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...