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...