To determine the effect of different doses of Salmonella enteritidis on immunocompetent cells, the thymus, bursa of Fabricius, and peripheral blood were examined. One-day-old chickens were orally infected with 2 × 102CFU/ml (low dose) and 2 × 108 CFU/ml(high dose) of S. enteritidis PT4. Subsets of T lymphocytes (CD3, CD4, and CD8), and BU1b cells using an indirect immunofluorescent method and flow cytometry were analysed on days 7, 10, 14, 21, and 27 postinoculation (dpi). The actual number of lymphocytes in the peripheral blood showed a significant increase in the low dose group (P < 0.05) on day 21 pi, and in the high dose group on day 27 pi (P< 0.001) compared to controls. The increase of CD3+, CD4+, and CD8+ T cells was observed in both infected groups compared to the controls from day 14 pi, significant on day 21 pi (P < 0.05) in the high dose group. The subpopulation of CD8+ was higher also on day 27 pi (P < 0.01) compared with the values of the control group. The subpopulation of BU1b+ B cells in both infected groups showed higher values, but without significant differences from controls. The thymus T lymphocytes showed a significant decline in CD3+ T cells on day 7 pi, whereas CD4+ T cells were significantly (P < 0.05) increased on day 7 pi in both infected groups. The bursal lymphocytes showed a decrease in BU1b+ B cells in both infected groups compared with the control group, significant in the high dose group on day 21 pi (P < 0.05). These results indicate that S. enteritidis infection induced the changes in immunocompetent cells, included cellular and humoral immune response. Salmonella infection accelerated the maturation and differentiation of thymus T cells in the first phase of infection, what was secondarily reflected by increased number of studied T lymphocyte subpopulations in the peripheral blood from day 14 to 27 after infection. Similarly, it appears that the activation of B cells in bursa of Fabricius caused the decrease number of bursal B lymphocytes and increased number of these cells in the peripheral blood from day 14 to 27 pi in both infected groups.
A. A. Asheg(3-2003)

The Corona virus disease 19 (COVID-19) is a new global pandemic. World Health Organization (WHO) declared COVID-19 a public health emergency of international concern. Health Care Works (HCWs) are the primary sectors in contact with suspected patients. Thus, the knowledge, attitudes and practices of HCWs towards COVID-19 remain unclear. The objectives: To investigate the knowledge, attitudes and practices of Medical doctors about COVID-19 at Tripoli University Teaching Hospitals. Methods: This crosssectional survey was conducted from April 30 to 29 May, the week immediately after first case of COVID-19 reported in Libya. A pilot trail questionnaire was distributed and filled by taking the relevant information from medical staff doctors working at various medical and surgical units. The data coded according to variable and analysed by SPSS. Results: Of (250) participants, a total (100) of Medical staff doctors completed the surve\ (response rate 40%). The participants¶ qualification was (64%) MBBS, (14%) Master degree, (16%) PhD and (6%) professors. the mean age 35 years. (42%) were male and (58%) female participants. Most of the medical staff doctors (70%) were GPs, (22%) were specialists, (6%) were internship doctors and (2%) were consultants. Questionnaire survey revealed that (18%) of the respondents reported working experience of >20 years. The survey was considered if the Medical doctor in frontline healthcare workers (FLHCWs), our results demonstrate that, only 30% of medical staff doctors was provided care of COVID-19 patients while 70% was not in the FLHCWs. Most participants (79%) reported that no specific treatment of COVID-19. A significant proportion of medical doctors (68%) had good knowledge of the transmission, diagnostic method & prevention of COVID-19. According to the case report definition of WHO and ECDC, the survey results showed (69%) of the respondents reported that, the test should be repeated if the first RT-PCR results were negative from the patient represent the typical clinical symptoms of COVID-19. Our questionnaire survey revealed that (68%) of the medical staff doctors¶ participants agree that wearing face masks prevent the infection while (32%) reported that wearing face masks could not prevent the infection. Overall, Medical staff doctors in Tripoli University Teaching Hospital showed expected level of knowledge and attitudes about COVID-19. The findings survey suggests that due to the limited medical staff doctor¶s representative, it must be cautious when generalizing these findings to other medical doctors residing in other regions of the country. As intentional threat of COVID-19 continuous to emerge, the results survey highlights the importance of continuous health educational programs from the government and national health authorities that well improve and updated knowledge of the HCWs regarding COVID-19, which also result in increasing their attitudes and practices towards COVID-19. Further studies are warranted to confirm our findings. arabic 17 English 99
ِAbdusalam Sharef (12-2020)

This study amid to determine the prevalence of Salmonella enteritidis and multi-drug resistant in some chicken slaughterhouses in Tripoli -Libya. The study include three regions of Tripoli namely south, East and West regions. Five slaughterhouses were selected from each region. every chicken slaughterhouse was visited 3 time for sample collection with 2 weeks interval. Samples were collected from neck skin, crop and spleen from 5 chicken. Total of samples from all regions were 675. Every 5 samples were processed for isolation and identification by biochemical identification and serotyping and antibiotic sensitivity test. The total rate of isolation of Salmonella spp was found to be 15% and Salmonella enteritidis was 7%. The highest prevalence 9% of Salmonella enteritidis was recorded in south region of Tripoli, however, the highest prevalence of Salmonella spp was found in West region. the prevalence of Salmonella was significantly (P
Abdulatif Asheg, ’ohamed Fayz Othman(1-2019)