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...