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...