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...