▁Canada , ▁the ▁Canadian ▁Institute ▁of ▁Health ▁Research , ▁and ▁other ▁organizations ). ▁ ▁Cont ain ment ▁▁ ▁Human ▁path og ens ▁are ▁class ified ▁into ▁risk ▁groups . ▁The ▁criteria ▁to ▁determine ▁the ▁group ▁includes ▁the ▁level ▁of ▁risk ▁to ▁the ▁health ▁of ▁a ▁person ▁or ▁to ▁public ▁health , ▁as ▁well ▁as ▁the ▁lik elihood ▁that ▁the ▁human ▁path ogen ▁will ▁actually ▁cause ▁disease ▁in ▁a ▁human , ▁and ▁whether ▁treatment ▁and ▁prevent ative ▁measures ▁are ▁available . ▁It ▁can ▁depend ▁on ▁the ▁type ▁of ▁work ▁being ▁done ▁as ▁to ▁which ▁level ▁of ▁contain ment ▁is ▁needed ▁for ▁path og ens ▁from ▁specific ▁risk ▁groups ; ▁as ▁an ▁example , ▁cult uring ▁( or ▁growing ) ▁a ▁virus ▁or ▁b acter ium ▁requires ▁higher ▁contain ment ▁than ▁some ▁di agnostic ▁tests . ▁ ▁N ML ▁oper ates ▁Cont ain ment ▁Level ▁ 2 , ▁ 3 ▁and ▁ 4 ▁labor ator ies . ▁In ▁human ▁health ▁inf ect ious ▁disease ▁labor ator ies , ▁the ▁design ▁and ▁construction ▁of ▁the ▁facility , ▁the ▁engineering ▁controls , ▁and ▁the ▁training ▁and ▁techniques ▁of ▁staff ▁are ▁all ▁focused ▁on ▁protect ing ▁lab ▁workers , ▁containing ▁the ▁path og ens , ▁and ▁prevent ing ▁cont am ination ▁of ▁materials ▁to ▁ensure ▁accurate ▁diagn osis ▁and ▁research . ▁All ▁of ▁these ▁factors ▁vary ▁depending ▁on ▁the ▁level ▁of ▁contain ment . ▁ ▁The ▁vast ▁majority ▁( 8 7 . 7 %) ▁of ▁N ML ' s ▁lab ▁space ▁is ▁Cont ain ment ▁Level ▁ 2