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...