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...