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...