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...