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...