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...