there  was a  crowdsourced vaccine,   
  that could  be created regionally by  
    most  pharmaceutical   companies    
   without  much  effort, and  it  was  
   estimated   that  it   had   saved   
      tens      of      millions.       
                                        
 but it was not  officially recognized by 
 the world  health organization,  and  as 
 such  did not give what  the  sanctioned 
 (and   unobtainable)   ones   did:   the 
 subskin chip  that  would  let you enter 
       (or     leave)      cities.      
                                        
  and that's why, eventually, we would  
   create  our  own chips. they  were   
  larger than the official ones, and a  
    little  unstable,   and   needed    
   maintenance.  but   they  worked!    
  or, they  would work together with a  
   little something to make the  guard  
     look    the     other     way.     
                                      
                                      
                                          
    but the scanner showed green, so...