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...