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Human cytomegalovirus (CMV) is a type of virus. Viruses are tiny organisms that can enter your body and cause disease. CMV is related to the virus that causes herpes. Like many other viruses, CMV can invade human cells. It can then use those cells to reproduce and spread. If the virus makes many copies of itself, it may disrupt how cells normally work.
In people with a normal immune system, CMV usually doesn’t cause much of a problem. Your immune system keeps the virus in check so it can’t do any harm. It often doesn’t cause any symptoms. Sometimes CMV might cause temporary symptoms like fever and fatigue. Very rarely, it can cause major problems in people with a normal immune system.
After infection, CMV often stays dormant in the body. That means that some of your cells stay infected with the virus. But the virus isn’t actively reproducing or causing symptoms. In some cases, the virus can become active again. It makes copies of itself and harms cells.
Infection with CMV is very common worldwide. Most people don’t even know they have it. In the U.S., infection rates are higher in women and older adults. It also more common in people from lower socioeconomic backgrounds.
CMV infection is spread from one person to another. The virus is passed on when a person comes into direct contact with an infected person’s bodily fluids. These include blood, urine, saliva, semen, tears, and breastmilk. A pregnant mother can pass CMV to her unborn child.
People who have organ transplants are also more likely to get the virus. Transplants include a solid organ, bone marrow, or stem cell transplant. If you have had one of these, you must take medicine for life to prevent your immune system from damaging the donated tissue. Otherwise, the cells of the immune system may attack the transplanted organ. Your body thinks the new organ is a threat. This is called organ rejection.
The medicines you take after an organ transplant can help prevent damage to your donated organ. But they can have other effects on your immune system. They make it harder to fight off CMV and other infections.
Certain types of transplants may have a higher risk for CMV. These include a lung or a small bowel transplant. You also might have a higher risk for the disease if you didn’t previously have the infection but your donor organ came from someone who had it.
You may also have a greater risk of CMV disease if your immune system is not working as it should. Your specific risk may depend on a number of factors, such as:
An active CMV infection may cause a flu-like illness. Symptoms may include:
When CMV invades certain tissues, it can cause serious problems and even death. Most of the time, these symptoms start between 1 and 4 months after the transplant. They may start later if you were taking antiviral medicine at that time. They may also start after you stop taking this medicine.
Before your transplant, your healthcare provider may want to know whether you have an inactive infection with CMV. Your organ donor may also undergo testing for CMV. This information will help make a treatment plan to lower your chances of a CMV infection. A number of different tests might give this information. Your healthcare provider can let you know at this time if you have an inactive CMV infection.
If you don’t have a CMV infection, you might become newly infected with it if the donated organ was already carrying the virus. If you do have a CMV infection, there is a risk that the virus will reactivate after your transplant.
After your transplant, your healthcare provider may watch you for signs of active CMV infection. He or she will ask about any current symptoms and do a physical exam. You may also need other tests. These may include:
If you have an active CMV infection that is causing symptoms, you will need treatment. Antiviral medicines like ganciclovir or valganciclovir can help. These medicines can help kill the virus. But they cannot make you completely virus free.
Based on how serious your illness is, you might take an antiviral medicine by mouth or through an IV. Your healthcare provider will watch your symptoms and the amount of virus in your body to decide the extent of your treatment. Healthcare providers don’t want to give these medicines for a long time. They can cause other side effects and problems.
Many people with active CMV infections recover quite well. Sometimes an active sickness can cause severe problems. That’s especially the case if not treated early.
An active CMV infection can cause major health problems, like:
These health problems may cause other symptoms. They may also require their own treatments. Sometimes that may involve supportive care in an intensive care unit. These complications can even result in death.
Active CMV infection can also raise your risk for organ rejection. You may need another transplant. Preventive treatments have greatly reduced the number of people who have serious problems from active CMV infection.
CMV may also raise your risk for certain chronic disorders after the transplant. These include atherosclerosis and diabetes.
Your healthcare team will do everything possible to help prevent active CMV infection. If your healthcare provider thinks you have a high risk for a new CMV infection or reactivation, he or she might start preventive antiviral medicines. You may take an antiviral medicine like valganciclovir right after your transplant. You may need to stay on it for some months. The medicine will greatly lower your chance of getting an active CMV infection. But sometimes people get an active CMV infection after stopping these medicines.
Other times, your healthcare provider might try to prevent you from having the symptoms of the infection using something called preemptive therapy. In this case, your healthcare provider might want you to have weekly lab tests to see if CMV has become active. In this way, he or she can find an active infection before you have any symptoms. It allows quicker treatment. That will cut your chance of complications.
Call your healthcare provider right away if you have any symptoms of a possible active CMV infection. These include:
Tips to help you get the most from a visit to your health care provider:
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