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...