High prevalence of previous dengue virus infection among first-generation Surinamese immigrants in the Netherlands.

BACKGROUND: A substantial portion of Dutch travellers is comprised of immigrants returning to their country of origin to visit friends and relatives (VFRs), including VFRs returning to dengue-endemic areas such as Suriname. Limited attention has been focused on dengue among immigrants, therefore it is unknown whether immigration has effect on the epidemiology of (severe) dengue among VFRs.To get more insight in the seroprevalence of dengue among Surinamese immigrants, we conducted a seroprevalence study on a convenience sample of first-generation Surinamese immigrants living in the Netherlands. METHODS: Blood samples were tested for IgG antibodies to DENV antigen serotypes (1, 2, 3 and 4). Gender, age, years lived in Suriname before immigration, history of yellow fever vaccination, and time between yellow fever vaccination and blood sample collection were examined as possible predictors for previous infection. RESULTS: Of the studied 400 Surinamese travellers with a mean age of 52 years (range 18-89), 37% were male. Serology suggestive of past DENV infection was found in 325 individuals (81.3%; 95% CI: 77-85%). The time lived in Suriname before immigration was the only significant predictor for previous DENV infection. CONCLUSIONS: Most first-generation Surinamese immigrants have evidence of past DENV infection, probably comparable to Surinamese inhabitants. Whether this influences the number of cases of (severe) dengue when travelling requires more study.

Unprotected casual sex equally common with local and Western partners among long-term Dutch travelers to (sub)tropical countries.

We studied casual sexual partnerships and consistency of condom use among Dutch long-term, travelers to (sub)tropical regions. Forty-two percent of casual sexual partnerships (n = 192/462) were with local partners, of which 39% were unprotected. Fewer travelers to Sub-Saharan Africa had casual sex, but partner's ethnicity was not significant in predicting condom use.

Hepatitis B viral load and risk of HBV-related liver disease: from East to West?

Chronic hepatitis B has a variable course in disease activity with a risk of clinical complications like liver cirrhosis and hepatocellular carcinoma. As clinical symptoms present in a late stage of the disease, identification of risk factors is important for early detection and therefore improvement of prognosis. Recently, two REVEAL-HBV studies from Taiwan have shown a positive correlation between viral load at any point in time and the development of cirrhosis and hepatocellular carcinoma. Due to differences in viral and host factors between Asians and other populations, it is unclear whether these results can be extrapolated to different populations. This manuscript will discuss viral predictors of hepatitis B related liver disease in relation to ethnic origin.

Risk behavior and social-cognitive determinants of condom use among ethnic minority communities in Amsterdam.

This study assessed sexual risk behavior and determinants of condom use among migrants in Amsterdam, The Netherlands. We tested the predictive utility of constructs derived from the health belief model and the theory of planned behavior. Data were collected by means of a cross-sectional study in a community sample of 537 Surinamese, Antillean, and sub-Saharan African heterosexual men and women randomly recruited from participants in an epidemiological study. Participants donated saliva for HIV testing and were interviewed using two structured questionnaires. Inconsistent condom use occurred in 82% of the primary partnerships and in 25% of the casual partnerships. Multivariate analyses, controlling for sociodemographic and behavioral factors, showed that perceived behavioral control and subjective norm regarding condom use were main social-cognitive determinants of consistent condom use. However, contrary to predictions, the relation between consistent condom use and sociodemographic and behavioral factors was not entirely mediated by these social-cognitive factors.