• Mihaela Videnova National Centre of Infectious and Parasitic Diseases
Keywords: sanitary parasitology, factors, methods


According to the World Health Organisation, more than 1.5 billion of the world population is affected by parasitic diseases caused by geohelminths. The number of persons suffering from foodborne and waterborne protozoan diseases is similar. In developed countries, including Bulgaria, systematic sanitary and parasitological studies of soil and water are the basis for monitoring and control in protecting public health. Occurrence and prevalence of human parasitic infections is determined by the peculiarities of life cycle of parasites, peculiarities of hosts as reservoir sources, the abiotic and biotic factors of the environment as a complex providing conditions for the development or sterilisation of different parasite stages, as well as socioeconomic factors that play a leading role in the whole epidemiological process.

Systematic sanitary-parasitological studies require the application of classical and novel reliable, sensitive and practical diagnostic methods that are also easy to perform, economical and efficient enough.

Author Biography

Mihaela Videnova, National Centre of Infectious and Parasitic Diseases

Department of Parasitology and Tropical Medicine


Anderson RM, May RM. Regulation and stability of host-parasite population interactions. 1. Regulatory processes. J Animal Ecol. 1978; 47(1):219-247.

Cheng, TS, (1986). General Parasitology. Academic Press, Inc. Orlando, Florida, ISBN: 0-12-170755-5, 827 pp.

Chappell, LH, (1993). Physiology and nutrition. Modern Parasitology: A Textbook of Parasitology, Second Edition, 157-192.

Feachem, RG, Bradley, DJ, Garelick, H. and Mara, DD, (1983). Sanitation and Disease: Health Aspects of Excreta and Wastewater Management. John Wiley and Sons, Chichester, UK.

Wharton DA. Ascaris sp.: Water loss during desiccation of embryonating eggs. Exp Parasitol. 1979; 48:398-406.

Nolf LO. Experimental Studies on Certain Factors influencing the Development and Viability of the Ova of the Human Trichuris as compared with those of the Human Ascaris. Am J Hyg. 1932; 16(1):288-322.

Cram EB. The Influence of Low Temperatures and of Disin-fectants on the Eggs of Ascaris lumbricoides. J Agric Res. 1924; 27(3):167-175.

Parsell DA Lindquist S. (1994) Heat shock proteins and stress tolerance. In: The biology of heat Shock Proteins and Molecular Chaperones, edited by RIMorimoto, A.Tissieres and C.Georgopoulos: 457-495. Cold Spring Harbor Lab Press.

Barrett J. Studies on the induction of permeability in Ascaris lumbricoides eggs. Parasitol. 1976; 73:109-121.

Hollaender A, Jones MF, Jacobs L. The effects of monochromatic ultraviolet radiation on eggs of the nematode, Enterobius vermicularis. I. Quantitative response. J Parasitol. 1940; 26:421-432.

Allan GS, Wharton DA. Anhydrobiosis in the infective juveniles of Trichostrongylus columbriformis (Nematoda Trichostrongylidae). Int J Parasitol. 1990; 20:183-192.

Atkinson HJ. (1980) Respiration in nemathods. In Nematodes as Biological Models, Vol.2, ed by BM Zuckerman, pp 101-142, New York & London Academic Press.

Hass DK, Todd AC. Extention of a technique for hatching ascarid eggs in vitro. Am J Vet Res. 1962; 23:169-170.

Anya AO. Experimental studies on fisiology of hatching of eggs of Aspiculuris tetraptera Schulz (Oxyuroidea; Nematoda). Parasitol. 1966; 56:733-744.

Kiff RJ, Lewis-Jones R. (1984) Factors that govern the survival of selected parasites in sewage sludges. Sew. Sludge Stabilisation Disinfect. Ellis Horwood Ltd., Chichester, Engl. 1984.p 452-461, fig 3, 18 ref.

Reimers RS, Little MD, Akers TG, Henrigues WD, Badeaux R, McDonnell D, Mbela K. (1990). Persistence of pathogens in lagoon-stored sludge. Available from USA Env.Prot. Agency, Risk Red. Eng. Lab, Cincinnati, EPA / 600 / S2-89 / 015 Jan 1990.

Perry, RN (2002) Hatching. In The biology of Nematoses Ed.DLLee, CRC Press, ISBN 0-415-27211-4, 147-169.

Buckley J, Clapham P. The Invasion of Helminth Eggs by Chytridiacean Fungi. J Helminthol. 1929; 7 (1):1-14.

Sobenina GG. (1978). Study of the effect of some fungi on the embryogensis and survival of Ascaris ova. In: Helminthology Abstract Series A, 47 (10): 440.

Lysek H, Bacovsky J. Penetration of ovicidal fungi into altered eggs of Ascaris lumbricoides. Folia Parasitol (PRAHA). 1979; 26:139-142.

Asitinskaya SF (1979) The role of freshwater gastropods in removing Ascaris eggs from water. Abstr. Helminthology. Abstr. Ser. A 48, 89.

USEPA-US Environmental Protection Agency. 2003. Control of Pathogens andVector Attraction in Sewage Sludge. EPA 815-R-06-002.

WHO (World Health Organization), (2006) Guidelines for the Safe Use of WastewaterExcreta and Greywater, vol. 4. World Health Organization, Geneva.

Maya C, Torner-Morales FJ, Lucario ES, Hernández E, Jiménez B. Viability of six species of larval and non-larval helminth eggs for different conditions of temperature, pH and dryness. Water Res. 2012; 46:4770-4782.

Katakam KK, Mejer H, Dalsgaard A, Kyvsgaard NC, Thamsborg SM. Survival of Ascaris suum and Ascaridia galli eggs in liquid manure at different ammonia concentrations and temperatures. Vet Parasitol. 2014; 204:249-257.

Bowman DD, Little MD, Reimers RS. Precision and accuracy of an assay for detecting Ascaris eggs in various biosolid matrices. Water Res. 2003; 37:2063-2072.

Yanko WA (1987) Occurrence of Pathogens in Distribution and MarketingMunicipal Sludges. EPA-600 / 1-87-014 National Technical Information Service, Springfield, Virginia.

Benti G, Gemechu F. Parasitic contamination on vegetables irrigated with Awash River in selected farms Eastern Showa, Ethiopia. J Parasitol Vector Biol. 2014; 6:103-109.

De Victorica J, Galvan M. Preliminary testing of a rapid coupled methodology for quantitation / viability determination of helminth eggs in raw and treated wastewater. Water Res. 2003; 37:1278-1287.

Karkashan A, Khallaf B, Morris J, Thurbon N, Rouch D, Smith SR, Deighton M. Comparison of methodologies for enumerating and detecting the viability of Ascaris eggs in sewage sludge by standard incubation-microscopy, the BacLight Live / Dead viability assay and other vital dyes. Water Res. 2015; 68:533-544.

Oksanen A, Eriksen L, Roepstorff A, Ilsoe B, Nansen P, Lind P. Embryonation and infectivity of Ascaris-suum eggs ea comparison of eggs collected from worm uteri with eggs isolated from pig feces. Acta Vet Scand. 1990; 31:393-398.

Ayres RM, Mara DD. (1996) Analysis of wastewater for use in agriculture. A laboratory manual of parasitological and bacteriological techniques. World Health Organization, Geneva, Switzerland.

Amoah ID, Singh G, Stenström TA, Reddy P. Detection and quantification of soil-transmitted helminths in environmental samples: A review of current state-of-the-art and future perspectives. Acta Trop. 2017; 169:187-201.

Gomez-Couso H, Freire-Santos F, Amar CFL, Grant KA, Williamson K, Ares-Mazas ME, McLauchlin J. Detection of Cryptosporidium and Giardia in molluscan shellfish by multiplexed nested-PCR. Int J Food Microbiol. 2004; 91:279-288.

Ishiwata K, Shinohara A, Yagi K, Horii Y, Tsuchiya K, Nawa Y. Identification of tissue-embedded ascarid larvae by ribosomal DNA sequencing. Parasitol Res. 2004; 92:50-52.

Van Frankenhuyzen JK, Trevors JT, Lee H, Flemming CA, Habash MB. Molecular pathogen detection in biosolids with a focus on quantitative PCR using propidium monoazide for viable cell enumeration. J Microbiol Methods. 2011; 87:263-272.

Reimers RS, Little MD, Englander AJ, Leftwich DB, Bowman DD, Wilkinson RF (1981). Parasites in southern sludges and disinfection by standard sludge treatment. EPA 600 / 2-81-160.

Bass D, Stentiford GD, Littlewood DTJ, Hartikainen H. Diverse applications of environmental DNA methods in parasitology. Trends Parasitol. 2015; 31:499-513.

Valero MA, Perez-Crespo I, Periago MV, Khoubbane M, Mas-Coma S. Fluke egg characteristics for the diagnosis of human and animal fascioliasis by Fasciola hepatica and F. gigantica. Acta Trop. 2009; 111:150-159.

Sultana Y, Jeoffreys N, Watts MR, Gilbert GL, Lee R. Real-time polymerase chain reaction for detection of Strongyloides stercoralis in stool. Am J Trop Med Hyg. 2013; 88:1048-1051.

Jordanova D, Harizanov R. (2012) Study of the prevalence of parasitic infections among the population of Bulgaria transmitted through contaminated food and water for the period 1995-2009. V th National Scientific Conference of the Bulgarian Focal Point of EFSA, Abstract book: pp. 13-14.

Georgieva DA, Prelesov P, Koynarski V. Parasitological study of soil and sand samples from different regions of Stara Zagora. Bulg J Vet Med. 1999; 2(2-3):125-130.

Georgieva D, Kirkova H, Ivanov A, Chakurova B, Chakurova P, Freedman P, Petkov D. Induced morbidity in children. Parasitological study of laygrounds in the city Stara Zagora. Pediatrics. 2005; 35:23-26.

Muhtarov M, Rainova I, Tamarozzi F. Treatment of Hepatic Cystic Echinococcosis in Patients from the Southeastern Rhodope Region of Bulgaria in 2004–2013: Comparison of Current Practices with Expert Recommendations. Am J Trop Med Hyg. 2016; 94(4):900-905.

Popova-Daskalova G. (2018). “Clinical, Diagnostic and Therapeutic Studies of Cystic Echinococcosis” PhD Thesis. Medical University Plovdiv.

Videnova M, Tsvetkova N, Borisova R, Raynova I, Harizanov R, Ivanova A. (2018) Sanitary-parasitological studies for the presence of parasitic protozoans and helminths in samples from Sofia and other regions of Bulgaria. 16th National Congress of Clinical Microbiology and Infections of the Bulgarian Association of Microbiologists 16-18 April 2018, Sofia. Abstract book, p. 65.

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