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...