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...