Prolonged illness after infectious mononucleosis is associated with altered immunity but not with increased viral load.
BACKGROUND
Primary Epstein-Barr virus (EBV) infection causes a spectrum of characteristics that range from asymptomatic seroconversion to severe infectious mononucleosis (IM), sometimes with prolonged symptoms and disability. We examined the relationships between clinical course, number of viral copies, and immunological parameters in a prospective cohort of subjects with recent IM.


METHODS
Eight case patients with at least 6 months of disabling symptoms and 31 matched control subjects who had recovered promptly were included. Symptom scores were recorded at regular intervals over the course of 12 months. Cellular EBV load, EBV-specific antibody responses, lymphocyte subsets, and EBV-specific interferon (IFN)- gamma induction were measured.


RESULTS
In case patients with prolonged illness, the severity of acute-phase symptoms was greater, the development of anti-EBV nuclear antigen-1 immunoglobulin G was more rapid, and the time to development of the peak IFN- gamma response to the majority of latent-cycle EBV peptides was generally slower than those in control subjects. However, in both groups, neither viral nor immune parameters correlated with the severity or duration of symptoms.


CONCLUSIONS
The resolution of symptomatic IM is not determined by control of viremia, nor is it easily explained by altered host responses to EBV infection. The detailed determinants of delayed recovery remain to be elucidated.
Cameron
Barbara
B
School of Medical Sciences, Inflammatory Diseases Research Unit, University of New South Wales, Sydney, Australia.
Bharadwaj
Mandvi
M
Burrows
Jacqueline
J
Fazou
Chrysa
C
Wakefield
Denis
D
Hickie
Ian
I
Ffrench
Rosemary
R
Khanna
Rajiv
R
Lloyd
Andrew
A
D000293:Adolescent; D000328:Adult; D000914:Antibodies, Viral / Q000097:blood; D000956:Antigens, Viral / Q000276:immunology; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology; D036022:Capsid Proteins / Q000276:immunology; D004279:DNA, Viral / Q000097:blood; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D005434:Flow Cytometry; D004854:Herpesvirus 4, Human / Q000276:immunology / Q000302:isolation & purification / Q000502:physiology*; D006801:Humans; D007244:Infectious Mononucleosis / Q000276:immunology* / Q000503:physiopathology* / Q000821:virology; D007371:Interferon-gamma / Q000096:biosynthesis; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D016176:T-Lymphocyte Subsets / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology; D013997:Time Factors; D019562:Viral Load; D014766:Viremia
D000914:Antibodies, Viral; D000956:Antigens, Viral; D036022:Capsid Proteins; D004279:DNA, Viral; C041788:Epstein-Barr viral capsid antigen; D007371:Interferon-gamma