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...