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...