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...