There are several studies (see below) linking cytomegalovirus (CMV) infection with mental health symptoms such as anxiety, depression, bipolar and psychosis.
The first study below shows that it is only in cases of high cytomegalovirus antibody titres that anxiety and depression may appear (those positive for cytomegalovirus antibodies but with low titres did not have an higher prevalence of these mental conditions).
In my case, my cytomegalovirus antibody levels are constantly pretty high, some 34 times higher than the lab reference for negative. And I have anxiety and depression symptoms.
Studies Linking Cytomegalovirus to Mental Health Issues
Cytomegalovirus is associated with depression and anxiety in older adults 2008
The majority of the participants (66%) were CMV-seropositive and seropositive status was not associated with psychological morbidity.
However, within the CMV-positive group, individuals with higher CMV-specific antibody titres were more likely to be depressed, anxious, and suffer more overall psychological morbidity.
CMV infection might be a contributing causal factor for any psychiatric disorder.
CMV was more strongly associated with a more selected group of neurotic, stress-related, and somatoform disorders
The results of this meta-analysis study demonstrated that CMV infection might have associations with the incidence of mood disorders.
CMV seropositivity significantly increased the odds of a mood disorder diagnosis (bipolar disorder: OR = 2.45; major depression: OR = 3.70) and among the psychiatric samples, of suicide (OR = 2.09).
A Peptide Link Between Human Cytomegalovirus Infection, Neuronal Migration, and Psychosis 2020
Psychosis also appears to be linked to human cytomegalovirus (HCMV) infection.
Cytomegalovirus infection and IQ in patients with severe mental illness and healthy individuals 2021
Our findings suggest that CMV exposure may affect IQ in patients with severe mental illness but not HC [healthy controls].
Cytomegalovirus Antivirals
Antiviral drugs for CMV include Valcyte (valganciclovir), Vistide (cidofovir), Foscavir (foscarnet), Prevymis (letermovir) and Livtencity (maribavir).
Famvir (famciclovir) and Valtrex (valacyclovir) may have antiviral effects for CMV, though reports are contradictory.
Off-label drugs which are antiviral for CMV include: possibly artesunate (anti-malarial drug), leflunomide (immunosuppressive autoimmune disease drug).
Supplements which may have a mild antiviral effect on CMV in vivo include: monolaurin, Terminalia chebula, black seed oil (Nigella sativa), genistein, chlorella.
Natural killer (NK) cells are considered important in the control of cytomegalovirus infection, so some of the NK function boosters listed in this post might be helpful.