Consider these vaccinations: MMR, DPT and SARS-2 coronavirus (COVID-19). What diseases does each cover. What type of organism is each. How consider the basic principle of the vaccine in how it works; What does each one inject into the patient to cause the patient to mount an immune reaction? The primary immune response is essentially non existent because a needle is used to pierce the skin and inject something into the body...WHAT type of thing is injected for each vaccine. Please do not list the specific molecule, just a description of the item injected. What is the primary white blood cell responsible for responding? Is the response humoral or cell mediated, and why? Which cell or immunoglobulin type is activated first, then which is the primary major response?.