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...