Antibody Response to COVID-19 Vaccines in Healthcare Workers: Which One is More Successful? Homologous or Heterologous?

Objectives: We aimed to determine the antibody levels created by COVID-19 vaccination in healthcare workers and the factors affecting the antibody response. Methods: Our research is a single-center, observational study that was prospectively designed and retrospectively analyzed at the beginning of the COVID-19 pandemic, and included 103 healthcare workers who received the three-dose regimen of COVID-19 vaccine. In accordance with the recommendations of the Ministry of Health of Turkey, the first two doses of CoronaVac vaccine were administered routinely, while the booster dose was given as BioNTech or CoronaVac (heterologous or homologous vaccination) depending on the preference of the volunteers. Antibody titers against the SARS-CoV-2 were measured in all individuals at different time points (1 month after the second dose of CoronaVac, before the booster dose [BioNTech or CoronaVac] at the fifth month and one month after the booster dose) with AESKULISA® SARS-CoV-2 S1 IgG (AESKU DIAGNOSTICS, Wendelsheim, Germany). Results: The mean age was 39.98±11.31 years, 62.1% of whom were women and 54.4% of them were accompanied by comorbid disease. After two doses of CoronaVac, the antibody titer averaged 49.50±33.15 U/mL in the 1st month (antibody seropositivity 86%) and the antibody titer decreased 24.01±33.48 U/mL (antibody seropositivity 49.5%) at 5th month. The mean antibody titer was found 59.73±60.20 U/ml in those who received the booster dose of homologous and 185.07±46.28 U/mL in those who were heterologous (p<0.001). Antibody levels were detected significantly lower after the booster dose of vaccination in patients with comorbidities (p<0.05). Conclusion: Our study, which reflects the data within the scope of the Turkey Ministry of Health's COVID-19 vaccination program determined that the antibody response after heterologous vaccination is better than in homologous vaccination. Antibody titer level in the 5th month was 50% waned after two doses of inactivated vaccination. It was also shown that factors such as gender, age, body mass index, and smoking did not create a statistically significant difference in homologous and heterologous vaccination, but after the booster dose antibody levels decreased significantly in those with comorbidity.

Comparison of serum cystatin C and creatinine levels in determining glomerular filtration rate in children with stage I to III chronic renal disease.

BACKGROUND: Pediatric studies are relatively scarce on the superiority of cystatin C over creatinine in estimation of glomerular filtration rate (GFR). This study measured cystatin C and serum creatinine levels, and compared GFR estimated from these two parameters in patients with chronic renal disease. METHODS: This prospective, observational, controlled study included 166 patients aged 1-18 years diagnosed with stage I to III chronic renal disease, and 29 age- and sex-matched control subjects. In all patients, GFR was estimated via creatinine clearance, Schwartz formula, Zappitelli 1 and Zappitelli 2 formula and the results were compared using Bland-Altman analysis. RESULTS: Patients and controls did not differ with regard to height, body weight, BMI, serum creatinine and serum cystatin levels, and Schwartz formula-based GFR (p > 0.05). There was a significant relationship between creatinine and cystatin C levels. However, although creatinine levels showed a significant association with age, height, and BMI, cystatin C levels showed no such association. ROC analysis showed that cystatin C performed better than creatinine in detecting low GFR. CONCLUSION: Cystatin C is a more sensitive and feasible indicator than creatinine for the diagnosis of stage I to III chronic renal disease.

A comparative study of dermatophyte infections in Bursa, Turkey.

A total of 555 specimens from 372 patients with symptoms compatible with superficial mycosis were included in this study. Those from patients clinically diagnosed as having dermatomycosis were thoroughly investigated by mycological examinations in the laboratory, including microscopic studies of KOH mounts and cultivation of the samples in culture. The results of this study and a previous study in our hospital conducted in 1980 were compared with respect to clinical presentation and etiological agents. Onychomycosis was the most common clinical form of dermatomycoses, and Trichophyton rubrum was the most common pathogen in this study.

The effect of age and gender on the electrocardiogram in children.

Our aim was to determine, using a computer program for measurement and analysis, the effects, if any, of age and gender on the electrocardiographic measurements in a large cohort of Turkish children. We analyzed standard simultaneous 12-lead electrocardiograms from 2241 healthy Turkish children, aged from 1 day to 16 years, to calculate limits of normality of a variety of electrocardiographic measurements for 12 age groups. Clinically significant differences were shown to exist, and the results compared with previously established normal limits. Differences were demonstrated for gender in measurements of both amplitude and duration, particularly in the adolescent period. We have provided tables and figures showing age and gender-dependent means and upper limits of normal electrocardiographic parameters for the important leads.

Targeted surveillance to assess the presence of BSE in the age risk population of cattle slaughtered in Bursa, Turkey: preliminary results of an immunohistochemical detection study for the 2004-2005 period.

Bovine spongiform encephalopathy (BSE), a member of the transmissible spongiform encepahlopathies, has been a notifiable disease in Turkey since 1997. In 2002, the BSE status of Turkey was assessed by the EU Scientific Steering Committee as "it is likely but not confirmed". This study presents the results of a targeted surveillance study to assess the presence of BSE in the age risk population of Bursa, Turkey. In the assessment procedure, the immunohistochemical detection of protease-resistant prion protein (PrP-Sc) was aimed at and applied to 420 brain tissues of cattle slaughtered in Bursa at an age of 30-months and older. None of the samples were positive for BSE.

Relationship between the arterial calcification detected in mammography and coronary artery disease.

OBJECTIVE: Arterial calcification is frequently encountered in mammography. The frequency of breast arterial calcification (BAC) increases with increasing age. Studies have shown that BAC is seen more frequently among the people who are under the risk of coronary artery diseases (CAD) such as diabetes and hypertension. The objective of this study is to investigate the relationship between the arterial calcification detected in mammography and the CAD. MATERIAL AND METHODS: Screening mammography was performed in 123 women above the age of 40 years who had been examined with coronary angiography for the evaluation of CAD. The presence of BAC, number of affected vessels, and the distribution of calcification in the vessel wall were evaluated in the mammography. Subjects were questioned in terms of the cardiovasculary risk factors. The severity of CAD was evaluated according to the Gensini scoring. In addition, the number of blood vessels with stenosis of more than 50% was used as the vascular score. The correlation between Gensini and the vascular scores, and BAC was statistically evaluated using Mann-Whitney U and Kruskal-Wallis tests. RESULTS: Eighty (65%) of 123 patients had CAD. BAC was detected in the mammography of 49 (39.8%) subjects. The ages and duration of menopause of the cases with BAC were significantly higher than those without BAC (p<0.001). There was an almost significant correlation between the BAC and Gensini scores (p=0.059). There was a significant increase in the frequency of BAC among subjects with more than two vessels with stenosis (p=0.033). CONCLUSION: Frequency of BAC increases with increasing age. BAC is also frequently seen in subjects having severe coronary artery disease. Although increasing age may be a factor increasing the frequency of BAC, BAC may also be an indicator of CAD. Therefore, the mentioning of arterial calcification in mammography reports may be important in warning the clinician in terms of CAD.

Catheter-related complications in children on chronic peritoneal dialysis.

Catheter-related complications--including infection, dialysate leak, subcutaneous leak, outflowfailure, and malfunction--are the principal causes of peritoneal dialysis (PD) failure. In the present retrospective study, we evaluated the catheter-related complications that occurred in children at our facility who were started on chronic PD during the period from July 1997 to August 2004. During the study period, 72 catheters were placed in 53 patients (28 girls, 25 boys). The average follow-up period was 29.4 + 19.3 months. Catheter-related complications developed in 41 patients. The risk for subcutaneous dialysate leak was no more significant when PD catheters were used early (< or = 7 days post placement) than when use was delayed (>7 days). Similarly, no significant difference was observed in the infection rate between the early- and delayed-use groups. During the study, 87 episodes of peritonitis occurred in 39 patients (1 episode / 18 patient-months). The infection rate was significantly different (p < 0.05) in patients with a low serum albumin level. No significant difference was seen between the early--and delayed--use groups in dialysis duration or number of catheter changes. However, we did observe a significant difference (p < 0.05) in subcutaneous leaks with longer dialysis duration. No correlation was observed between early or delayed catheter use and infection, dialysate leak, hernia, or subcutaneous leak. In conclusion, we observed no significant differences in catheter-related complications between early- and delayed-use catheter groups. A low serum albumin level appears to be a risk factor for infection after PD catheter placement.

Prognostic value of nm23 in gastrointestinal stromal tumors.

AIM/BACKGROUND: nm23 is suggested to represent a new class of metastasis suppressor genes. An inverse correlation between nm23 expression level and metastatic potential has been demonstrated in different malignancies. This study evaluated the prognostic value of nm23 in gastrointestinal stromal tumors (GISTs). METHODS: Immunohistochemical expression level of nm23 was studied in a total of 32 patients with localized GISTs. The relationship between the expression level of nm23 and patient outcome was investigated. RESULTS: A tumor size of 10 cm or more and a mitotic rate of 10 or more per 50 high-power fields were not significantly associated with the metastasis risk (p = 0.60 and 0.55, respectively). Tumors with high expression of nm23 tended to have significantly lower metastatic potential (p = 0.02). The median survival was significantly longer in patients with high expression of nm23 (p = 0.007). CONCLUSION: These results suggest that expression level of nm23 may be considered as a prognostic predictor in GISTs. Future studies with larger patient numbers will be essential to confirm the prognostic significance of nm23 in patients with GIST.

Transthoracic needle biopsy: factors effecting risk of pneumothorax.

OBJECTIVE: to evaluate the factors that could effect the risk of pneumothorax in patients undergoing transthoracic biopsy. MATERIAL AND METHODS: variables that could increase the risk of pneumothorax were evaluated in 453 CT-guided transthoracic biopsies. Factors were evaluated in two groups: (1) lesion related (presence of emphysema around the lesion, lesion depth, cavitation, presence of fissure/atelectasis and pleural tag in the needle trajectory); and (2) procedure related (biopsy type, needle size, number of passages, level of experience of the operator). All variables were analysed by chi2 test and multivariate logistic regression statistics. RESULTS: pneumothorax was developed in 85 (18.8%) out of 453 procedures. A chest tube was inserted in ten (11.7%) of them. Variables that were significantly associated with an increased risk of pneumothorax were depth of the lesion (P<0.001) and severity of the emphysema (P<0.01). CONCLUSION: the length of the lung parenchyma traversed during the biopsy is the predominant risk factor for pneumothorax in patients undergoing CT-guided transthoracic biopsy. The risk of pneumothorax was also increased with the severity of the emphysema around the lesion.

Plasma anti-oxidant status and lipid profile in non-gravida women with a history of pre-eclampsia.

OBJECTIVE: To investigate the total plasma anti-oxidant status, the plasma lipid profile and the uterine artery Doppler velocity waveform in formerly pre-eclamptic women. METHODS: Thirty-two formerly pre-eclamptic, non-gravida women constituted the study group, while 28 age-matched non-gravida women who had never had pre-eclampsia served as control subjects. On days 17-19 of their menstrual cycle, fasting plasma samples were collected for total anti-oxidant status (TAS) and lipid profile evaluation, and uterine artery Doppler velocity waveform studies were performed. Results were analyzed with Mann-Whitney U-test and Pearson correlation analysis. RESULTS: There was no significant difference between the groups in means of the uterine artery Doppler velocity waveforms and the plasma lipid levels, but body mass index values were significant (P < 0.005). The TAS value was subnormal in 72% of the formerly pre-eclamptic group and in 35% of the control group. The mean plasma TAS value was 1.20 +/- 0.05 mmol/L and was significantly lower in the study group when compared with the control group (P < 0.05). CONCLUSION: The current study reveals significantly decreased TAS in women with a history of pre-eclampsia, which may have an important role in pathophysiology.

Investigation of genetic susceptibility to non-small cell lung cancer by fragile site expression.

Fragile sites are non-staining gaps and breaks in specific points of chromosomes that are inducible by various culture conditions. Previous studies have shown that various clastogenic agents increase expression of fragile sites. In this study, the expression of common fragile sites induced by aphidicolin was evaluated on prometaphase chromosomes obtained from peripheral blood lymphocytes. Chromosomal aberrations and fragile site expression of 60 individuals, including 20 patients with non-small cell lung cancer (NSCLC), 20 of their clinically healthy family members, and 20 age-matched normal healthy controls without history of any cancer type were studied. Both the proportion of damaged cells (P < 0.001) and the mean number of gaps and breaks per cell (P < 0.001) were significantly higher in both the patients and relatives' groups when compared with the control group. However, they were insignificant when the patients were compared to their relatives (P > 0.05). We determined four aphidicolin type common fragile sites in our study. These sites in patients with NSCLC and relatives were the following: 1p21, 2q33, 3p14, and 16q23. In these fragile sites, 2q33, 3p14, and 16q23 sites were statistically significant when compared with control group (P < 0.001, P < 0.0005, and P < 0.05, respectively). Consequently, we believe that fragile site studies may be helpful to detection of cancer risk.