Dead / weakened pathogen, syringe, needle, immune response, memory cells white blood cells Dead / weakened pathogen, syringe, needle, immune response, memory cells white blood cells Dead / weakened pathogen, syringe, needle, immune response, memory cells white blood cells Dead / weakened pathogen, syringe, needle, immune response, memory cells white blood cells Dead / weakened pathogen, syringe, needle, immune response, memory cells white blood cells Dead / weakened pathogen, syringe, needle, immune response, memory cells white blood cells Dead / weakened pathogen, syringe, needle, immune response, memory cells white blood cells Dead / weakened pathogen, syringe, needle, immune response, memory cells white blood cells Dead / weakened pathogen, syringe, needle, immune response, memory cells white blood cells Dead / weakened pathogen, syringe, needle, immune response, memory cells white blood cells Dead / weakened pathogen, syringe, needle, immune response, memory cells white blood cells Dead / weakened pathogen, syringe, needle, immune response, memory cells white blood cells Dead / weakened pathogen, syringe, needle, immune response, memory cells white blood cells Dead / weakened pathogen, syringe, needle, immune response, memory cells white blood cells Dead / weakened pathogen, syringe, needle, immune response, memory cells white blood cells Dead / weakened pathogen, syringe, needle, immune response, memory cells white blood cells Dead / weakened pathogen, syringe, needle, immune response, memory cells white blood cells Dead / weakened pathogen, syringe, needle, immune response, memory cells white blood cells Dead / weakened pathogen, syringe, needle, immune response, memory cells white blood cells Dead / weakened pathogen, syringe, needle, immune response, memory cells white blood cells