The word "Biohazard" is now known to a good number of people. But the truth is perhaps that its exact meaning is not necessarily understood properly. 
Generally speaking, the meanings and contents of words tend to change as time goes on. That is the case with the word "Biohazard." Explanations about this word are found here with information on the transition, present modes and characteristics of biohazards.  
In addition, critical discrimination between the word "Biohazard" and words similar to it such as "Biosafety," "Biorisk" and "Bioterrorism" are presented from a citizen's standpoint.  
Biohazards are never fictional disasters but those likely to occur actually anywhere at any time. However, they can be controlled or prevented if we cope with them in a calm and reasonable manner.