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...