▁( CL 2 ). ▁This ▁is ▁the ▁same ▁type ▁of ▁labor atory ▁found ▁in ▁do ctors ' ▁offices , ▁hosp it als ▁and ▁univers ities . ▁In ▁a ▁Level ▁ 2 ▁lab , ▁work ▁with ▁inf ect ious ▁materials ▁is ▁done ▁inside ▁a ▁b ios af ety ▁cabinet ▁( B SC ) ▁and ▁appropriate ▁personal ▁protect ive ▁g ear ▁is ▁worn ▁relative ▁to ▁activities ▁( g lo ves , ▁eye ▁protection , ▁lab ▁co ats , ▁g own s , ▁etc .). ▁R isk ▁Group ▁ 2 ▁path og ens ▁worked ▁with ▁in ▁Level ▁ 2 ▁can ▁cause ▁disease ▁but ▁are ▁not ▁a ▁serious ▁ha z ard ▁and ▁they ▁are ▁often ▁circul ating ▁in ▁the ▁community . ▁Environment al ▁cont am ination ▁must ▁be ▁minim ized ▁by ▁the ▁use ▁of ▁hand ▁was hing ▁s inks ▁and ▁de cont am ination ▁facilities ▁such ▁as ▁aut oc la ves . ▁Ex amples ▁include ▁E - coli ; ▁who op ing ▁c ough ; ▁and ▁season al ▁influen za . ▁ ▁N ML ▁also ▁has ▁Cont ain ment ▁Level ▁ 3 ▁( CL 3 ) ▁labor ator ies ▁( 8 . 6 % ▁of ▁lab ▁space ). ▁R isk ▁Group ▁ 3 ▁path og ens ▁may ▁be ▁transm itted ▁by ▁the ▁air bor ne ▁route , ▁often ▁need ▁only ▁a ▁low ▁inf ect ious ▁do se ▁to ▁produce ▁effects , ▁and ▁can ▁cause ▁serious ▁or ▁life - th re aten ing ▁disease . ▁CL 3 ▁emphas izes ▁additional ▁primary ▁and ▁secondary ▁bar riers ▁to ▁minim ize