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...