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

seems that E. gingivalis is 20 # more frequent than T« tenax in Budapest also. Of the 352 males and 389 females examined, 77.6 # of the former and 73.3 $> of the latter were infected by mouth protozoa. The occurrence of only one species of the respective protozoa was more frequent in males (males:

44.9 i°, females:

35.2 $), dual occurrence was slightly more frequent in females (females: 38.1 males 32.7 *). Data were also grouped according to age (Table l). With due attention to the physiological and pathological state of the teeth - e.g. complete eruption of the permanent teeth, stagnation, ageing - three age groups were formed: 1-20 years, 21-40 years, and older than 41 years. Infections of 62.7 # were found in group 1, 75.6 i» in group 2, and 83 i° in group 3, corroborating the statement that the frequency of infection by mouth protozoa also increases with age. Mouth protozoa spread with the oral secretion by means of contact; most infections probably occur during adolescence (16-20 years). À similar increase in the frequency of infection was found when grouping the data according to grades.of oral hygiene (Table 2). Infection was demonstrable,in the case of healthy mucous membrane and teeth (group 0), in 63.7 $> of individuals examined, and in Table 1 The frequency of mouth protozoa according to age Szájprotozoonok előfordulásának korszerinti gyakorisága Age group Korcsoport Number of individuals . - Vizsgált személyek száma Number of infected persons - Fertőzött személyek száma * 1-20 years éves 153 96 62.7 21-40 years éves 357 273 75.6 41- years éves 231 191 85.0