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...