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...