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...