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...