Neutralizing antibodies associated with exposure factors to Orthopoxvirus in laboratory workers.

Extensive use of Vaccinia virus (VACV) in research has led to associated accidental human exposure in laboratories worldwide. In spite of the social and economic relevance of Bovine Vaccinia outbreaks in Brazil, national data concerning laboratory workers handling these infectious agents are relatively scarce. Therefore, a serological survey was conducted in a Brazilian laboratory to evaluate staff exposure to orthopoxviruses (OPVs). Information concerning direct work with OPVs, vaccination status and laboratory accidents was collected and correlated to serology results. This study presents an opportunity for discussion of routine procedures involving OPVs in laboratories and their intrinsic risks. Aspects of the live attenuated smallpox vaccine are also discussed.