WappenAndreas Hassl
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The intention

Table of contents:


In this chapter the current activities of the office Micro-Biology Consult Dr. Andreas Hassl are to be presented. This compilation describes and delimits the fields of professional competence. The purpose is to assist contractors of expert opinions during the preparation for a selection of an expert - and thus to prevent both sides with embarrassing allegations because of the lack of necessary abilities before the contract conclusion. All persons able to make a substantial contribution to these fields of competence or to bring in their thoughts and ideas are invited with pleasure to contact me (by e-mail or telephone).

M2.1 Hygiene and Vivaristic

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Fig. 1: A frog with Weeksella-colonized finger cysts © A. Hassl.

In the cities of the industrial nations more and more exotic pet animals, in particular reptiles, are held. These wild animals kept in captivity, their fodder organisms, usually rodents and insects, and the human nurses and contact people form a new reservoir for those microorganisms, which are able to infect any of these host taxa. Representatives of this group of microorganisms are found in the free-living, opportunistic amoebas, the staphylococci, Weeksella and Salmonella, and also in the genus Cryptosporidia. A reduction of this microbial flora dangerous for man and animals by practicable hygienic processes was a central request of the office Micro-Biology Consult Dr. Andreas Hassl. The office sees itself as an advisory partner and service company for owners of exotic pets. The following issues were dealt with in detail:


M2.2 Infectious Disease Ecology & Microbiological Conservation Medicine

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Fig. 2: The intersection. © A. Hassl.

My special interests are focusing on a registration and a risk assessment of diseases caused by mostly opportunistic behaving infectious microorganisms associated with the keeping of amphibians and reptilians. My special interest lies with the microbiology and the hygienic problems of the intersection man - exotic pet animal - feeder organisms - terrarium. The microbiological fauna of this intersection is characterised by the appearance of a special type of infectious microorganisms, in most cases these microorganisms can infect a wide variety of hosts and they cause opportunistic infections. These ill-defined groups of microorganisms only colonize or transitionally infect an immunocompetent host. But it may cause even lethal disease in an immunologically debilitated animal or man, in rare cases even in amphibians, reptilians, fodder animals and man mutually. The following issues were dealt with in detail:


M2.3 Parasite detection in waters and environmental samples

Bild-Cryptosporidia-in Lower Austria

Fig. 3: Cryptosporidia-findings in Lower Austria. © A. Hassl.

Lamblia- and Entamoeba-cysts as well as Cryptosporida- and Toxplasma gondii-oocysts are stages of life of microorganisms pathogenic for man and domestic animals, which may be transmitted to new hosts by drinking water, water for human consumption, and mud. Usually waterborne diseases are considered as problems of undeveloped countries with inadequate sanitary practices. There is, however, an increasing recognition of the Central European, industrialized countries public health problems caused by use of only partially or insufficiently treated domestic waters, emanating from the public water supplies. Especially waterborne microbial diseases, one and a half century ago expected to be eliminated as public health problems, not only remains the leading cause of death worldwide, but the spectrum of disease is expanding and the incidence of many waterborne microbial diseases is increasing. The detection of such microorganisms, their species differentiation, and the finding of their virulence and aliveness, usually by means of gene technology, are developments, which were run in particular in the late Clinical Institute of Hygiene and Medical Microbiology of the Medical University Vienna as a public service mandate. The following issues were dealt with in detail:


M2.4 Opportunistic microorganisms in amphibians and reptiles

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Fig. 4: An Oocyst of an Apicomplexa. © A. Hassl.

The longer life expectancy of captive amphibians and reptiles as well as the increased stress of free-living specimen of these groups of animals by environmental impacts lead to the occurrence of immunosuppression in these animals. This phenomenon and the modifications in the intermediate host fauna clear the way for the establishment of opportunistic microorganisms, eg amoebas, mycobacteria, blood parasites and of exotic, imported parasites. The main emphasis of my studies is focused on the colonisation of amphibians with opportunistic microorganisms. The following issues were dealt with in detail:


M2.5 Faunistic studies

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Fig. 5: Herpetophagic ticks in Austria. © A. Hassl.

The determination of the biological species of the pathogen of a parasitosis or a parasite-infection and of the causative agent of a hygienic problem and the consultation of the client over fight and avoidance are the most important pillars of the activity of the office Micro-Biology Consult Dr. Andreas Hassl. As the microbial fauna of man and (pet-)animals in Eastern Austria is known only fragmentarily still, epidemiological questions are important contributions to the hygiene. In particular, the determination of molesting insects and other arthropods and the risk assessment of infestations with arthropods are fundamental working areas of the office Micro-Biology Consult Dr. Andreas Hassl. The following issues were dealt with in detail:


M2.6 Archeomicrobiology

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Fig. 6: An egg of a helminth in the borrow of a pit latrine. © A. Hassl.

The making of snap-shots of historic-infectious diseases and the evaluation of their significance for the process of historical events are particularly challenging research directions. It unites humanistic and scientific questions and attempts of explanation. Infections are one of the most important factors in the development of mankind and the evolution of the defence against disease-causing agents, more exactly the evolution of immunological self-recognition, is driving force behind the emergence of new species, man and his specific parasites (s.l.) also. Therefore questions from the field archeomicrobiology are a scientific passion of the cooperating workers of the office Micro-Biology Consult Dr. Andreas Hassl. The following issues were dealt with in detail:


M2.7 Law and (Micro-)Biology

Bild-The Logo of the legal cursus

Fig. 7: The Logo of the legal cursus. © A. Hassl.

Rights serve the performance of the society and they affect the values and they are affected by the units of value of the community. Therefore the conceptions of the society, how problems in species-, animal- and environmental protection can be solved, depend on the law inventory. This inventory is adapted sequentially to changing units of value - the combination of rights and biology obviates economically expensive and socio-politically undesirable erroneous trends. Laws must meet scientific facts, if they do not, they are wastes of economic resources. During the formulation of a law the legislation depends on the realizations of science. The creation of a relation between the two ranges is a special feature of the office Micro-Biology Consult Dr. Andreas Hassl. The following issues were dealt with in detail:


M2.8 Manufacturing and trade

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Fig. 8: A poster out-of-own-production. © A. Hassl.

The office Micro-Biology Consult Dr. Andreas Hassl produces some microbiological specialities: microscopic slides, antigens for allergy testing, a remedy for the intestinal flora, posters, and reprints. Moreover, food, animal feeding stuff and hunting products are manufactured and sold.