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...