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...