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...