Bacterial pharyngitis due to β - hemolytic Streptococcus is a pathology of medical importance. Human beings constitute the natural reservoir of group A, C and G Streptococcus; Which are considered producers of pharyngitis that are transmitted from person to person by respiratory route. The present study aimed to evaluate the frequency of isolation of β - hemolytic Streptococcus in students of the School of Microbiology and Parasitology of the National University of Trujillo, from January to March, 2017._x000D_ The number of samples consisted of pharyngeal secretions of 82 students belonging to the School of Microbiology and Parasitology of the National University of Trujillo, which were inoculated in Thioglycolate fluid and seeded by the streak technique in blood agar, incubated at 37 ° C for a period of 24 to 48 hours, obtaining small, pointy, translucent and betahemolytic colonies t...