[Sawdust in autopsies: production, spreading, and contamination]

Airborne infections are well known in clinical medicine (transport of bacteria by aerosols). During autopsies floating, respirable kinds of bone dust are produced, depending on the type of saw. Experiments were carried out with oscillating saws (without/with exhauster) and manual saws (autopsy of cranial cavity). The intention was to characterize and quantify the sawdust produced by the different saws. Furthermore, we wanted to find out whether bacteria are transported by these aerosols. Bone dust was collected with adhesive microscopic slides. Alizarin red was used for solid histochemistry of bone particles. Quantification was carried out by an eyepiece micrometer. Airborne particles and bacteria were identified macroscopically per unit of time. The oscillating saw without exhauster produced sawdust in large quantities. This dust was respirable and had suspension power for hours. There was a remarkable reduction of sawdust by an integrated exhauster. Spreading of particles carrying bacteria/saccharomycetes was seen over 6-8 m. There is a very low risk of an airborne infection when utilizing a manual saw (production of particles similar to chippings, absence of suspended sawdust). It is necessary to take every precaution against airborne infections by wearing breathing masks and safety goggles when using an oscillating saw.