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...