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...