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Background: Two types of Epstein Barr virus (EBV1 and 2) have been shown to infect humans. This study aimed to detect the types of EBV that cause infectious mononucleosis and correlate these viral types with clinical parameters in the metropolitan region of Belém from 2005 to 2016. Methods: A total of 76 cases of infectious mononucleosis (IM) were processed at the Instituto Evandro Chagas, Ananindeua, Brazil. PCR was used to analyze the EBNA 3C region for the recognition of EBV types. Biochemical testing (aspartate aminotransferase (AST), alanine aminotransferase (ALT) and gamma-glutamyl transferase (GGT) was performed by the COBAS INTEGRA clinical biochemistry PLUS 400 / ROCHE automatic analyzer. The data were evaluated using the Statistical Package for Social Science - SPSS 17.0 and GraphPadPrism 7.0 for Windows. Results: EBV1 infection was observed in 71.1% (54/76) of individuals, among whom those > 14 years constituted 66.7% (36/54); the average age was 23 years, and the number of women infected was higher (61.1% [33/54]) than that of men 38.9%[21/54]). The symptoms/clinical signs observed in infection by EBV1 were cervical lymphadenopathy in 64.8% (35/54), fever in 63% (34/54), headache and arthralgia in 20.3% (11/54), and exanthema in 18.5% (10/54). Infection by EBV2 was observed in only 17.1% (13/76) of cases. Coinfections by EBV1 and EBV2, most frequently showing symptoms of fever and cervical lymphadenopathy, occurred in 66.7% (6/9) and 55.6% (5/9) of individuals. Alterations to AST were confirmed in 14.8% (8/54), EBV2 of cases in 7.7% (1/13) in EBV1 infection. Conclusions: EBV1 was predominant in 71% of clinical cases of infectious mononucleosis. The correlation of biochemical parameters in infection by EBV1, EBV2, and coinfections by EBV1/2 revealed a statistically significant difference in mean changes of EBV1 in individuals older than 14 years.