Prof. Vsevolod A. Zinserling (Tsinzerling) graduated from Leningrad Paediatric Medical Institute in 1977, worked as research scientist, practicing as pathologist in Leningrad Research Institute of Children’s Infections (1977-1988). In 1978-80 had postgraduate training at the chair of pathology (chief. Prof. O.K. Khmelnitsky) of Leningrad Institute for Postgraduate Medical Training. 1981 defended his cand. med. sc. (Dr. med.) thesis “Brain changes in mycoplasmosis”. In 1988-92 chief of the Central Research Laboratory of Leningrad Paediatric Medical Institute. In 1988 defended the doct. med. sci. thesis “Brain lesions due to respiratory viruses”.  Since 1992-2007 chief of the Institute of Pathology St. Petersburg Paediatric Medical Academy. Since 2017 V. Zinserling is organizing and providing the postgraduate medical training in pediatric pathology in Russia. He is also providing consultations in the city’s Consulting Centre for the Infectious Pathology and. Since 2017 professor of pathology at the V.A.  Almazov National Research Center. Author of more than 400 scientific publications devoted to different topics of infectious, perinatal and brain pathology, including manuals (in Russian) “Modern Infections” (2002), “Perinatal infections (2002)”, “Infections of the Nervous System” (2005). Author of two books “ Infectious Lesions of Respiratory tract (2021) and Infectious Lesions of the central Nervous System (2022), by Springer.  Participant of many international congresses, being invited lecturer at European Congresses of ESP (2010-2022).Prof. Alexey L. Poznyak works at the Department of Infectology of I.I. Mechnikov North-West Medical University (Saint-Petersburg, Russia). Author of 257 publications, including 3 monographs, chapters in 3 manuals, many of which were devoted to Chlamydiosis.Dr. Sergey N Sidorchuk is an Assistant Professor at the Department of Infectology since 2021. Author of 144 publications, including chapter “Chlamydiosis” in the manuals “Infectious diseases”, “Chlamydial infections”.Dr Katharina Wassilew graduated from the Charite'- Humboldt University in Berlin/Germany (MD).  She trained in histopathology at well-known University hospitals in Israel, Bulgaria and Switzerland and subspecialised initially in soft tissue and bone pathology and further in cardiothoracic pathology in subspecialised departments in Italy (Rizzoli Institute) and in the UK (Royal National Orthopedic Hospital, Royal Brompton Hospital). During her career, she led and developed subspecialised units and research groups in cardiovascular and heart/lung transplant pathology, as at the Deutsches Herzzentrum Berlin/Germany and was appointed as Associate Professor at Copenhagen University in Denmark, balancing responsibilities of combined diagnostic service / leadership positions and teaching.

• Introduction.- Chapter 1. Taxonomy of Chlamydia.- 1.1. Taxonomy of Chlamydiales.- 1.2. Brief characteristics of the Chlamydiaceae family.- Chapter 2. Pathogenesis of Chlamydiosis.- 2.1 Structural and functional characteristics, virulence factors of chlamydia spp.- 2.2. Interaction of chlamydia with host cells.- 2.3 Functional state of the immune system in patients with various forms of chronic urogenital chlamydial infection.- 2.4 Results of correlation analysis of immunological parameters in patients with localized and widespread forms of urogenital chlamydiosis.- Chapter 3. Epidemiology of chlamydial infections.- 3.1. Infections due to Chlamydia trachomatis.- 3.2. Infections caused by Chlamydia pneumonia.- 3.3  Infections by Chlamydia psittaci.- 3.4. Diseases caused by Chlamydia felis, Chlamydia abortus and Chlamydia caviae.- Chapter 4. Laboratory, instrumental and morphological diagnostics of Chlamydial infections.- 4.1 Modern aspects of diagnostics of diseases caused by C. trachomatis.- 4.2 Indications for testing for urogenital chlamydia.- 4.3 Methodological aspects of laboratory diagnostics of chlamydia.- 4.4 Diagnostic value of the results obtained by various methods of diagnosing chlamydial infection.- 4.5 Molecular ¬biological methods for diagnostics of C.trachomatis.- 4.6 Cultural method.- 4.7 Rapid tests in the diagnosis of sexually transmitted infections.- 4.8 Serological tests (enzyme-linked immunosorbent assay, indirect immunofluorescence).- 4.9 Determination of serotypes and molecular ¬biological characteristics of C. trachomatis.- 4.10 Diagnostics of urogenital chlamydia associated with trichomonas invasion.- 4.11 Diagnosis of widespread forms of chlamydial infection.- 4.12 Diagnosis of persistent forms of chlamydial infection.- 4.13. Laboratory and instrumental diagnostics of pneumochlamydiosis.- 4.14 Laboratory and instrumental diagnostics of ornithosis.- 4.15. Morphological methods for diagnosing chlamydiosis.- Chapter 5. Clinical and morphological characteristics of Chlamydial infections in humans.- 5.1. Urogenital chlamydiosis.- 5.2 Chlamydial lesions of the visual organ (Boyko E.V., Poznyak A.L., Suetov A.A.).- 5.3. Chlamydial lesions of the nervous system (with the participation of Vainshenker Yu.I., Mudritsky V.M.).- 5.4 PNEUMOCHLAMYDIOSIS.- 5.5 Arthropathy associated with chlamydial infection.- 5.6. Periodontitis (Together with A.F. Eliseeva).- 5.7 Other organ lesions.- Chapter 6. Perinatal chlamydiosis.- 6.1 Lessons of the afterbirth in chlamydiosis.- 6.2 Intrauterine chlamydiosis.- 6.3 Remote consequences of intrauterine chlamydiosis (in collaboration with YI Vainshenker).- Chapter 7. Problems of mixed chlamydial infections.- 7.1 Chlamydiosis and influenza.- 7.2 Chlamydiosis  and Covid.- 7.3 Combined brain lesions in severe non-infectious lesions (jointly with Yu.I. Vainshenker).- 7.4. Chlamydiosis and other urogenital infections.- Chapter 8. Chlamydia and non-infectious diseases.- 8.1 Chlamydia Pneumonia and atherosclerosis (jointly with Yu.I. Vainshenker).- 8.2 Role of Chlamydia pneumoniae in the pathogenesis of multiple sclerosis.- 8.3. Chlamydia and neurodegenerative diseases.- 8.4 Brain lesions in HIV infected patients associated with C. pneumoniae (in collaboration with Y.I. Vainshenker.- 8.5 Different neurological pathology associated with chlamydia (in collaboration with Y.I. Vainshenker).- 8.6 Other diseases probably associated with chlamydiosis.- Chapter 9. Chlamydiosis in animals.- 9.1. Chlamydiosis in cattle.- 9.2. Chlamydiosis in sheep.- 9.3. Chlamydiosis in pigs.- 9.4 Conclusion.- Chapter 10. Experimental chlamydiosis.- 10.1 Review of existing models of chlamydial infections.- 10.2 Review of existing experimental models of chlamydial infection of the nervous system.- 10.2 Ultrastructural changes in experimental chlamydial meningoencephalitis (L.S. Onischenko, partly in collaboration with M.M. Odinak, M.M. Mikhailenko, I.V. Nuralova).- Conclusion.

Prof. Vsevolod A. Zinserling (Tsinzerling) graduated from Leningrad Paediatric Medical Institute in 1977, worked as research scientist, practicing as pathologist in Leningrad Research Institute of Children’s Infections (1977-1988). In 1978-80 had postgraduate training at the chair of pathology (chief. Prof. O.K. Khmelnitsky) of Leningrad Institute for Postgraduate Medical Training. 1981 defended his cand. med. sc. (Dr. med.) thesis “Brain changes in mycoplasmosis”. In 1988-92 chief of the Central Research Laboratory of Leningrad Paediatric Medical Institute. In 1988 defended the doct. med. sci. thesis “Brain lesions due to respiratory viruses”.  Since 1992-2007 chief of the Institute of Pathology St. Petersburg Paediatric Medical Academy. Since 2017 V. Zinserling is organizing and providing the postgraduate medical training in pediatric pathology in Russia. He is also providing consultations in the city’s Consulting Centre for the Infectious Pathology and. Since 2017 professor of pathology at the V.A.  Almazov National Research Center. Author of more than 400 scientific publications devoted to different topics of infectious, perinatal and brain pathology, including manuals (in Russian) “Modern Infections” (2002), “Perinatal infections (2002)”, “Infections of the Nervous System” (2005). Author of two books “ Infectious Lesions of Respiratory tract (2021) and Infectious Lesions of the central Nervous System (2022), by Springer.  Participant of many international congresses, being invited lecturer at European Congresses of ESP (2010-2022).Prof. Alexey L. Poznyak works at the Department of Infectology of I.I. Mechnikov North-West Medical University (Saint-Petersburg, Russia). Author of 257 publications, including 3 monographs, chapters in 3 manuals, many of which were devoted to Chlamydiosis.Dr. Sergey N Sidorchuk is an Assistant Professor at the Department of Infectology since 2021. Author of 144 publications, including chapter “Chlamydiosis” in the manuals “Infectious diseases”, “Chlamydial infections”.Dr Katharina Wassilew graduated from the Charite'- Humboldt University in Berlin/Germany (MD).  She trained in histopathology at well-known University hospitals in Israel, Bulgaria and Switzerland and subspecialised initially in soft tissue and bone pathology and further in cardiothoracic pathology in subspecialised departments in Italy (Rizzoli Institute) and in the UK (Royal National Orthopedic Hospital, Royal Brompton Hospital). During her career, she led and developed subspecialised units and research groups in cardiovascular and heart/lung transplant pathology, as at the Deutsches Herzzentrum Berlin/Germany and was appointed as Associate Professor at Copenhagen University in Denmark, balancing responsibilities of combined diagnostic service / leadership positions and teaching.

• Introduction.- Chapter 1. Taxonomy of Chlamydia.- 1.1. Taxonomy of Chlamydiales.- 1.2. Brief characteristics of the Chlamydiaceae family.- Chapter 2. Pathogenesis of Chlamydiosis.- 2.1 Structural and functional characteristics, virulence factors of chlamydia spp.- 2.2. Interaction of chlamydia with host cells.- 2.3 Functional state of the immune system in patients with various forms of chronic urogenital chlamydial infection.- 2.4 Results of correlation analysis of immunological parameters in patients with localized and widespread forms of urogenital chlamydiosis.- Chapter 3. Epidemiology of chlamydial infections.- 3.1. Infections due to Chlamydia trachomatis.- 3.2. Infections caused by Chlamydia pneumonia.- 3.3  Infections by Chlamydia psittaci.- 3.4. Diseases caused by Chlamydia felis, Chlamydia abortus and Chlamydia caviae.- Chapter 4. Laboratory, instrumental and morphological diagnostics of Chlamydial infections.- 4.1 Modern aspects of diagnostics of diseases caused by C. trachomatis.- 4.2 Indications for testing for urogenital chlamydia.- 4.3 Methodological aspects of laboratory diagnostics of chlamydia.- 4.4 Diagnostic value of the results obtained by various methods of diagnosing chlamydial infection.- 4.5 Molecular ¬biological methods for diagnostics of C.trachomatis.- 4.6 Cultural method.- 4.7 Rapid tests in the diagnosis of sexually transmitted infections.- 4.8 Serological tests (enzyme-linked immunosorbent assay, indirect immunofluorescence).- 4.9 Determination of serotypes and molecular ¬biological characteristics of C. trachomatis.- 4.10 Diagnostics of urogenital chlamydia associated with trichomonas invasion.- 4.11 Diagnosis of widespread forms of chlamydial infection.- 4.12 Diagnosis of persistent forms of chlamydial infection.- 4.13. Laboratory and instrumental diagnostics of pneumochlamydiosis.- 4.14 Laboratory and instrumental diagnostics of ornithosis.- 4.15. Morphological methods for diagnosing chlamydiosis.- Chapter 5. Clinical and morphological characteristics of Chlamydial infections in humans.- 5.1. Urogenital chlamydiosis.- 5.2 Chlamydial lesions of the visual organ (Boyko E.V., Poznyak A.L., Suetov A.A.).- 5.3. Chlamydial lesions of the nervous system (with the participation of Vainshenker Yu.I., Mudritsky V.M.).- 5.4 PNEUMOCHLAMYDIOSIS.- 5.5 Arthropathy associated with chlamydial infection.- 5.6. Periodontitis (Together with A.F. Eliseeva).- 5.7 Other organ lesions.- Chapter 6. Perinatal chlamydiosis.- 6.1 Lessons of the afterbirth in chlamydiosis.- 6.2 Intrauterine chlamydiosis.- 6.3 Remote consequences of intrauterine chlamydiosis (in collaboration with YI Vainshenker).- Chapter 7. Problems of mixed chlamydial infections.- 7.1 Chlamydiosis and influenza.- 7.2 Chlamydiosis  and Covid.- 7.3 Combined brain lesions in severe non-infectious lesions (jointly with Yu.I. Vainshenker).- 7.4. Chlamydiosis and other urogenital infections.- Chapter 8. Chlamydia and non-infectious diseases.- 8.1 Chlamydia Pneumonia and atherosclerosis (jointly with Yu.I. Vainshenker).- 8.2 Role of Chlamydia pneumoniae in the pathogenesis of multiple sclerosis.- 8.3. Chlamydia and neurodegenerative diseases.- 8.4 Brain lesions in HIV infected patients associated with C. pneumoniae (in collaboration with Y.I. Vainshenker.- 8.5 Different neurological pathology associated with chlamydia (in collaboration with Y.I. Vainshenker).- 8.6 Other diseases probably associated with chlamydiosis.- Chapter 9. Chlamydiosis in animals.- 9.1. Chlamydiosis in cattle.- 9.2. Chlamydiosis in sheep.- 9.3. Chlamydiosis in pigs.- 9.4 Conclusion.- Chapter 10. Experimental chlamydiosis.- 10.1 Review of existing models of chlamydial infections.- 10.2 Review of existing experimental models of chlamydial infection of the nervous system.- 10.2 Ultrastructural changes in experimental chlamydial meningoencephalitis (L.S. Onischenko, partly in collaboration with M.M. Odinak, M.M. Mikhailenko, I.V. Nuralova).- Conclusion.

Prof. Vsevolod A. Zinserling (Tsinzerling) graduated from Leningrad Paediatric Medical Institute in 1977, worked as research scientist, practicing as pathologist in Leningrad Research Institute of Children’s Infections (1977-1988). In 1978-80 had postgraduate training at the chair of pathology (chief. Prof. O.K. Khmelnitsky) of Leningrad Institute for Postgraduate Medical Training. 1981 defended his cand. med. sc. (Dr. med.) thesis “Brain changes in mycoplasmosis”. In 1988-92 chief of the Central Research Laboratory of Leningrad Paediatric Medical Institute. In 1988 defended the doct. med. sci. thesis “Brain lesions due to respiratory viruses”.  Since 1992-2007 chief of the Institute of Pathology St. Petersburg Paediatric Medical Academy. Since 2017 V. Zinserling is organizing and providing the postgraduate medical training in pediatric pathology in Russia. He is also providing consultations in the city’s Consulting Centre for the Infectious Pathology and. Since 2017 professor of pathology at the V.A.  Almazov National Research Center. Author of more than 400 scientific publications devoted to different topics of infectious, perinatal and brain pathology, including manuals (in Russian) “Modern Infections” (2002), “Perinatal infections (2002)”, “Infections of the Nervous System” (2005). Author of two books “ Infectious Lesions of Respiratory tract (2021) and Infectious Lesions of the central Nervous System (2022), by Springer.  Participant of many international congresses, being invited lecturer at European Congresses of ESP (2010-2022).Prof. Alexey L. Poznyak works at the Department of Infectology of I.I. Mechnikov North-West Medical University (Saint-Petersburg, Russia). Author of 257 publications, including 3 monographs, chapters in 3 manuals, many of which were devoted to Chlamydiosis.Dr. Sergey N Sidorchuk is an Assistant Professor at the Department of Infectology since 2021. Author of 144 publications, including chapter “Chlamydiosis” in the manuals “Infectious diseases”, “Chlamydial infections”.Dr Katharina Wassilew graduated from the Charite'- Humboldt University in Berlin/Germany (MD).  She trained in histopathology at well-known University hospitals in Israel, Bulgaria and Switzerland and subspecialised initially in soft tissue and bone pathology and further in cardiothoracic pathology in subspecialised departments in Italy (Rizzoli Institute) and in the UK (Royal National Orthopedic Hospital, Royal Brompton Hospital). During her career, she led and developed subspecialised units and research groups in cardiovascular and heart/lung transplant pathology, as at the Deutsches Herzzentrum Berlin/Germany and was appointed as Associate Professor at Copenhagen University in Denmark, balancing responsibilities of combined diagnostic service / leadership positions and teaching.

• Introduction.- Chapter 1. Taxonomy of Chlamydia.- 1.1. Taxonomy of Chlamydiales.- 1.2. Brief characteristics of the Chlamydiaceae family.- Chapter 2. Pathogenesis of Chlamydiosis.- 2.1 Structural and functional characteristics, virulence factors of chlamydia spp.- 2.2. Interaction of chlamydia with host cells.- 2.3 Functional state of the immune system in patients with various forms of chronic urogenital chlamydial infection.- 2.4 Results of correlation analysis of immunological parameters in patients with localized and widespread forms of urogenital chlamydiosis.- Chapter 3. Epidemiology of chlamydial infections.- 3.1. Infections due to Chlamydia trachomatis.- 3.2. Infections caused by Chlamydia pneumonia.- 3.3  Infections by Chlamydia psittaci.- 3.4. Diseases caused by Chlamydia felis, Chlamydia abortus and Chlamydia caviae.- Chapter 4. Laboratory, instrumental and morphological diagnostics of Chlamydial infections.- 4.1 Modern aspects of diagnostics of diseases caused by C. trachomatis.- 4.2 Indications for testing for urogenital chlamydia.- 4.3 Methodological aspects of laboratory diagnostics of chlamydia.- 4.4 Diagnostic value of the results obtained by various methods of diagnosing chlamydial infection.- 4.5 Molecular ¬biological methods for diagnostics of C.trachomatis.- 4.6 Cultural method.- 4.7 Rapid tests in the diagnosis of sexually transmitted infections.- 4.8 Serological tests (enzyme-linked immunosorbent assay, indirect immunofluorescence).- 4.9 Determination of serotypes and molecular ¬biological characteristics of C. trachomatis.- 4.10 Diagnostics of urogenital chlamydia associated with trichomonas invasion.- 4.11 Diagnosis of widespread forms of chlamydial infection.- 4.12 Diagnosis of persistent forms of chlamydial infection.- 4.13. Laboratory and instrumental diagnostics of pneumochlamydiosis.- 4.14 Laboratory and instrumental diagnostics of ornithosis.- 4.15. Morphological methods for diagnosing chlamydiosis.- Chapter 5. Clinical and morphological characteristics of Chlamydial infections in humans.- 5.1. Urogenital chlamydiosis.- 5.2 Chlamydial lesions of the visual organ (Boyko E.V., Poznyak A.L., Suetov A.A.).- 5.3. Chlamydial lesions of the nervous system (with the participation of Vainshenker Yu.I., Mudritsky V.M.).- 5.4 PNEUMOCHLAMYDIOSIS.- 5.5 Arthropathy associated with chlamydial infection.- 5.6. Periodontitis (Together with A.F. Eliseeva).- 5.7 Other organ lesions.- Chapter 6. Perinatal chlamydiosis.- 6.1 Lessons of the afterbirth in chlamydiosis.- 6.2 Intrauterine chlamydiosis.- 6.3 Remote consequences of intrauterine chlamydiosis (in collaboration with YI Vainshenker).- Chapter 7. Problems of mixed chlamydial infections.- 7.1 Chlamydiosis and influenza.- 7.2 Chlamydiosis  and Covid.- 7.3 Combined brain lesions in severe non-infectious lesions (jointly with Yu.I. Vainshenker).- 7.4. Chlamydiosis and other urogenital infections.- Chapter 8. Chlamydia and non-infectious diseases.- 8.1 Chlamydia Pneumonia and atherosclerosis (jointly with Yu.I. Vainshenker).- 8.2 Role of Chlamydia pneumoniae in the pathogenesis of multiple sclerosis.- 8.3. Chlamydia and neurodegenerative diseases.- 8.4 Brain lesions in HIV infected patients associated with C. pneumoniae (in collaboration with Y.I. Vainshenker.- 8.5 Different neurological pathology associated with chlamydia (in collaboration with Y.I. Vainshenker).- 8.6 Other diseases probably associated with chlamydiosis.- Chapter 9. Chlamydiosis in animals.- 9.1. Chlamydiosis in cattle.- 9.2. Chlamydiosis in sheep.- 9.3. Chlamydiosis in pigs.- 9.4 Conclusion.- Chapter 10. Experimental chlamydiosis.- 10.1 Review of existing models of chlamydial infections.- 10.2 Review of existing experimental models of chlamydial infection of the nervous system.- 10.2 Ultrastructural changes in experimental chlamydial meningoencephalitis (L.S. Onischenko, partly in collaboration with M.M. Odinak, M.M. Mikhailenko, I.V. Nuralova).- Conclusion.