This depends on the extent of the biohazard contamination, the nature of the contaminants, and the nature of your business. If the experts at our local company can successfully isolate the contaminated areas from your working areas, you should be able to keep working during cleanup.
However, if the biohazard is potentially highly contagious or if there’s a risk that it contaminated the HVAC system, you might need to shut down temporarily or work in a different location.