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...