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...