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...