Cytomegalovirus Infection

What is Cytomegalovirus Infection?

Cytomegalovirus infection, often called CMV, is a viral infection that affects millions of people worldwide. CMV belongs to the herpes virus family and spreads through bodily fluids like saliva, blood, urine, and breast milk. Most healthy people infected with CMV never know they have it because their immune system keeps the virus under control.

Once you contract CMV, the virus stays in your body for life in an inactive state. Your immune system keeps it dormant, but it can reactivate if your immune system becomes weakened. This is why CMV poses the greatest risk to people with compromised immune systems, pregnant women, and newborns. Understanding your CMV status through blood testing helps you make informed decisions about your health.

In the United States, about 1 in 3 children are already infected by age 5, and more than half of adults have had CMV by age 40. The infection is so common that many doctors consider it a normal part of life. However, knowing your status matters if you work with young children, plan to become pregnant, or have a weakened immune system.

Cytomegalovirus (CMV) Antibodies, IgG

Detect past CMV infections easily
Reveal your immune system's response
Clarify unexplained symptoms quickly

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Complete Blood Count / CBC (includes Differential and Platelets)

Reveal underlying infections or inflammations effortlessly
Detect anemia or other blood disorders early
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White Blood Cell Count (WBC)

Detect infections early and stay healthy
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Clarify unexplained fatigue or weakness

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Symptoms

Fever that lasts several days or weeks
Extreme fatigue and general weakness
Sore throat and swollen glands
Muscle aches and joint pain
Night sweats
Loss of appetite
Enlarged liver or spleen
Swollen lymph nodes

Most healthy people with CMV have no symptoms at all. When symptoms do appear, they often resemble mononucleosis with prolonged fatigue and fever. People with weakened immune systems may experience more severe symptoms affecting the eyes, lungs, liver, or digestive system. Newborns infected before birth can develop serious complications including hearing loss, vision problems, and developmental delays.

Causes and risk factors

CMV spreads through close contact with infected bodily fluids. You can catch CMV from saliva through kissing, sharing utensils, or drinking from the same cup as an infected person. The virus also spreads through sexual contact, blood transfusions, and organ transplants. Young children in daycare settings often spread CMV to each other and to their caregivers. Pregnant women can pass CMV to their unborn babies, which is the most serious form of transmission.

Your risk increases if you work in healthcare or childcare, have multiple sexual partners, or receive organ transplants or blood transfusions. People with weakened immune systems from HIV, cancer treatment, or immunosuppressive medications face higher risks of CMV reactivation. The virus is not highly contagious compared to other infections, but repeated or prolonged exposure increases your chances of infection.

How it's diagnosed

CMV infection is diagnosed through blood tests that detect antibodies your body makes in response to the virus. The Cytomegalovirus Antibody IgG test shows whether you have ever been infected with CMV. A positive IgG result means you were infected at some point, while a negative result means you have never had CMV. Your White Blood Cell Count can also provide clues, as CMV often causes atypical lymphocytes similar to other viral infections.

Rite Aid offers CMV antibody testing as part of our preventive health panel at over 2,000 Quest Diagnostics locations nationwide. Testing is especially important if you are planning pregnancy, work with young children, or have immune system concerns. Early detection helps you take precautions to prevent spreading the virus to others who may be at higher risk.

Treatment options

Rest and adequate sleep to support immune function
Drink plenty of fluids to stay hydrated
Over-the-counter pain relievers for fever and muscle aches
Antiviral medications like ganciclovir or valganciclovir for severe cases
Immune globulin therapy for immunocompromised patients
Regular monitoring of organ function in serious infections
Avoiding contact with people who have weakened immune systems
Good hand hygiene to prevent spreading the virus

Frequently asked questions

CMV cannot be cured because the virus remains dormant in your body for life after infection. Your immune system keeps the virus inactive in most cases. Antiviral medications can treat active infections and control symptoms, but they do not eliminate the virus. Most healthy people live normal lives with dormant CMV.

CMV symptoms typically appear 3 to 12 weeks after initial infection, though many people never develop symptoms at all. The incubation period varies based on how the virus was transmitted and your immune system strength. When symptoms do occur, they can last from 2 weeks to several months. Blood tests can detect CMV antibodies even before symptoms appear.

CMV can be dangerous if a pregnant woman gets infected for the first time during pregnancy. The virus can pass to the developing baby and cause serious birth defects including hearing loss, vision problems, and developmental delays. Women who already have CMV before pregnancy rarely pass it to their babies. Testing before pregnancy helps identify your risk level.

CMV antibody blood tests are highly accurate at detecting past or current infection. The IgG test shows whether you have ever been exposed to CMV with greater than 95% accuracy. IgM tests can detect recent infections but may sometimes show false positives. Your doctor may order multiple tests over time to confirm active infection.

You can get infected with different strains of CMV even if you already have antibodies from a previous infection. However, reinfection with a new strain is rare and usually causes milder symptoms than the first infection. The bigger concern is reactivation of the dormant virus if your immune system becomes weakened. This is why immunocompromised people need regular monitoring.

Healthcare workers do not routinely need CMV testing unless they work with high-risk patients or are planning pregnancy. Knowing your CMV status can help you take appropriate precautions when caring for immunocompromised patients or newborns. Standard infection control practices like hand washing effectively prevent CMV transmission in healthcare settings. Discuss testing with your doctor if you have specific concerns.

A positive CMV IgG test means you have been infected with cytomegalovirus at some point in your life. The virus is now dormant in your body and your immune system has produced antibodies to control it. Most people with positive IgG results are healthy and have no symptoms. This result is extremely common and affects more than half of adults by age 40.

Prevent CMV transmission by washing your hands frequently, especially after contact with saliva or urine from young children. Avoid sharing eating utensils, drinking glasses, or toothbrushes with others. Do not kiss young children on the mouth if you work in childcare. Practice safe sex and avoid contact with people who have weakened immune systems during active infection.

Most healthy adults with CMV have no long-term health problems after the initial infection resolves. The virus remains dormant and causes no symptoms in people with normal immune systems. Some research suggests CMV may contribute to immune system aging over many decades, but this remains under study. Regular preventive health monitoring helps catch any potential complications early.

See a doctor if you have prolonged fever, extreme fatigue, or swollen glands that last more than 2 weeks. Seek immediate care if you are pregnant and have been exposed to CMV or develop symptoms. People with weakened immune systems should contact their doctor at the first sign of infection. Blood testing can quickly determine if CMV is causing your symptoms.