Japonya) Kongresinde poster olarak sunulmuştur. ÖZEscherichia coli'nin bazı serogrup ve serotiplerinin gastroenterit etiyolojisindeki rolü her geçen gün daha iyi anlaşılmaktadır. Patojen E.coli kökenlerini normal bağırsak flora elemanlarından ayıran virülans faktörlerinin tespiti, hastalığın tanı ve tedavisi açısından önem taşımaktadır. Bu çalışmada, gastroenterite yol açan E.coli kökenlerinin serotiplendirilmesi ve virülans genlerinin polimeraz zincir reaksiyonu (PCR) ile araştırılması amaçlanmıştır. Çalışmaya, Şubat-Ekim 2009 tarihleri arasında Trakya Üniversitesi Tıp Fakültesi, Sağlık Araştırma ve Uygulama Hastanesi kliniklerine ishal şikayeti ile başvuran hastalardan alınarak Mikrobiyoloji Laboratuvarına gönderilen sulu, kanlı veya mukuslu 202 dışkı örneği dahil edilmiştir. Örneklerde baskın olarak üreyen ve konvansiyonel yöntemlerle tanımlanan toplam 254 E.coli kökeni, enteropatojenik E.coli (EPEC), enterotoksijenik E.coli (ETEC) ve enteroinvazif E.coli (EIEC)'ye ait O serogruplarını içeren 6 adet polivalan antiserum kullanılarak lam aglütinasyonu (LA) ile taranmıştır. Serolojik yöntemle pozitif sonuç veren örnekler ile kontrol olarak negatifler arasından haritalama metodu ile seçilen aynı sayıda dışkı örneği, EPEC, ETEC ve EİEC'ye ait virülans genlerinin varlığı açısından konvansiyonel PCR yöntemi ile araştırılmıştır. Çalışmamızda, örneklerin %14.3'ü (29/202) LA ile serogruplandırılmış; bunların 13 (%6.4)'ü EPEC, 11 (%5.4)'i EIEC ve 5 (%2.4)'i ETEC olarak tanımlanmıştır. Monovalan antiserumlar ile EPEC serogrubundaki beş bakterinin tiplendirilmesi yapılabilmiş ve bu kökenlerin O1 serogrubunda olduğu tespit edilmiştir. Serogruplandırılan 29 patojen E.coli'den 3 (%10.3)'ünde diyarejenik suşlara ait virülans genleri saptanmıştır. Bir izolat EPEC'e ait eaeA geni pozitif bulunmasına rağmen, bfpA ve stx geni içermediğinden atipik EPEC olarak tanımlanmıştır.
Neisseria meningitidis is an unusual pathogen among the causes of acute bacterial conjunctivitis. Meningococcal conjunctivitis may present as primary or secondary infection, while primary meningococcal conjunctivitis may emerge as invasive or non-invasive forms. N.meningitidis W135 strain is not common in Turkey, and is rarely reported as the cause of meningitis. Moreover, no cases of conjunctivitis due to N.meningitidis W135 were reported from Turkey. In this report a case of N.meningitidis W135 conjunctivitis has been presented who acquired the infection from another patient with meningococcal meningitis by close contact in the hospital environment. A 2-month-old male infant was admitted to our hospital with poor health condition, feeding difficulty and weight loss. He was hospitalized in intensive care unit and fluid replacement started due to severe dehydration. The infant had stigmata of Down's Syndrome, and since conjunctivitis were detected on physical examination, swab samples were obtained from both eyes for direct microscopic examination and cultivation. Abundant lekocytes and gram-negative diplococci were observed in Gram-stained smears, and bacterial growth were detected in the culture from left eye samples. The isolate have been identified as N.meningitidis by conventional microbiological methods, and serotyping of the isolate yielded W135 strain. The infant was treated with systemic cefotaxime and ampicillin-sulbactam, together with topical tobramycin and gentamycin. Since no symptoms of meningitis appeared during the follow-ups, the case was diagnosed as non-invasive primary meningococcal conjunctivitis. Investigation for a probable source revealed that the infant had close contact with a six-year-old boy with high fever, unconsciousness and vomiting a week ago in the outpatient clinic of Tekirdag State Hospital. N.meningitidis was also isolated from the cerebrospinal fluid culture of probable index case with meningitis and identified as W135 strain by serotyping. Both strains isolated from these cases were found similar according to their phenotypical characteristics, however genotyping could not be performed. Since no other sources of exposure could be found, it was concluded that the infant with conjunctivitis acquired the bacteria from the other patient during their shared hospital visit. This patient is the first N.meningitidis W135 conjunctivitis case reported from Turkey.
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