False positive dengue NS1 antigen test in a traveller with an acute Zika virus infection imported into Switzerland.

We report the first case of an acute Zika virus infection imported into Switzerland by a traveller returning from Canoa Quebrada, Ceará state, in the north-eastern part of Brazil. Due to a false positive dengue virus NS1 antigen test, IgG antibody seroconversion and a suggestive clinical picture,an acute dengue fever was initially considered. However, because of lack of specific IgM-antibodies, stationary IgG antibody titre and a negative dengue virus PCR test result, a dengue virus infection was excluded and a cross-reaction with other, causative flaviviruses was postulated.

Awareness of vaccination status and its predictors among working people in Switzerland.

Background: Adult vaccination status may be difficult to obtain, often requiring providers to rely on individual patient recall. To determine vaccination status awareness and the sociodemographic predictors of awareness for tetanus, hepatitis A and B, tick born encephalitis (TBE) and influenza vaccination.

Methods: Multivariate analyses were used to evaluate a questionnaire survey of 10,321 employees (4070 women and 6251 men aged 15-72 years) of two companies in Switzerland.