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...