Christos Kittas

Dr. Christos Kittas

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Research Focus & Metrics

Academic Career Length

4Years (2023-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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18 June 2023 in Journal of Fungi
Verified
Journal Article
Open access
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APAntigone Pieta
Antigone Pieta
AVAliki I. Venetsanopoulou
Aliki I. Venetsanopoulou
CKChristos Kittas
Christos Kittas
ECEirini Christaki
Eirini Christaki
PVParaskevi V. Voulgari
Paraskevi V. Voulgari
Rheumatoid arthritis (RA) patients deal with a higher risk of bacterial and fungal infections compared to the general population because of their dysregulated immune system as well as the immunosuppressive therapy they usually receive. Scedosporium spp. is a fungal pathogen responsible for cutaneous, lung, central nervous system, and eye infections, mostly in immunocompromised patients, leading to death in disseminated cases. We report the case of an 81-year-old woman with rheumatoid arthritis treated with steroids and an IL-6 inhibitor who was diagnosed with scedosporiosis of the upper limb. She was treated with voriconazole for one month, which was discontinued due to adverse events, and when scedosporiosis relapsed, she switched to itraconazole. We also reviewed the current literature on RA patients presenting with Scedosporium infections. Early and accurate diagnosis of scedosporiosis has therapeutic and prognostic implications, as traditionally this fungus is resistant to commonly used antifungals. Clinical alertness regarding uncommon infections, including fungal, in patients with autoimmune diseases on immunomodulatory agents is essential for effective treatment.

18 October 2023 in Antibiotics
Verified
Journal Article
Open access
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AMAngeliki Mavroidi
Angeliki Mavroidi
KGKonstantina Gartzonika
Konstantina Gartzonika
NSNikolaos Spanakis
Nikolaos Spanakis
EFElisavet Froukala
Elisavet Froukala
CKChristos Kittas
Christos Kittas
Athanasios TsakrisAthanasios Tsakris
Athanasios Tsakris
Nosocomial outbreaks of multidrug-resistant (MDR) Enterobacter cloacae complex (ECC) are often reported worldwide, mostly associated with a small number of multilocus-sequence types of E. hormaechei and E. cloacae strains. In Europe, the largest clonal outbreak of blaNDM-1-producing ECC has been recently reported, involving an ST182 E. hormaechei strain in a Greek teaching hospital. In the current study, we aimed to further investigate the genetic make-up of two representative outbreak isolates. Comparative genomics of whole genome sequences (WGS) was performed, including whole genome-based taxonomic analysis and in silico prediction of virulence determinants of the bacterial cell surface, plasmids, antibiotic resistance genes and virulence factors present on genomic islands. The enterobacterial common antigen and the colanic antigen of the cell surface were identified in both isolates, being similar to the gene clusters of the E. hormaechei ATCC 49162 and E. cloacae ATCC 13047 type strains, whereas the two strains possessed different gene clusters encoding lipopolysaccharide O-antigens. Other virulence factors of the bacterial cell surface, such as flagella, fimbriae and pili, were also predicted to be encoded by gene clusters similar to those found in Enterobacter spp. and other Enterobacterales. Secretion systems and toxin–antitoxin systems, which also contribute to pathogenicity, were identified. Both isolates harboured resistance genes to multiple antimicrobial classes, including β-lactams, aminoglycosides, quinolones, chloramphenicol, trimethoprim, sulfonamides and fosfomycin; they carried blaTEM-1, blaOXA-1, blaNDM-1, and one of them also carried blaCTXM-14, blaCTXM-15 and blaLAP-2 plasmidic alleles. Our comprehensive analysis of the WGS assemblies revealed that blaNDM-1-producing outbreak isolates possess components of the bacterial cell surface as well as genomic islands, harbouring resistance genes to several antimicrobial classes and various virulence factors. Differences in the plasmids carrying β-lactamase genes between the two strains have also shown diverse modes of acquisition and an ongoing evolution of these mobile elements.

14 July 2023 in Microorganisms
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Journal Article
Open access
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IAIoannis Andrianopoulos
Ioannis Andrianopoulos
TMTheodora Maniatopoulou
Theodora Maniatopoulou
NLNikolaos Lagos
Nikolaos Lagos
NKNikolaos Kazakos
Nikolaos Kazakos
APAthanasios Papathanasiou
Athanasios Papathanasiou
VKVasilios Koulouras
Vasilios Koulouras
The coronavirus disease (COVID-19) pandemic increased the incidence of severe infections caused by multidrug-resistant (MDR) pathogens among critically ill patients, such as Acinetobacter baumannii (AB), whose bloodstream infections (BSIs) have been associated with significant mortality. Whether there is any difference in outcome between COVID-19 and non-COVID-19 patients with AB BSI still remains unknown. We conducted a retrospective study comparing clinical characteristics and outcomes of COVID-19 versus non-COVID-19 critically ill patients with AB BSI. Overall, 133 patients with AB BSI (102 COVID-19, 31 non-COVID-19) were studied. The 28-day mortality rate was high and did not differ significantly (69.6% COVID-19 vs. 61.3% non-COVID-19, p = 0.275). Patients with septic shock had a higher mortality rate irrespective of their status with the majority of deaths occurring during the first 7 days. COVID-19 patients were more likely to have ventilator-associated pneumonia (VAP) as the source of BSI (55.8% vs. 22.3%, respectively, p = 0.0001) and were more likely to develop acute respiratory distress syndrome (ARDS) (78.4% vs. 48.4%, respectively, p = 0.001), sepsis (86.3% vs. 67.7%, respectively, p = 0.03), and septic shock (88.3% vs. 58.1%, respectively, p = 0.007) compared to the non-COVID-19 patient group. In conclusion, COVID-19 patients with A. baumannii BSI have a high rate of mortality and more often develop septic shock, while VAP is the main origin of their BSI.

1 April 2026 in Diseases
Verified
Journal Article
Open access
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PBPETROS BOZIDIS
PETROS BOZIDIS
CKChristos Kittas
Christos Kittas
AMAlexandra Myari
Alexandra Myari
KPKonstantinos Patras
Konstantinos Patras
KGKonstantina Gartzonika
Konstantina Gartzonika
Background/Objectives: This retrospective study investigates the prevalence and distribution of HCV genotypes among 233 genotyped patients from the Epirus region of Northwestern Greece from 2014 to 2024. Methods: Genotypes were detected by molecular diagnostic assays, and their association with demographic parameters and viral load was analyzed. Results: The most prevalent subtype was 3a (50.2%), especially among younger and male patients, followed by subtypes 1b and 1a. A statistically significant association was found between genotype and both age and sex, while genotype distribution did not significantly differ by national origin. Furthermore, subtype 6c-I was found only in a non-native case, suggesting a possible introduction of this rare strain. Viral load showed no significant difference by sex, genotype, or age group. A notable decline in HCV cases was documented during the COVID-19 pandemic, underscoring the impact of the public health crisis on HCV diagnosis. Despite the decreasing need for genotyping in the direct-acting antiviral (DAA) era, our findings support the continued molecular surveillance of circulating HCV strains. Conclusions: This is the first study to longitudinally assess HCV genotype dynamics over a full decade (2014–2024) in the Epirus region of Northwestern Greece, capturing trends during the COVID-19 era and documenting the emergence of rare genotypes. It contributes to the evolving knowledge of HCV epidemiology in Southeastern Europe.