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...