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...