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...