Dr. Kassai Tibor - Dr. Murai Éva szerk.: Parasitologia Hungarica 6. (Budapest, 1973)

Parasit. Hung. 6. 1973. Seasonal Incidence of Larval Hydatigera taeniaef or mis Infection of Microtus arvalis in Hungary Gábor NECHAY Central Plant Protection and Quarantine Laboratory of the Ministry of Agriculture and Food, Laboratory of Rodents, Tanakajd "Seasonal Incidence of Larval Hydatigera taeniaeformis Infection of Microtus arvalis in Hungary" - Hechay, G

. - Parasit. Hung. 6. 117-130. 1973. On the basis of parasitological investigation of 3097 field mice the frequency of Hydatigera taeniaeformis infection was found to be 7.2 %. Seasonal studies revealed a peak of infection in the winter and spring, while a drop in infection rate was noted during the summer. In animals living in lucerne fields, a maximal rate of infection is reached already in the autumn months, while it only takes place during next spring in those living in wheat fields. The frequency of strobilocercosis shows correlation with the age distribution of the investigated population. Taking the time, necessary for the development of cysts and the infection rate of mice into consideration, certain demographical conclusions can be reached. Hydatigera taeniaeformis Batsch, 1786 (syn.: Taenia taeniae

for- mi s Batsch) is common in small rodents. In the rodents as intermediate hosts the larval form of this "

Strobilocercus fasci- olaris

" is to be found in the liver tissue with infective larvae in cysts of 8-10 mm diameter. The house and wild cats are the principal hosts. Other predators have not been found as principal hosts in Hungary. The parasite is endemic in Hungary and has been reported by KOTLÁN (1961), EDELÉNYI and SZABÓ (1963

ï they report only the adult form in wild cats), NEMESÉRI and HOLLÓ (1972), KOTLÁN and KOBULEJ (1972), MURAI (1972), MURAI & TENORA (1973). KOTLÁN and KOBULEJ, NEMESÉRI and HOLLÓ have reported it as a common parasite of cats demanding veterinary attention and at the same time reported the host role of house mice and rats. MURAI and 117