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...