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Dominant protein antigens of Toxocara canis
Skulinová, Kateřina ; Kašný, Martin (advisor) ; Panská, Lucie (referee) ; Vadlejch, Jaroslav (referee)
Larval toxocarosis is a worldwide widespread zoonosis occurring in developed countries as well as developing countries. The disease is caused by roundworms of the genus Toxocara, primarily intestinal parasites of dogs, cats and other animals. Viable eggs released into the environment with the dog's faeces can infect not only definitive hosts, but also paratenic hosts, which include many vertebrates, some invertebrates, and also humans. In humans, larval migration can cause severe and irreversible tissue damage, which is characterized by various clinical forms of the disease. For the purposes of routine diagnosis of larval toxocarosis, the most frequently used method so far is ELISA and Western blot, which enable the reaction demonstration of specific antibodies with the larval excretory-secretory product (TES). TES is obtained for diagnostic purposes from larvae cultured in nutrient medium. The preparation of such an antigenic mixture is very laborious and may vary across the laboratories. Current research in the field of diagnosis of larval toxocarosis is therefore focused on the standardization of serodiagnostic procedures. A fundamental prerequisite is knowledge of the detailed composition of TES, especially antigenic (protein) molecules. However, the number of studies devoted to the...
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Immune response of the paratenic host to Toxocara canis infection, possible influence on the course of experimental autoimmune encephalomyelitis
Novák, Jan ; Horák, Petr (advisor) ; Fajfrlík, Karel (referee) ; Ditrich, Oleg (referee)
i Univerzita Karlova 1. lékařská fakulta Studijní program: Doktorské studijní programy v biomedicíně Studijní obor: Biochemie a patobiochemie RNDr. Jan Novák Imunitní odpověď paratenického hostitele na infekci Toxocara canis, možné ovlivnění průběhu experimentální autoimunitní encefalomyelitidy Immune response of the paratenic host to Toxocara canis infection, possible influence on the course of experimental autoimmune encephalomyelitis Abstrakt dizertační práce Školitel: prof. RNDr. Petr Horák, Ph.D. Konzultant: prof. RNDr. Libuše Kolářová, CSc. Praha, 2022 ii ABSTRACT The most complex interactions between host and infectious agent are generated during helminth infections, which represent a significant source of serious health problems worldwide. Because many helminths migrate after entering the host, these infections are characterized by the gradual development of a range of clinical symptoms. These are not only due to the damage to various organs but also to the modified host's immune response. The published studies show that, on the one hand, the immune response is stimulated in order to eliminate the parasite, but on the other hand, helminths possess a number of mechanisms that may lead to immune modulation and thus ensure their long-term survival in the host. An indirect consequence of such a...
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Seroprevalence of Cryptosporidium spp. in the human population
KUTSYNA, Valeriy
In 2018 - 2020, 1366 samples of serum from immunocompetent patients, including 860 sera from the Czech Republic and 506 sera from Ukraine, were collected and examined by an indirect ELISA test to detect specific IgG antibodies against Cryptosporidium in human population. Age, sex, and relevant data on previous cryptosporidial infections were obtained from each patient. Oocysts of C. parvum, 105 oocysts per well, were used as a corpuscular antigen. Blood serum samples and secondary antibodies were diluted 1:200 and 1: 20,000, respectively. The age range of patients varied from newborn infant to 89 years old. A total of 639 male and 709 female patients were examined. The resutts showed number of serologically positive patients increased with age. Moreover, females had higher seropositivity than males, regardless of nationality. Additionally, Czechs were more often positive than Ukrainians. The results showed less than 20 % of patients under 15 years of age were seropositive. In patients older than 15 years the seroprevalence ranged from 20 to 42 %, except the age group 41 - 50 years old, where seroprevalence was 50 %.
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The Persistence of Human Polyomaviruses
Blažková, Kristýna ; Drda Morávková, Alena (advisor) ; Kuthan, Martin (referee)
Despite years of research, even the most scrutinized Polyomaviruses - BK and JC - have not yet been thoroughly understood. With a number of new Polyomaviruses - KIV, WUV, MCV, HPyV6, HPyV7, TSV and HPyV9 described in the past few years, the need to understand how Polyomaviruses operate in their hosts has become even more urgent. The probable route of transmission appears to be either respiratory or faecal-oral. The initial infection occurs most likely in the early childhood or early-adolescence and is followed by a life-long persistence. The seroprevalence of Human Polyomaviruses among healthy adult population is high: BKV (81-97 %), JCV (35-69 %), KIV (55 %), WUV (69 %), MCV (25-46 %) and TSV (70-80 %). Human Polyomaviruses can cause fatal diseases in immunocompromised patients. The site of persistence in humans probably varies depending on the specific Polyomavirus. BK and JC are known to persist in kidneys and the urinary tract. Human Polyomaviruses have been detected in the lymphatic tissues, blood, respiratory, urinary, and gastrointestinal systems. It is not clear, however, if they persist in all of these sites. Mechanisms which Polyomaviruses use to establish and maintain persistent infection could include the viral miRNA and viral agnoprotein, which would result in a modulation of viral...
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The Persistence of Human Polyomaviruses
Blažková, Kristýna ; Drda Morávková, Alena (advisor) ; Kuthan, Martin (referee)
Despite years of research, even the most scrutinized Polyomaviruses - BK and JC - have not yet been thoroughly understood. With a number of new Polyomaviruses - KIV, WUV, MCV, HPyV6, HPyV7, TSV and HPyV9 described in the past few years, the need to understand how Polyomaviruses operate in their hosts has become even more urgent. The probable route of transmission appears to be either respiratory or faecal-oral. The initial infection occurs most likely in the early childhood or early-adolescence and is followed by a life-long persistence. The seroprevalence of Human Polyomaviruses among healthy adult population is high: BKV (81-97 %), JCV (35-69 %), KIV (55 %), WUV (69 %), MCV (25-46 %) and TSV (70-80 %). Human Polyomaviruses can cause fatal diseases in immunocompromised patients. The site of persistence in humans probably varies depending on the specific Polyomavirus. BK and JC are known to persist in kidneys and the urinary tract. Human Polyomaviruses have been detected in the lymphatic tissues, blood, respiratory, urinary, and gastrointestinal systems. It is not clear, however, if they persist in all of these sites. Mechanisms which Polyomaviruses use to establish and maintain persistent infection could include the viral miRNA and viral agnoprotein, which would result in a modulation of viral...
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Toxoplasma gondii manipulation in the host
Dittrichová, Anna ; Langrová, Iva (advisor) ; Nechybová, Stanislava (referee)
The aim of this bachelor thesis is to collect so far discovered findings about manipulation of behaviour caused by Toxoplasma gondii. The first part of this thesis introduces basic characteristic of the parasite and toxoplasmosis, which is a disease caused exactly by this parasite. In the second part we summarize outcomes of many different scientific essays that deal with manipulation of intermediate host behaviour. Toxoplasma gondii is a widespread parasite that can modify the behaviour of the intermediate host, which can lead to serious changes in psychological profile of infected people. Toxoplasmosis is one of the most common zoonosis in the Czech Republic, the prevalence reaches 25-30 %. Toxoplasmosis is usually an asymptomatic infection, however it modifies the behaviour and acting of the intermediate host in some special situasions, it also changes excretion of important substances and affects the secondary sex ratio too. Toxoplasmosis is a very important risk especially for imunodeficit people and pregnant women. The principle of prevention is very strict personal and food hygiene.
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