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...