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...