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...