L. Forró szerk.: Miscellanea Zoologica Hungarica 8. 1993 (Budapest, 1993)

Kriska, T.: Parasitic helminths of house mouse (Mus musculus Linnaeus, 1758) in Hungary

Geographical distribution: Europe, Asia, North America; the taxonomical and geographical status of M. s. ssp. occidentalis Murai, 1974 need further investigations. Description: Body length 80-200 mm, maximum width 2-3.5 mm. Diameter of scolex 0.32-0.37 mm, of suckers 0.10-0.12 mm. Number of testes 37-70. Ovary 0.30.4 mm, vitellary gland 0.12-0.13 mm in diameter. Eggs spherical or elliptical, 0.040-0.060 mm in diameter. Oncosphere 0.035-0.040 mm, lenght of embryonal hooks 0.014-0.016 mm. Localities: 10. Nagykovácsi, two cases, January, two cases, February, one case, March, one case, June, one case, August, two cases, September, two cases, October, three cases, November; 11. Budapest, one case, October, Óbuda, one case, June, Pestlőrinc, one case, August; 14. Gyöngyös, two cases, August; Gyöngyöshalász, two cases, August. 3.5 percent of host population was infected by M. symmetrica, the intensity of infection was 6.9. The levels of prevalence by seasons were: 6.4% in winter, 1.0% in spring, 6.9% in summer and 2.7% in autumn. Nematoda Trichocephalidae Baird, 1853 Trichocephalus muris Schrank, 1788 Syn.: Trichuris muris (Schrank, 1788) Hall, 1916 Localization: caecum, large intestine Geographical distribution: cosmopolitan Description: Male: Body length 14-27 mm, maximum width 0.25-0.52 mm. Esophagus length 8.8-18.7 mm. Spiculum 0.57-0.73 mm long (Fig. 2). Female: Body length 14.6-36.5 mm, maximum width 0.4-0.6 mm. Esophagus length 9.6-20.7 mm. Distance of vulva 9.6-17.1 mm from anterior end. Anus 0.150.20 mm from posterior end. Eggs barrel-shaped 0.059-0.066 x 0.028-0.034 mm (Fig- 3). Localities: 2. Kapuvár, two cases, April; 6. Farkasgyepü, two cases, November, Nagyvázsony, one case, May; 7. Fonó, seven cases, September, four cases, November; 9. Aranyosgadány, one case, October; 10. Nagykovácsi, one case, January, two cases, February, one case, March, two cases, April, one case, May, one case, June, one case, July, one case, August, two cases, September, four cases, October, five cases, November, two cases, December; Érd, one case, February; 11. Nagytétény, two cases, September, Óbuda, three cases, June; 14. Gyöngyöshalász, one case, August; 16. Bács County, one case, October; 17. Rákos, one case, December. 8.5 percent of the host population was infected by T muris, the intensity of infection was 7.2. The levels of prevalence by seasons were: 11.3% in winter, 6.8% in spring, 5.9% in summer and 9.3% in autumn. Heligmosomidae Cram, 1927 Heligmosomoides polygyrus polygyrus (Dujardin, 1845) Railliet et Henry, 1909 Syn.: Nematospiroides dubius Baylis, 1926; Heligmosomum azerbaidjani Schachnazarova, 1949 Localization: small intestine