Indigenous hepatitis E virus infection in England: more common than it seems.

BACKGROUND: Indigenous hepatitis E virus (HEV) is increasingly diagnosed in England due to a better awareness and understanding of the virus. However, the true burden of infection and therefore its implication to public health remains undefined. OBJECTIVES: To estimate the HEV seroprevalence in the general population and to investigate how the risk of HEV infection had fluctuated over time. STUDY DESIGN: Two sample collections stratified by age ranging from 1 to 80 years, were screened for HEV IgG antibody. The two collections were separated by 13 years enabling the average incidence between 1991 and 2004 to be estimated. Additional force of infection calculations were also undertaken. RESULTS: An overall HEV antibody prevalence of 13% was determined, increasing with age and peaking at 25% in those aged over 50 years. Analysis of the two sample collections demonstrated a temporal shift in seroprevalence indicating that the risk of acquiring HEV infection was not solely age dependant. Data showed that the force of infection had been particularly high in the middle of the 20th century but had subsequently decreased. Current HEV incidence estimates revealed that the incidence did not vary in different age groups. CONCLUSIONS: This study indicated a high anti-HEV seroprevalence in England and that there was a period of increased risk of acquiring HEV infection which has now decreased. Incidence estimates show that shared risk factors still exist for acquiring HEV infection across all age groups in England.

Lack of serologic evidence of Neospora caninum in humans, England.

Retrospective testing of 3,232 serum samples from the general population and 518 serum samples from a high-risk group showed no evidence of human exposure to Neospora caninum in England. Results were obtained by using immunofluorescence antibody testing and ELISA to analyze frequency distribution.

Sero-epidemiological patterns of Epstein-Barr and herpes simplex (HSV-1 and HSV-2) viruses in England and Wales.

The aim was to carry out a population-based sero-prevalence survey of Epstein-Barr virus (EBV) across a wide age range in England and Wales and to identify any associations between EBV and herpes simplex virus types one and two (HSV-1 and 2). Sera from an age-stratified sample of 2,893 individuals, submitted for diagnostic purposes to 15 public health laboratories in England and Wales in 1994, were tested for immunoglobulin G (IgG) antibody to EBV. The samples had been tested previously for IgG antibody to HSV-1 and HSV-2. The serological profile of EBV was consistent with an endemic infection with peaks in transmission in those less than 5 years old and in young adults. An age adjusted analysis found a significant association between EBV and HSV-1 seropositivity that is most likely explained by similarities in their mode of transmission. The very low seroprevalence of HSV-2 in this sample complicated the comparisons of EBV and HSV-1 with HSV-2. Any associations were most likely explained by chance. Given the association between EBV and HSV-1, it is likely that recently documented epidemiological changes in HSV-1 also apply to EBV. Continuing surveillance of these herpes viruses is necessary as the predicted changes could have a significant public health impact, especially in the young adult population.