Webster's New World Medical Dictionary

human herpesvirus 1 through 5
See 
HHV.
human herpesvirus 6
A herpes virus that
apparently lies dormant in many people, and is most
likely to cause problems when the immune system
is compromised by disease, as in AIDS patients, or
by deliberate immune suppression, as in organ
transplant patients. Abbreviated HHV-6. There are
two forms of HHV-6: A and B. A is rare and is
acquired in adulthood. B is relatively common, is
usually acquired in childhood, and is associated
with roseola. Both HHV-6 A and B can reactivate at
a later date and are believed to contribute to dis-
eases of the bone marrow and/or central nervous
system in some patients, including fatal encephali-
tis, chronic fatigue syndrome, and possibly multiple
sclerosis. Diagnosis is made via rapid blood culture
or other blood test. Treatment is experimental, but
antiviral drugs or beta interferon may be tried.
human herpesvirus 7
A herpes virus that
causes seizures and other central nervous system
symptoms in children. Abbreviated HHV-7. Closely
related to HHV-6, HHV-7 has also been linked to
roseola. Diagnosis is made via rapid blood culture
or other blood test. Treatment is experimental at
this time, but antiviral drugs or beta interferon may
be tried.
human herpesvirus 8
A herpesvirus that may
contribute to Kaposi sarcoma, a rare form of cancer
that is sometimes seen in AIDS patients, and to some
B-cell lymphomas. Abbreviated HHV-8. Diagnosis is
made via rapid blood culture or other blood test.
Treatment is experimental at this time, but antiviral
drugs or beta interferon may be tried. Also known
as Kaposi sarcoma-associated herpesvirus (KSHV).
human immunodeficiency virus
See 
HIV.
human leukocyte antigen
See 
HLA.