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...