Dr. Kassai Tibor szerk.: Parasitologia Hungarica 1. (Budapest, 1968)

about 70 % of tbe actual infection can be shown after incubation for 24 hours,whereas in cultures incubated for 72 hours a certain decrease is to be expected owing to changes in pH values of the medium and the ageing of the amoebas. A c k n o w 1 edgement. Por his valuable support in organizing sampling, I am greatly indebted, and dedicate this paper, to the late (1966) Dr. D. KECÉRY, dental specialist of the polyclinic at Gyöngyösi ut, Budapest XIII. Summary Of the 741 residents of Budapest examined, 560 persons, i.e., 75*5 were found to be infected by oral protozoa. Cultures of Entamoeba gingivalis showed a frequency of 61.7 that of Tri chomonas tenax 38.3 In 53.4 1* of the Infected persons only one

, in 46.6 i> both, protozoa occurred; 77.6 i» of males, and 73.3 $> of females were infected. One protozoon species caused infection in 44.9 i» of males and In 35*2 # of females; both protozoa occurred together in 32.7 ^ of males and 38.1 36 of females. With advancing age or deterioration of oral hygiene, the number of infections by mouth protozoa increases (Tables 1 and 2). The author considers careful sampling the basis of reliable mouth protozoa investigations, and culture the best method of demonstrating the parasites. ARADI, M. P.: Száj protozoon- fertőzés gyakorisága Budapesten 3udapest lakosságának szájprotozoon-fertőzéséről eddig nem voltak adatok, ezért a szerző 741 budapesti személy vizsgálata alapján tiatokat szolgáltat a szájprotozoonok gyakoriságáról, továbbá a "

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rtőzés megoszlásáról nem, életkor és a szájhigiéne állapota sze-