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...