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...