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...