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...