PEDIATRICS Vol. 75 No. 6 June 1985, pp. 1011-1019
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Epstein-Barr Virus Infectious Mononucleosis in Children

II. Heterophil Antibody and Viral-Specific Responses

Ciro Valent Sumaya MD1 and Yasmin Ench BSc2

1 The Department of Pediatrics, University of Texas Health Science Center, San Antonio
2 The Department of Pathology, University of Texas Health Science Center, San Antonio

An investigation was performed to address the need to establish the rate of positive heterophil antibody responses, oropharyngeal isolation of Epstein-Barr virus (EBV), and the evolving pattern of EBV-specific antibody responses among children with documented EBV-infectious mononucleosis. Findings showed that the rate of heterophil antibody responses appeared to increase progressively with advancing age from infancy up to 4 years, after which the rates approached values similar to that reported in young adult patients. The rapid slide test detected a heterophil antibody response as frequently as the Paul-Bunnell-Davidsohn horse cell test, except in children less than 4 years old. The decreased sensitivity found with the rapid slide test in the very young was associated with their less intense heterophil response. The younger group of children also developed a lower acute mean titer and, as a result, a decreased persistence of immunoglobulin M antibody to EBV-capsid antigen, whereas they had more frequent responses to EBV-early antigen directed to restricted component than both the older subjects and adults reported elsewhere. Antibodies to EBV-nuclear antigen, characteristically a late-onset antibody, tended to develop earlier than noted in adult patients. In contrast, the prevalence and continued excretion of EBV from oropharyngeal secretions was similar to that reported in adult patients. It is speculated that these age-related differences in host responses are associated with the ontogeny of the immunologic system.

Key Words: Epstein-Barr virus • infectious mononucleosis • heterophil antibody • Paul-Bunnell-Davidsohn test • serology

Submitted on November 4, 1983
Accepted on April 27, 1984




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