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...