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...