Dr. Kersák János 1943-ban született Tamásiban, pedagógus szülők gyermekeként. Általános és középiskolai tanulmányait is szülővárosában végezte. 1962 és 1968 között a Pécsi Orvostudományi Egyetem Általános Orvosi Karán tanult, ahol már hallgatóként bekapcsolódott a tudományos munkába: 1964-től az Élettani Intézetben, majd 1966-tól az I. számú Belgyógyászati Klinika Tudományos Diákkörében tevékenykedett.
Diplomáját 1968-ban szerezte meg, ezt követően pedig a Siófoki Városi Kórház I. számú Belgyógyászati Osztályán kezdte meg orvosi pályafutását, ahol a kórház megnyitásától dolgozott. 1973-ban belgyógyászatból szakvizsgázott, majd megszervezte a kórház addig még nem működő gasztroenterológiai részlegét. Vezetésével diagnosztikus hasi laparoszkópiákat, tűbiopsziákat, majd 1974-től gasztroenterológiai endoszkópos vizsgálatokat végeztek. 1980-tól adjunktusként, 1990-től részlegvezető főorvosként irányította a belgyógyászati és gasztroenterológiai ellátást. 1994-ben gasztroenterológiából is szakvizsgát tett.
A gasztroenterológia területén kiemelkedő eredményeket értek el a masszív fekélyvérzések endoszkópos csillapításában. Az általa kidolgozott endoszkópos injekciós vérzéscsillapítás módszerét 1997-ben az Orvosi Hetilap Klinikai Tanulmányok rovatában publikálták, és eredményeiket számos országos szakmai fórumon ismertették. Munkájukkal jelentősen javították a korábban magas halálozási aránnyal járó fekélyvérzések prognózisát, ezzel számos beteg életét mentették meg.
Pályafutása során részt vett a középkáderek szakmai oktatásában is, valamint aktív szerepet vállalt a szakmai közéletben: évekig a Magyar Orvosi Kamara országos küldöttjeként, valamint az EDDSZ-ben a Siófoki Kórház Diplomás Alapszervezetének titkáraként tevékenykedett.
Munkásságát több elismeréssel is jutalmazták: 1998-ban Semmelweis Emlékéremmel tüntették ki, 2001-ben pedig a „Siófokért” emlékplakettet kapta a városért végzett munkájáért. Több mint négy évtizedes kórházi szolgálat után, 67 éves korában fejezte be kórházi pályafutását, de orvosi tevékenységét tovább folytatta.
2010 és 2025 októbere között az Endomedix Kft. siófoki részlegének orvos-igazgatójaként dolgozott, majd 2025 novemberétől a Calendula Bt. keretein belül folytatja belgyógyászati és gasztroenterológiai munkáját. 2018-ban, 50 éves orvosi pályafutása alkalmából – Siófok város 50. születésnapján – Siófok Város Díszpolgára kitüntetésben részesült.
What a 3 weeks it has been! The clinic is beautiful, the nurses and the therapists are very kind and really professional. The professionalism and humanity of the doctors helped me a lot to start on the road to recovery! They probably saved my life too, I am thankful to fate that I found you!
We are very satisfied every time! Thanks for all the kindness and help! We will be back!
I think of you all with eternal gratitude! Thank you so much for what you have done for me!
With a grateful heart I thank you for the past three weeks! Thank you for your professionalism, humanity, help and empathy. Thank you for all the smiles and encouragement, which have contributed greatly to my recovery.
Thank you for everything Calendula! We are patients of Doctor Dimitrij. I was admitted because my ears kept plugging up, Mum was admitted because she had a backache. I've been to almost all the ear, nose and throat specialists in Budapest, but unfortunately they couldn't help me. Mum and I came here to Calendula and they finally cured me. Dmitry Skopincev is a GREAT man!
See the miracle! Yes, a miracle at the Calendula Clinic, a miracle for the medical team, the nurses, the masseurs, the staff. So much love, care, helpfulness, kindness, caring, selflessness, positive attitude and last but not least the KNOWLEDGE that I have experienced here has helped me to heal. It is with love and deep humility that I think of all the people who have helped me to get on the road to recovery. ...Thank you so much for what you have done for me. I will never forget this clinic! I live again!!!! See you soon!
I leave your healing institution feeling good and rested. Congratulations to the Chief Medical Officer and his staff for gathering so many kind, helpful people around you to help people who need help. I wish God's blessings on the lives and work of all of you.
Let me thank you for the professionalism, kindness and maximum supportive environment I have received here! I have never experienced such kindness and helpfulness during my stay here! I was amazed at the system of a million different treatment methods, one on top of the other, to lure toxins out of the body under absolutely personalized medical supervision. Furthermore, the fact cannot be ignored how much visible weight loss has been achieved in such a short time! I am very grateful for the dedicated work of the doctors!
Congratulations! Fantastic team! Everyone was superb at the Calendula!
Thank you for creating this beautiful and life-giving institution! We wish you all many happy guests and joy in them!
I haven't had so much fun in a long time! Thanks to Calendula for the opportunity, organization, great food! ...It's amazing the energy that was released in me. We were always surrounded by a positive atmosphere and energy. ... Thank you, thank you, thank you!
Dear Chief Medical Officer! Thank you very much for what you did for me. I feel cured and I have you and your kind staff to thank for that! I always think of you with gratitude and love!
Thank you so much for your dedicated care, endless patience and attention to our recovery. We very much appreciate your many smiles and kindnesses, your high level of organisation and expertise, and your inexhaustible sense of humour.
Thank you so much for your dedicated care, endless patience and attention to our recovery. We very much appreciate your many smiles and kindnesses, your high level of organisation and expertise, and your inexhaustible sense of humour.
I want to thank everyone for everything you have done for me here. I spent 3 weeks here and I went home with a big smile on my face, because not only did my health improve a lot, but I felt like family here. Everyone who works here is very kind and professional. I could list everyone by name because I had a very positive experience with everyone. The list would be very long, so I would like to list just a few... The physiotherapy with Sari was very good. Thank you also to the nurses for the always warm welcome and the smiles every day. To the doctors, thank you very much for helping me and putting me on the right track as far as my health is concerned. Thank you so much for the super massages. The food was delicious.
What a three weeks it has been! Your clinic is beautiful, the nurses and the therapists are very professional. The professionalism and humanity of your doctors helped me a lot to start my healing journey. At the end of my stay, I often think that they probably saved my life. I am grateful to fate that I found you.
Thank you very much for everything. We had a great time! We wish you all good health and good luck for the future. Eternal gratitude!
Dear Calendula Clinic! With a grateful heart I thank you for the past three weeks. Thank you for your professionalism, your humanity, your help and your empathy. Thank you for all the smiles and encouragement which have contributed greatly to my recovery.
I leave your healing institution feeling good and rested. Congratulations to the Chief Medical Officer and his staff for gathering so many helpful and kind people around you to help people who need help. I wish God's blessings on the lives and work of all of you.
Dear Calendula Management! Let me thank you for the professionalism, kindness and maximum supportive environment I have received here. I have never experienced such kindness and helpfulness during my entire stay. I was amazed at the system of a million different treatment methods in succession to lure toxins out of the body in an absolutely personalized way, under constant medical supervision. Nor can we neglect the fact how much visible weight loss has been achieved in a short time! I am very grateful for the dedicated work of the doctors!
Dear Calendula Management! Let me thank you for the professionalism, kindness and maximum supportive environment I have received here. I have never experienced such kindness and helpfulness during my entire stay. I was amazed at the system of a million different treatment methods in succession to lure toxins out of the body in an absolutely personalized way, under constant medical supervision. Nor can we neglect the fact how much visible weight loss has been achieved in a short time! I am very grateful for the dedicated work of the doctors!
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