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...