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...