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© 1980 Oxford University Press

research-article

A Prospective Clinical Study of the Mononucleosis Syndrome in a Developing Country

C S PANNUTI*, R P S CARVALHO*, A S EVANS{dagger}, L C CENABRE{dagger}, V AMATO NETO*, M CAMARGO*, M J O ANGELO* and S TAKIMOTO*

* Institute de Medicina Tropical de Sao Paulo e Departamento de Microbiologia e Imunologia do Instituto de Ciencias Biomedicas da Universidade de Sao Paulo Sao Paulo Brazil
{dagger} Department of Epidemiology and Public Health, Yale University School of Medicine New Haven, Connecticut

Pannuti C S (Instituto de Medicine Tropical de Sao Paulo e Departamento de Microbiologia e Imunologiado Instituto de Ciencias Biomedicas da Unrversidade de Sao Paulo, Sao Paulo, Brazil), Carvalho R P S, Evans A S, Cenabre L C, Amato Neto V, Camargo M, Angelo M J O and Takimoto S. A prospective clinical study of the mononucleosis syndrome in a developing country. International Journal of Epidemiology 1980, 9: 349–353.

A prospective aetiologic analysis made of 70 children and adults with the clinical and haematologic features of infectious mononucleosis (IM) in Sao Paulo, Brazil, revealed 65.7% due to EBV (31 heterophile antibody positive (HA+), 15 HA negative (HA - ) cases), 8.6% due to T. gondil and 4.3% due to CMV. One case was related to viral hepatitis and one to drug hypersensitivity. The other 18.6% were of unknown cause. In the 46 IM cases positive tests were found for EBV/IgM in 93.5%, for heterophile by the absorbed horse Rbc test in 64.2% and by sheep Rbc in 37%. The immune-adherence haemagglutination test was slightly more sensitive than the horse Rbc test in 39 IM sera tested. In 41 EBV/IgM positive sera, EBV/lgA was present in 17/25 containing heterophile antibody and in 2/16 lacking heterophile antibody; anti-EA was present in 85%. The average age of HA + IM cases was 13.2 years and of HA- cases 4.7 years. Three HA + and 5 HA—IM cases occurred in the 0–2 year old age group. Few clinical features differentiated between aetiological agents. Exudative tonsillitis was the most helpful one a.nd occurred in 67.7% of HA + IM cases, 26.7% of HA - cases, in 1 of 3 CMV cases,and not at all in 6 T. gondii infections.

Received 10 June 1980


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