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...