Influence of climate change on emerging pathogens and human immunity.

Global warming can be defined as the detectable increase in average global temperature in the last ten years regarding frequency and intensity. Climate change represents a long-term detectable climatic variability. The climatic system of the earth is disrupted because of the continuous production of greenhouse gases, which raises the risk of the emergence and re-emergence of human pathogens. In this review, we aimed to present the different mechanisms of climate change that increase human/pathogen exposure, introduce the recent concept of disaster microbiology, and discuss the effects of climate change on zoonoses as well as the effects of climate change on antibiotic resistance and human health.

Insight on the hepatitis B virus and host immune mechanisms in the context of occult hepatitis.

Hepatitis B virus infection is the 10th leading cause of death around the world. Occult HBV infection (OBI) represents those with a viral load of < 104 IU/ml. Among permanent blood recipients, OBI appears to be the most common cause of posttransfusion hepatitis. Moreover, OBI may reduce hepatitis C virus (HCV) treatment responsiveness in people with chronic HCV infection, and OBI may become acutely reactivated when on immunosuppression or potentially contribute to chronic liver disease. Since most previous studies used either small sample sizes, diverse populations, or were cross-sectional in design, it is possible that using multiple techniques with varying sensitivity for HBV DNA measurement in the liver or serum will shed light on discrepancies in the impact of OBI in cases with chronic liver disease. The purpose of this research is to review many elements of OBI, such as its prevalence, the hepatitis B virus and host immune mechanisms, diagnostic procedures, clinical implications, therapy, and prevention strategies.