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...