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Prof. G. D. Vassilev

Associate Professor


Prof. G. D. Vassilev
DPhil in Veterinary Parasitology (Higher Institute of Veterinary Medicine and Zootechnics, Sofia, Bulgaria); Doctor of Veterinary Medicine, Faculty of Veterinary Medicine, Sofia, Bulgaria); Degree in Veterinary Medicine (Faculty of Veterinary Medicine, Sofia, Bulgaria)
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Areas of Specialization: Veterinary Parasitology (Helminthology)
Research Interests: Helminthology

Profile
Professor G Vassilev is a Lecturer in Veterinary Parasitology with the Department of Paraclinical Veterinary Studies. He joined the UZ in 2005. His area of specialization and research interest is Veterinary Parasitology (Helminthology). Prof Vassilev has 76 Publications in accredited Journals; and has authored and co-authored 8 Veterinary Science Textbooks. He worked for Government Veterinary Services (Zimbabwe) for twelve years as Head of Section, Helminthology. He also worked for thirty years in the respective capacities of Associate Professor, Senior Lecturer and Lecturer at the Higher Institute of Veterinary Medicine and Zootechnics, Sofia / Stara Zagora, Bulgaria. He was a District Veterinary Offeicer, Elchovo, Bulgaria, in the early stages of his Veterinary profession.

Research Publications
Articles in Bulgarian Language – Corresponding English Version
1. Pavlov P, Tatarov B, Lazarov E, Stoev P, Vassilev GD (1960). The efficacy of O’Cresol on the Coccidies. Ann. High. Agr. Inst., 10: 209-217
2. Pavlov P, Tatarov B, Lazarov E, Stoev P, Vassilev GD (1960). Studies on the viability of Trichocephalus ovis eggs in ensilaged fodder. Ann. High. Agr. Inst., 10: 478-485
3. Pavlov P, Vassilev GD (1961). The efficacy of Tetrachlormethanim in sheep treatment against F. hepatica Infection. Ann. High. Agr. Inst., 11: 90-99
4. Vassilev GD (1961). Forage ensilaging as a method for control of some helminths. Vet. Sbirka, 8: 12-13
5. Pavlov P, Vassilev GD (1961). An incidence of not typical localization of Strongyloides papillollosus. Ann. High. Agr. Inst., 11: 249-252
6. Pavlov P, Vassilev GD, Stoev P (1962). Studies on the viability of Nematodes spathiger (Raulliet, 1896) ova in ensilaged fodder. Ann. High. Agri. Inst., 12: 143-148
7. Vassilev GD (1963). A study on the therapeutic efficacy of Cyanaethydracid and a solution of Iodine against Dictyocaulus filarial infection in sheep. Ann. High. Agri. Inst., 14: 267-273
8. Vassilev GD (1963). Non-specific serological reactions upon Pullorum disease in vitamin deficient Gallinaceous. Ann. High. Agri. Inst., 13: 331-337
9. Tatatov B, Lazarov E, Vassilev GD (1964). The therapy of ovine fasciolosis with Ursofasciol. Ann. High. Agri. Inst., 15: 275-280
10.Grigorov St. I, Nashev P, Vassilev GD (1964). A study on the toxicity of Rye-grass treated with Metasystox. Ann. High. Agri. Inst., 14: 89-96
11.Tatatov, B, Georgiev Is, Lazrov E, Vassilev GD (1964). Cases of Zinc-deficiency in swine and poultry. Ann. High. Agri. Inst., 14: 634-642
12.Petrov D, Vassilev GD (1965). Trials in early therapy of bovine hypodermosis. Vet. Sbirka, 3: 10-13
13.Pavlov P, Popov At, Bankov D, Bratanov V, Vassilev GD (1966). Therapy of ovine dicrocoeliosis with Hetolin. Ann. High. Agri. Inst., 16: 325-331
14.Vassilev GD (1966). A toxicological study on some sorts of Lupinus spp. Ann. High. Agri. Inst., 16: 299-307
15.Vassilev GD (1966). Prevention of turkeys from injury on the back. Jivotnovodtvo, 1: 33-35
16.Pavlov P, Vassilev GD (1966). The therapeutic efficacy of Certuna and Franocid against Dictyocaulosis in sheep. Ann. High. Agri. Inst., 16: 287-293
17.Vassilev GD, Kancheve L (1967). A new drug in treating Fasciolosis in sheep. Vet. Sbirka, 1: 19-21
18.Pavlov P, Vassilev GD, Stanskushev CHR, Sartmadjiev KR (1967). Stachybotryotoxicosis of sheep in Bulgaria. Vet. Me. Nauki, IV, 9: 49-54
19.Vassilev GD (1967). Content of Crouton-oil in the local breeds of Brassica napus. Ann. High. Agri. Inst., 17: 167-176
20.Tatarov B, Lazarov E, Vassilev GD, Kancheve L, Kostov G (1968). Perosis in chicks treated with Anticoccidial drugs. Ann. High. Agri. Inst., 19: 242-252
21.Tatarov B, Lazarov E, Vassilev GD, Kanchev L (1968). Industrial Flurosis in cattle and sheep in Bulgaria. Vet. Med. Nauki, V. 7: 29-34
22.Pavlov P, Vassilev GD, Bratanov V (1968). Viability of Echinococcus granulosus and Multiceps multiceps eggs in ensilaged fodder. Vet. Med. Nauki, V. 8: 67-73
23.Tatarov B, Vassilev GD,Lazarov E, Kancheve L (1969). Studies on the industrial Flurosis in cattle and sheep. Vet. Sbirka, 5: 38-41
24.Vassilev GD (1970). The effect of gastrointestinal Trichostrongylidae infection in sheep on the quality of the wool. Vet. Sbirka, 12: 19-22
25.Vassilev GD (1971). A quantitative diagnostic method of the helminth ova and larvae in faecal samples. Vet Sbirka, 4: 19-23
26.Popov At, Bankov D, Vassilev GD (1971). Studies on the anthelmintic activity of 2-acetoxy-3brom-5-chloro-N-(4 Bromphenyl) Thiobenzamide, (1971). VII-th Int. Cong. Chemotherapy, Prague, Czech Rep. Vol. I, A/24, 23-28.
27.Vassilev GD (1971). The gastrointestinal parasitism in pigs raised on commercial scale. Vet. Sbirka, 2: 20-22
28.Lazarov E, Tatarov B, Vassilev GD, Kancheve L (1971). The Influence of zinc on immunogenesis in swine. Ann. High. Agri. Inst., 22: 239-245
29.Vassilev GD, Nickel S (1971). Group deworming of sheep against mixed Trichostrongylide infection. Vet. Sbirka, 10: 11-18
30.Vassilev GD (1973). Methods for the objective evaluation of the efficacy of anthelmintic drugs against gastrointestinal parasites. Vet. Sbirka, 9: 16-20
31.Lazarov E, Tatarov B, Vassilev GD, Kanchev L (1973). The influence of aluminum and calcium on the Fluor-precipitation in lamb’s bones. Ann. High. Agri. Inst., 23: 659-670
32.Lazarov E, Tatarov B, Vassilev GD, Kanchev L (1974). The Influence of MgSO4 and combination of AICI3, MgSO4 and CaC4 over the Fluor-precipitation in lamb’s bones. Jiv. Nauki, 11: 107-114
33.Lazarov E, Vassilev GD (1977). Chronic industrial Flurosis in horse. Ann. High Agri. Inst., 24: 259-166
34.Vassilev GD, Geogiev BI, Kancheva K (1975). The influence of protein ration in the sheep’s food on an experimental Infection with Fasciola hepatic XXth World Vet. Congress, Thessaloniki, Greece, 198-199
35.Vassilev GD (1981). Ecological observations on the pre-parasitic stages of Ostertagia circumcincta in Bulgaria. IX-th Conf. of W.A.A.V.P., Budapest, Hungary, 7
36.Vassilev GD (1981). Anthelmintic efficacy of Febantel against gastrointestinal nematodes in sheep. IX-th Int. Conf. of W.A.A.V.P., Budapest, Hungary, 150
37.Vassilev GD, Dimova I (1982). A study on the taxonomy of the invasive larvae of the gastro-intestinal nematodes in sheep. Ann. High Agri. Inst., 24: 203-231
38.Vassilev GD, Dimova I (1982). On the epidemiology of the gastro-intestinal nematodes in sheep. Ann. High Agri. Inst., 29: 231-236.
39.Vassilev GD, Dimova I (1982). The spring rise phenomenon in the gastrointestinal nematodes in the sheep of the Tracian Finewooled Breed. Ann. High. Inst. of Vet. Med. and Zoot, 30: 64-69
40.Vassilev GD, Dimova I (1982). The enzyme activity of pig’s blood plasma in cases of Ascaris suum infection. II-th Sci. Conf of the Agr. Academyc, 48-57
41.Vassilev GD, Dimova I (1982). Some protective reactions of pigs infected with Ascaris suum. II-th Sci. Conf of the Agr. Academyc, 57-65
42.Vassilev GD (1985). Prognostication of the seasons favorable for development of gastrointestinal nematodes in sheep in various regions of Bulgaria. Vet. Med. Nauki, XXII, 3: 69-76


Articles in English
43.Vassilev GD, Madzima WN (1990). Anthelmintic resistance in gastrointestinal nematode parasites of ruminants in Zimbabwe. Proceedings of the Second Symposium on Science and Technology, 1990, Harare, Vol, IIB: 967-991.
44.Vassilev GD, Madzima WN (1990). A brief review of cryptosporidiosis in new-born calves. Zimbabwe Vet. J., 21: 159-165
45.Vassilev GD, Jooste R (1991). Production losses and control of fasciolosis in cattle in Zimbabwe. Zimbabwe Vet. J., 22: 45-56
46.Vassilev GD, Jooste R (1991). Pathology and taxonomy of Synhimantus (Dispharnc) nasuta infecting Bantams and Guinea-fowls in Zimbabwe. Bull. Anim. Hlth Prod. Afr. 39: 27-30
47.Vassilev GD (1992). Anthelmintic resistance in sheep and goat gastrointestinal nematodes and worm control strategies. Proceeding of the Annual Congress of the Zimbabwe Vet. Ass. 159-178
48.Vassilev GD (1993). Seasonal incidence of gastrointestinal parasites in sheep in Zimbabwe, Proceedings of the third Symposiums on Science and Technology, Harare, Vol, A:103-118
49.Vassilev GD (1993). Activity of ivermectin and albendazole in the control of gastrointestinal nematode parasites and growth performance of two year old beef cattle. Zimbabwe, Vet. J. 24: 121-148
50.Vassilev GD, Bingham J (1994). A first report from Zimbabwe of Filaroides myonaxes Sandground, 1937, in the slender mongoose (Galerella sangunea). Zimbabwe Vet. J., 25: 98-101
51.Vassilev GD (1994). Prevalence and seasonality of internal parasitic infections detectable by faecal examination of cattle in Chiweshe communal farming area of Zimbabwe. Zimbabwe Vet. J., 25: 41-63
52.Vassilev GD (1995). Control of haemonchosis in sheep by strategic treatment with Closantel. Zimbabwe Vet. J., 26: 33-60
53.Vassilev G. (1996). Anthelmintic resistance in gastrointestinal parasite nematodes of ruminants in Zimbabwe: Problem, current status and future prospects. DANIDA. Seminar on Ruminant Production and Helminth Infections, Harare, 9-11
54.Vassilev GD (1996). Prevalence of internal parasitic infections of cattle in the communal farming areas of Zimbabwe, DANIDA, Seminar of Ruminant Production and Helminth Infectious, Harare, 1-2
55.Vassilev GD (1996) Prevalence and geographic distribution of internal parasitic infectious of draught oxen in communal farming areas of the Mashonaland East, Province, Zimbabwe, 5th Symposium on Science and Technology, Harare, 3-4
56.Vassilev GD (1997). Prevalence and seasonal variation of internal parasitic infections of draught oxen in the Chiweshe communal farming area in Zimbabwe. Bull. Anim. Hlth. Prod. Afr., 45: 87-94
57.Foggin CM, Vassilev GD, Widdowson MA (1997). Infection with Trichinella in farmed crocodiles (Crocodylus niloticus) in Zimbabwe, 16th International Conferences of the WAAVP, South Africa, Pretoria, Abstract No. 110, 96pp
58.Vassilev GD (1997). Prevalence and importance of helminth parasites in livestock of Zimbabwe, 16th International Conferences of the WAAVP, South Africa, Pretoria, Abstract No. 328.96 pp
59.Vassilev GD (1999). Prevalence of internal parasite infections of cattle in the communal farming areas of Mashonaland East Province, Zimbabwe. Zimbabwe Vet. J., 30(1): 1-18, (http://dx.doi.org/10.4314/zvj.v30i1.5340)
60.Monicat F, Vassilev GD, Borne PM (1999). Caprine gastrointestinal parasitism of smallholder farms in Zimbabwe, 17thInternational Conference of the WAAVP, Copenhagen, Denmark, Abstract. 6, 31
61.Vassilev GD (1999). Survey of Trichinella spp. infection in pigs from commercial piggeries in Zimbabwe. Rev. Sci. tech. off. int. Epiz., 18: 753-757
62.Vassilev GD (2000). Fasciolosis of ruminants – Control with Albendazole, Monograph, Harare, Zimbabwe, 26pp
63.Vassilev GD, Bruce D. The production and economic benefits of deworming grazing weaner beef calves using pulse release bolus or an oral suspension of Oxfendazole, Zimbabwe, Vet. J.

Articles in German and Other languages
64.Vassilev GD (1965). Untersuchenge uber die Wirksamkeir von Hetolin bei de Infection der Schafe mit Dicrocoelium dendiriticum. Tieratzliche Umschau, 12: 574-579
65.Tatarov B, Lazarov E, Vassilev GD, Kancheve L (1968). Industrielle Flurose bein den Rindern in Bulgarien, V. Int. Tagung uber Rinderkrankheiten, Opatija Jugoslabija, 1093-1099
66.Pavlov P, Vassilev GD, Bratanov V (1969) Lebensfahigkeit der Eier von Echinococcus granulosus and Multiceps multiceps in Silage. Tierarztliche Umschau, II: 359-545
67.Vassilev GD (1969). Die veterinarmedizinische Parasitologie in der Volksrepublik, Bulgarien. Monatshefte fur Veterinarmedizin, 11: 431-434
68.Vassilev GD, Kantschev L (1970). Die Helung der Leberegelseuche mit Bilevon-M. Veterinarmedizinische Nachrichten, 1: 13-17
69.Nickel S, Vassilev GD, Hiepe Th (1971). Tetramisol gegen Magen-Darm-Strongylata Schafen. Angewandte Parasitologie, 1: 2-10
70.Vassilev GD (1971). Einflusss der Askaridose auf die Broilerproducktion. Monatshefte fur Veterianrmedizin, 14: 543-544
71.Vassilev GD (1971). Feldversuch mit Bay Va zur Behandlung des Lebergelbeffals (F. hepatica) bei den Schafen, Vortrag, VII Int. Cong. Of Chemotherapy, Prague, A-6/25
72.Lazarov E, Tatarov B, Vassilev GD, Kantschev L, Kovatchev (1972). Knochenveranderrungen bein ein chronischer industrieller Fluorose erkrankten Kuhen. Wienr Tierarztlicher Monatsschrift, 59(8/9): 258-263
73.Enigk K, Dey-Hazra A, Vassilev GD (1973). Beeinglussung der Enzymsaktivitat der Dunndarmschleimhau durch Strongyloidse befall beim Schwein, Zentralblat der veterinarmedizin, B, 20, 798-809.
74.Vassilev GD, Stankov I, Dimova I (1982). Die Wirkasamkeit von Rintal genen Magendaemnematoden beim Schaf. Veterinarmedizinische Nachrichten, 1: 66-75
75.Vassilev GD (1984). Uber die Bekemmpfung von Magen-Darm-Namatoden beim Schaf, X haupttagung der Parasitologischen Gesellschaft der DDR, Reinhardsbrunn, DDR, 28-36.
76.Pavlov P, Tatarov B, Lazarov E, Stoev P, Vassilev GD (1961). Skumaine zivotaschophostic neembrioonovanich a embrioonobanych vajicok Trichostrongylus ovis Veterinarysky casopis, 10(3): 266-272

Books
1. Vassilev GD (1976). Diseases of domestic animals in the Tropic and Subtropics, Sofia, Bulgaria, 236 pp
2. Vassilev GD (1981). Diseases of domestic animals in the Tropic and Subtropics, Sofia Bulfasria, 1981, 226 pp. (II reviewed edition)
3. Lazarov E and Vassilev GD (1964). Manual of Veterinary Parasitology for Students, Sofia, Bulgaria, 162 pp., 108 illustrations
4. Lazarov E, Vassilev GD and Kancheve L (1969). Manual of Veterinary Parasitology for Students, Sofia, Bulgaria, 139 pp, 81 illustrations
5. Vassilev GD and Dimanov D (1980). Manual of Veterinary Parasitology for Students for Students, Sofia, Bulgaria, 101 pp. 46 illustrations
6. Vassilev GD and Dimanov D (1987). Manual of Veterinary Parasitology for Students, Sofia, Bulgaria, 136 pp, 56 illustrations) II reviewed edition)
7. Vassilev GD (1987). Manual of Diseases of Domestic Animals in the Tropic and Subtropics for Students, Sofia, Bulgaria, 106 pp, 71 illustrations
8. Vassilev GD (1987). Diseases of Domestic Animals in the Tropic and Subtropics, Sofia, Bulgaria, 266 pp, (III reviewed edition)

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