FACE TO FACE
Year : 2013 | Volume
: 3 | Issue : 1 | Page : 89--92
An interview with Dr. M. C. Agrawal
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. An interview with Dr. M. C. Agrawal.Trop Parasitol 2013;3:89-92
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. An interview with Dr. M. C. Agrawal. Trop Parasitol [serial online] 2013 [cited 2021 May 14 ];3:89-92
Available from: https://www.tropicalparasitology.org/text.asp?2013/3/1/89/113926
Tropical Parasitology (TP): Parasitic diseases have long been branded as the diseases of developing and the under-developed countries. You have been one of the pioneers in parasitic research in India. Over the period of your long career, have you noticed any gross change in the trend of these diseases?
Prof. M. C. Agrawal: Yes! A great change in the trend of these diseases is observed over the time. I think there are two reasons for this. One is the spread of our knowledge on the subject. Hence, we become more aware about the existence of diseases in our location. Second might be the change in environment, irrigation facilities, deforestation, husbandry practices, change in vector population etc., which might have contributed in spreading these diseases to new locations.
TP: How has research in microbiology and parasitology changed in past years in terms of technicality and quality? Are the current studies better designed and better funded than those of yester years?
Prof. Agrawal: There is a tremendous change observed in research pattern of yester year and of present day. When I joined my research career in parasitology, which was the era dominated by reporting of occurrence or morphology description or life cycle of the parasite. It was fascinating to record a parasite in any unusual host or at an unusual location. However, this was also the period of realization that time is changing and persons were shifting to fields such as epidemiology, environment, pathology, biochemistry, immunology, and chemotherapy of parasitic diseases (until that time biotechnology has not emerged). Present research is better designed and funded than yester years.
TP: How would you assess the present scenario in tropical Parasitology research in India? Are the Indian laboratories well-equipped in performing newer molecular, genomic, and proteomic studies in par with the west?
Prof. Agrawal: In my opinion, the present scenario of research in tropical Parasitology in India is not good. We have failed to attract talents in Parasitology and as such research on parasites in Zoology Departments is diminishing or rather finished; neither there is any Master's program in Parasitology in any Zoology Department in India nor there is any demand from students. Hence, the case is with the Medical faculty. This is all because we have failed to create job opportunities for our young talents in this field.
The contrast to West may be assessed by the fact that many European colleges, where parasitic diseases is not the problem, are running successfully Master's and Doctorate programs in Parasitology with an international research projects. Our laboratories are not as equipped as West for research on tropical Parasitology. However, this will be a costly proposition hence I will suggest to have more national and international collaborations for obtaining better results at lower costs.
TP: Which parasitic diseases in India you think would benefit most from research and which of the diseases need more attention on research?
Prof. Agrawal: Obviously, the parasitic diseases, which are affecting larger population or more animal species, need our attention most. We may give our priority to those parasitic diseases, which are affecting our tribal population, below the poverty line persons; or parasitic diseases of swine, sheep, and goat as they are maintained by most poor people.
However, one fact should always be remembered while dealing parasites. They are having complex life cycle, having greatest capacity of modifications as per circumstances (inheriting sexual life cycle passes this quality due to cross transfer of genes) and its difficult to eliminate them without studying their complexities; mosquito is the best example, which is surviving from thousands of years and have withstood well to all our insecticides and other scientific efforts to eliminate this enemy of human life.
Again change of environmental conditions, local fauna, and human activities are leading to the emergence of new parasitic problems or some old one may emerge as more problematic. Hence, we should continuously remain watch full on emerging parasitic diseases, as well.
TP: Are the diseases, which are branded as neglected tropical diseases really neglected in India?
Prof. Agrawal: To get the answer of this question, it's better to examine what the government has carried out to control these neglected diseases? There are three fronts - education, policy decisions and execution side. The education of parasitology is imparted in three faculties; zoology, veterinary, and medical. Parasitology has completely been ignored now in Zoology Departments and no Zoology Department in India is offering M.Sc., or Ph.D., in Parasitology. No state medical colleges are having separate Department of Parasitology, but it's a small and neglected part of Department of Pathology. Veterinary colleges are having separate Departments of Parasitology, but the faculty positions are curtailed. No job opportunity is created in this discipline in any of three faculties to attract the talents.
I am not aware if important policy decisions either by the planning commission or at government level have been made along with an implementation program to control parasitic diseases in the country, leaving aside malaria. There is no scientific panel who may advise the government/departments on important parasitic diseases and how they may be dealt in the country. Neither Public Health Department nor Animal Husbandry Department has created subject specialist posts on parasitic diseases to control the infections. The parasitic diseases are tackled by either a veterinarian or medical officer with no superior post of Parasitologist in either department.
These facts reflect how parasitic diseases are neglected in the tropical country like India. To avert the situation there is a need of a National Institute of Parasitology (more details given in "The para sight issue 2" of IAAVP or see my blog), which can monitory parasitic diseases of the country.
TP: Veterinary Parasitology is a highly neglected field in our country. Considering the large zoonotic reservoir in India, what do you think on the effectiveness of control of parasitic zoonosis in India?
Prof. Agrawal: You are right in saying that parasitic diseases of animals in India have completely been neglected. Perhaps this is on the notion that they do not cause animal death hence harm to animal industry is minimum. However, sincere efforts of Parasitologists have conclusively demonstrated that parasitic diseases are not only causing debility or production losses, but are also responsible for causing slow, steady death of animals, one by one, without confirming diagnosis hence, specific treatment resulting in wiping of almost whole flock within a short period; this has been demonstrated well in ovine hemonchosis as well as in ovine schistosomiasis. This neglect is again despite that parasitic diseases neither have any vaccine to control nor have specific drugs like antibiotics for effective cure.
Parasitic zoonosis has two main components-medical and veterinary. How we can effectively control them when both are working wide apart. There is no body which can collaborate the efforts of the two or any organization which may formulate working plan and combine the work for more efficient results. Earlier, attempts were made to start degrees in Veterinary Public Health, but the absence of creating posts and a common strategy distracted the concerned persons.
As zoonotic diseases, viral, bacterial, fungal, protozoan, helminths make a large part of infectious diseases, it may be better to formulate a separate entity at government level, which may deal all these zoonotic diseases by incorporating subject matter specialists of each discipline.
TP: Can you share some of your interesting observations of animal infections rarely infesting humans?
Prof. Agrawal: During the teaching course of parasitic zoonosis to postgraduate students, I asked the PG students to examine stools of hostel students for parasitic infections. These hostellers were found positive for Hymenolepis eggs; it was later observed that the flour is mixed with positive rat feces resulting in such infections. Some students, having rural back ground, were positive for hookworm infection. This simple work showed how parasitic infections may reflect back ground history of any one.
TP: Commending your authorship in the various literary materials on helminthes in India, kindly shed some light on the burden of helminthes in our country, comparing the urban, rural and the tribal population.
Prof. Agrawal: As parasitic disease is the cumulative effect of social status, economic activities, nutritional status, behavioral differences and environment of human population, so it will naturally differ as per these parameters. Urban group is in advantage stage as it has created conditions where exposure to parasitic stages becomes minimal hence malaria has remained, perhaps, the only main problem of this elite group. However, urban population, particularly, slum dwellers are facing some more problems like amebiasis. Another problem arising is because of street dogs and their scattering fecal material, which is responsible for serious zoonotic diseases like hydatidosis, cysticercosis, toxocariasis or visceral larval migrans (not mentioning rabies as being a viral problem).
Rural population facing great problems and you may encounter all the parasitic problems, referred in our text books, but the severity of the problem may differ as per above factors. Thus, hookworms, causative agent for anemia are causing havoc to rural pregnant woman and malnourished children. Filariasis, visceral larva migrans, cercarial dermatitis, hydatidosis, cysticercosis, are increasing health problems of the rural population and it's difficult to escape from these infections due to existing environmental conditions.
Though, we have started talking separately about tribal health, it appears, in my opinion, of little value. Are we knowledgeable about their health problems or infectious diseases common in them? How many books/publications have come out dealing with tribal health in India? Can we make a generalized statement for the infections for all the tribes, existing in the country, with so much diversity? Have we started accumulating data about tribal diseases? Have we made epidemiological studies comparing tribal differences, responsible for a particular ailment? When we talk about tribes, we have to separate them in various categories (e.g., education, food habits, occupation, environment, living in isolation) to draw fruitful results.
I am aware about the Regional Medical Research Center on Tribal Health, operating at Jabalpur, Madhya Pradesh. They are working on malaria, tuberculosis, fluorosis etc., but not sure if they are collecting data on general tribal infections and all the details, thereof. As my state, Madhya Pradesh is possessing large tribal population, I am aware that our remote tribal populace is averse of contacting modern Allopathic doctors and still depend on their home healer or "Ojha" or "Gunnia." Therefore, we have to work much more for knowing their specific health problems and solutions which may be accepted by them. Their close association with their animals like swine, dog and poultry exposes them more to zoonotic diseases. Moreover, they are still more close to forest; therefore, infections like schistosomiasis, paragonimiasis, trichinellosis, angiostrongylosis etc., can attack them with more probability.
Though I am not loaded with the data, I presume that our tribal population is more severely affected with parasitic infections, looking to their social behavior, education, economic conditions, nutritional status, bad surroundings; moreover, a simple ailment, curable with the help of modern medicine (e.g., hookworm infection) may be dangerous to them due to ignorance and their no reach to the modern medicine.
TP: We applaud you for your extensive contribution to research in schistosomiasis. Can you brief us on the magnitude of this problem in India?
Prof. Agrawal: The infection appears a great problem in rural population throughout India but more so where rain fall is high and persons are still depended on tanks, water ponds for their domestic requirements. However, if you will follow western style by searching positive snails in the rivers, streams, searching egg positive human samples by routine fecal and urine examination, you will, in all probability, get negative results. This is because the intermediate hosts of Indian schistosomes are present in ponds, tanks and not in rivers and eggs are extremely difficult to detect in human excreta due to very low egg production. Moreover, the sufferers are generally persons below the poverty line such as washer man, fisherman, cultivators, laborers, shepherds, children, young girls who are most neglected strata of the society. There is another category of possible positive persons - immune-deficient, tuberculosis positive, malnourished and alike groups.
The real magnitude of the problem can be judged only when we include above category of persons in our study and start examining them not for schistosome eggs, but schistosome antigens in their excreta.
A surveillance work in Assam, Chattisgarh, Madhya Pradesh revealed about 70% rural population were either showing lesions of cercarial dermatitis or had its history with four passing schistosome antigen in their urine. As cercarial dermatitis is the first stage of human schistosomiasis, further studies are necessary to assess its full public health impact.
The magnitude is more severe in our domestic animals, but here again it depends on rain fall, temperature, geography, species, breed, age of animal, and husbandry practices, followed in the places.
Very young animals generally do not suffer because of stall feeding practice while old animals do not excrete eggs in sufficient number due to thickening of the intestinal wall. Cattle are the main reservoir host for S. indicum, and Schistosoma spindale while swine is the main reservoir for Schistosoma incognitum Nasal schistosomiasis appears more widely prevalent in India than hitherto considered. This assumption got support by finding Jabalpur like nasal schistosomiasis at other places also where the infection exists symptomless in buffaloes while local cattle appear resistant to the entity.
Schistosomiasis is prevalent in all the states of the country, affecting mainly ruminants. The infection is not causing only production losses but also outbreaks and heavy mortality, especially in sheep, but the disturbing fact is that the causative agent is not identified as schistosomes due to faulty diagnostic methods and ailment is wrongly attributed to Peste des petits ruminants (PPR) or alike viral infections. The space is limited for speaking; all my thoughts and discussions on the topic have been documented in my book "Schistosomes and Schistosomiasis in South Asia (ISBN 978-81-322-05388)" which you may follow on the website < www.Springer.com>.
TP: What are your suggestions and advice to young scientists pursuing their career in Parasitology?
Prof. Agrawal: While doing your Master's degree, please do not confine only on your thesis problem, but imbibe a holistic view of the subject by studying all aspects of Parasitology. Get mastery at least of the Parasitology text book, which is being taught - learn all the important techniques of Parasitology and do not limit only to those related to your thesis work.
When you are doing your doctorate program, critically analyze the research papers, particularly of your research problem, and find out the lacunae in designing their research program. Read critically review articles and advances of Parasitology and see why the author is reaching a particular conclusion and what may be the other possibilities.
While you are starting your research career, restrict yourself only to one topic and devote your whole life to it only as life is very short while problems are fathomless. Be a voracious reader and read more and more about the Parasitologists (e.g., www.drscdutt.com) and how they worked, may read "After 50 years of research (of Dr. SC Dutt)" on my blog www.indianschistosomiasis.blogspot.com.
If you have joined the research as a career, please do remember that the sky is the limit and this is the field where knowledge is worshiped and you may be remembered years after, for your work, which is not possible in other profession. Do not forget that human civilization has evolved only on the basis of knowledge or research.