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...