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...