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...