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...