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...