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...