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...