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...