis]] [[altered mental status]] and focal neurological deficits are present.


=== Laboratory Findings ===
=== Laboratory Findings ===
There are no specific laboratory findings associated with [[CMV]] infection. Elevated [[ESR]] and a low [[lymphocyte]] count may be present in patients with complications. Diagnosis is usually done by demonstration of the [[inclusion bodies]] from the [[Biopsy|tissue biopsies]] or by a positive [[PCR]] for [[CMV]] [[DNA]].


=== Electrocardiogram ===
=== Electrocardiogram ===
There are no [[EKG]] changes associated with [[cytomegalovirus infection]].


=== Chest X-Ray ===
=== Chest X-Ray ===
[[Chest X-ray|Chest X-Ray]] in [[cytomegalovirus]] [[pneumonitis]] demonstrates diffuse pulmonary interstitial infiltrates.


=== CT Scan ===
=== CT Scan ===
[[CT]] scan of the abdomen in patients with [[colitis|CMV colitis]] demonstrates colonic thickening.  On brain CT, the presence of periventricular enhancement is suggestive of [[Encephalitis|ventriculoencephalitis]] which is a common (but non-specific) finding in CMV [[encephalitis]].


=== MRI ===
=== MRI ===
Periventricular enhancement is present in patients with [[Encephalitis|ventriculoencephalitis]] on brain [[MRI]].


=== Echocardiography ===
=== Echocardiography ===
There are no [[echocardiography]] findings associated with [[CMV infection]].


=== Other imaging findings ===
=== Other imaging findings ===
[[CMV infection]] is diagnosed by demonstration of intranuclear [[inclusion bodies]] and a positive [[PCR]], therefore there are no other specific imaging findings for [[CMV infection|CMV infection.]]


=== Other Diagnostic Tests ===
=== Other Diagnostic Tests ===
Other diagnostic studies helpful for the diagnosis of [[CMV infection]] include upper GI [[endoscopy]], [[colonoscopy]], [[serology]] and [[PCR]].


== Treatment ==
== Treatment ==


=== Medical Therapy ===
=== Medical Therapy ===
[[Antiviral drugs|Antiviral therapy]] is the primary modality of treatment. Duration of therapy and the antiviral agents are selected based on the severity of the disease, location of the disease and the level of [[immunosuppression]]. [[Ganciclovir]] and [[valganciclovir]] are the commonly used [[antiviral drugs]] for the treatment of [[CMV infection]].


=== Surgery ===
=== Surgery ===
Surgical intervention is not recommended for the management of [[cytomegalovirus infection]].


== Prevention ==
== Prevention ==


=== Primary Prevention ===
=== Primary Prevention ===
Primary prevention measures for CMV infection include regular hand washing to reduce the spread of infections. Healthcare providers should follow standard precautions to prevent [[nosocomial]] transmission particularly to immune compromised individuals.


=== Secondary Prevention ===
=== Secondary Prevention ===
__NOTOC__
Secondary prevention of [[Cytomegalovirus infection|CMV infection]] includes preemptive treatment with [[Antiviral drugs|antiviral agents]] in asymptomatic patients with positive blood [[PCR]] for [[CMV]] [[DNA]].
==References==
{{Reflist|2}}
 
[[Category:Emergency medicine]]
[[Category:Disease]]
[[Category:Up-To-Date]]
[[Category:Infectious disease]]
[[Category:Neurology]]
[[Category:Neurosurgery]]
[[Category:Gastroenterology]]
[[Category:Ophthalmology]]

Latest revision as of 21:13, 29 July 2020

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Aravind Kuchkuntla, M.B.B.S[2]

Overview

CMV infection is caused by cytomegalovirus which belongs to the family Herpesviridae. Transmission of CMV occurs from person to person and results in activation of the immune system. Patients often present with a mononucleosis-like presentation with particularly severe complications in immunocompromised individuals and rarely in immunocompetent individuals. Reactivation can occur in response to inflammatory stimuli, physiologic stress and immunosuppressionrwhicheleasinevirions that can infect new cells causing CMV end organ infection. CMV infection can affect the eye, gastrointestinal tract and the central nervous system. Common complications of CMV infection in immunocompromised patients include CMV retinitis, CMV colitis, CMV encephalitis and CMV pneumonia. CMV is associated with increased risk of graft versus host disease, myelosuppression, and invasive bacterial and fungal infections increasing morbidity and mortality of the patients. Antiviral therapy is the primary treatment of choice. The duration of therapy and the antiviral agents are selected based on the severity of the disease, location of the disease and the level of immunosuppression of the patient. Ganciclovir and valganciclovir are the most commonly used antiviral drugs for the treatment of CMV infection.

Historical Perspective

In 1881, Ribbert described the presence of inclusion bodies in the cells in sections of kidney of a still born. In 1960, Thomas H.Weller from Harvard University, coined the term "cytomegalovirus" and isolated the virus from the urine sample of an infant with generalized disease.

Classification

Cytomegalovirus infection may be classified based on the organ system involved into the following: CMV retinitis, CMV colitis, CMV esophagitis, CMV pneumonitis, and CMV encephalitis.

Pathophysiology

Transmission of CMV occurs from person to person and primary CMV infection causes activation of the immune system and resulting in a mononucleosis like presentation and its complications in immunocompromised individuals and few immunocompetent individuals. Reactivation can occur in response to inflammatory stimuli, physiologic stress and immunosuppression releasing new virions that can infect new cells causing CMV end organ infection.

Causes

CMV infection is caused by cytomegalovirus. It belongs to order Herpesvirales, in the family Herpesviridae, in the subfamily Betaherpesvirinae.

Differential Diagnosis of Cytomegalovirus infection

CMV infection can affect the eye, gastrointestinal tract, and the central nervous system. Diagnosis of CMV requires differentiation of infections and diseases presenting with similar features. The majority of patients with CMV end organ infection are immunosuppressed. Therefore CMV infection must be suspected in all the patients presenting with immunosuppression and differentiated from other conditions known to affect immunocompromised patients.

Epidemiology and Demographics

Cytomegalovirus infection is seen approximately 40-90% of the world population, however, only manifests in serious complications in immunocompromised patients.

Risk Factors

Patients with the following conditions or undergoing the following procedures are at a higher risk for developing symptomatic cytomegalovirus infection: solid organ transplanthematological stem cell transplantAIDS, and existing T-cell deficiency.

Screening

There is no standard screening recommended for cytomegalovirus infection due to the high seroprevalence.

Natural History, Complications and Prognosis

Primary CMV infection takes place in childhood and early adolescence is asymptomatic. After the resolution of the primary infection CMV is latent in the mononuclear leukocytes. Reactivation in immunocompetent patients presents with mononucleosis like syndrome, but severe infection can occur in elderly and critically ill patients. Common complications of CMV infection in immunocompromised patients include CMV retinitis, CMV colitis, CMV encephalitis, CMV pneumonia and CMV myocarditis. CMV is associated with increased risk of graft versus host disease, myelosuppression, and invasive bacterial and fungal infections increasing morbidity and mortality of the patients.

Diagnosis

History and Symptoms

Primary infection in majority of patients have a mononucleosis like presentation. Patients with immunosuppression have symptoms related to the affected organ system. Retinitis presents with blurred vision and floaters. Colitis presents with abdominal pain and bloody diarrhea. Pneumonitis is usually asymptomatic. Neurologic infection presents with altered mental status and focal neurological deficits.

Physical Examination

The appearance of the patient depends on the stage of the disease. The patient may look very healthy or be ill-looking and cachectic. On fundus examination fluffy yellow-white retinal lesions, with or without intraretinal hemorrhages can be demonstrated in patients with CMV retinitis. Abdominal distension and tenderness can be present on examination in patients with CMV colitis. In patients with CMV encephalitis altered mental status and focal neurological deficits are present.

Laboratory Findings

There are no specific laboratory findings associated with CMV infection. Elevated ESR and a low lymphocyte count may be present in patients with complications. Diagnosis is usually done by demonstration of the inclusion bodies from the tissue biopsies or by a positive PCR for CMV DNA.

Electrocardiogram

There are no EKG changes associated with cytomegalovirus infection.

Chest X-Ray

Chest X-Ray in cytomegalovirus pneumonitis demonstrates diffuse pulmonary interstitial infiltrates.

CT Scan

CT scan of the abdomen in patients with CMV colitis demonstrates colonic thickening. On brain CT, the presence of periventricular enhancement is suggestive of ventriculoencephalitis which is a common (but non-specific) finding in CMV encephalitis.

MRI

Periventricular enhancement is present in patients with ventriculoencephalitis on brain MRI.

Echocardiography

There are no echocardiography findings associated with CMV infection.

Other imaging findings

CMV infection is diagnosed by demonstration of intranuclear inclusion bodies and a positive PCR, therefore there are no other specific imaging findings for CMV infection.

Other Diagnostic Tests

Other diagnostic studies helpful for the diagnosis of CMV infection include upper GI endoscopy, colonoscopy, serology and PCR.

Treatment

Medical Therapy

Antiviral therapy is the primary modality of treatment. Duration of therapy and the antiviral agents are selected based on the severity of the disease, location of the disease and the level of immunosuppression. Ganciclovir and valganciclovir are the commonly used antiviral drugs for the treatment of CMV infection.

Surgery

Surgical intervention is not recommended for the management of cytomegalovirus infection.

Prevention

Primary Prevention

Primary prevention measures for CMV infection include regular hand washing to reduce the spread of infections. Healthcare providers should follow standard precautions to prevent nosocomial transmission particularly to immune compromised individuals.

Secondary Prevention

Secondary prevention of CMV infection includes preemptive treatment with antiviral agents in asymptomatic patients with positive blood PCR for CMV DNA.

References