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...