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...