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...