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...