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...