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...