Recombinant HBV Surface Antigen (subtype ad)

Circulating T-FH(cT(FH)) cells express CXCR5, PD-1, and, when activated, ICOS, and release IL-21. According to the production of IFN-gamma, IL-4, and IL-17 and expression of FoxP3, these cells are also classified as cT(FH)1, cT(FH)2, cT(FH)17, and cT(FR)cells, respectively. This CD4(+)T-cell subset is pivotal to efficient humoral immunity, and pregnancy appears to favor IgG production. Here, not only pregnancy amplified the in vivo production of anti-HBsAg IgG in HBV immunized women, but the frequency of cT(FH)cells was directly correlated with estradiol levels. In vitro, pregnancy-related dose of 17-beta-estradiol (E2) directly increased the percentage of different cT(FH)subsets. While E2 and progesterone (P4) increased the proportion of differentiated T(FH)cells derived from naive CD4(+)T-cells, only E2 amplified the release of IL-21 in those cell cultures. In addition, E2 and P4 increased the proportion of memory B cells and plasma cells, respectively. In SEB-activated B/T(FH)cell co-cultures, E2, in the presence of P4, increased the production of total IgG. Finally, among the hormones, P4 was stronger in upregulating the percentage of IL-10(+)T(FR)cells. Collectively, our findings suggested that E2 and P4 cooperate in the humoral immune response by favoring the expansion of different cT(FH)and B cell subsets.

Objective: This study aims to investigate the injuries exposing health care workers to blood and body fluids, distribution of such injuries by occupation and level of experience of the health care worker, and potential prevention strategies for reduction of such hazards. Methods: Our study was carried out in a 836-bed tertiary care education and research hospital that employs 3612 health-care workers. Data from 116 sharps injuries, which occurred in our hospital in 2018, were retrospectively analyzed using IBM SPSS Statistics for Windows, Version 19.0 (IBM Corp., Armonk, NY, USA). The data were obtained from the forms filled by the infection control committee and the workplace doctor. Results: Analysis of the 116 injuries registered in one year by occupational groups, revealed nurses to be the most frequently injured group (42.2%), followed by auxiliary healthcare personnel (32.8%). Source was known in 56.9% of the injuries. In those cases, serological investigations revealed HBsAg positivity in 5.2%, anti-HCV positivity in 3.4%, and anti-HIV positivity in 1.7%. Of all injuries, 94.8% happened through percutaneous contact. Majority (75.9%) of the incidents occurred during day shifts (08:00-17:00), 15.5% occurred during evening hours (17:00-00:00), and 8.6% occurred during night shifts (00:00-08:00). Most of the injuries (46.6%) took place as an instrument was being removed from the field. Injuries most commonly occurred among professionals undergoing their first year of work experience (67.2%). Conclusions: Injuries with exposure to blood and body fluids pose a major risk to health care workers. Compatible with the similar reports in literature, nurses were the most frequently injured professionals in this study. We suggest that attention should be paid to education and surveillance of waste disposal, specifically of contaminated sharps.