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...