Cytomegalovirus esophagitis is a form of esophagitis associated with cytomegalovirus. Ganciclovir is an antiviral medication used to treat cytomegalovirus (CMV) infections. Retinitis may be caused by several infectious agents, including toxoplasmosis, cytomegalovirus and candida. These include opportunistic infection with "Mycobacterium avium-intracellulare" and cytomegalovirus (CMV). Viruses identified that have an effect on neutrophils are rubella and cytomegalovirus. Currently, routine testing is available for HIV-1, cytomegalovirus, hepatitis B virus, and hepatitis C virus. After organ transplantation or in otherwise immunocompromised persons, there are high rates of cytomegalovirus pneumonia. It is occasionally caused by Epstein-Barr virus, herpes simplex virus, cytomegalovirus, or HIV. Viruses linked to this can include; hepatitis C, cytomegalovirus, paramyxovirus, influenza A and adenovirus. Congenital cytomegalovirus infection can be an important cause. Congenital cytomegalovirus infection can lead to significant morbidity and even death. Elevated antibodies of cytomegalovirus and HPV were also found to be predictors. One study did not show significant decrease in the risk of congenital cytomegalovirus infection. A causal link with cytomegalovirus (CMV) has been strongly implicated in a 2011 research. Glioblastoma has been associated with the viruses SV40, HHV-6, and cytomegalovirus.