Why do we need to give toxoid treatment in diptheria

Why do we need to give toxoid treatment in diptheria…because already the patient developes antibodies if the original bacteria enters the body??

The time taken by the body to form a decent titre of antitoxin is not fast enough to neutralise the antitoxin in the blood which may lead to complications like myocarditis etc.

That’s why we need to give the Toxoid ASAP