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...