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...