Question

define diphtheria ...​

Answer 1

Diphtheria is a serious infection caused by strains of bacteria called Corynebacterium diphtheriae that make a toxin (poison). It is the toxin that can cause people to get very sick. Diphtheria bacteria spread from person to person, usually through respiratory droplets, like from coughing or sneezing.

Answer 2

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Definition is given below ✍ (1)

an acute and highly contagious bacterial disease causing inflammation of the mucous membranes, formation of a false membrane in the throat which hinders breathing and swallowing, and potentially fatal heart and nerve damage by a bacterial toxin in the blood. It is now rare in developed countries owing to immunization.

Another definition is given below ✍ (2)

A serious infection of the nose and throat that's easily preventable by a vaccine.

Another definition is given below ✍ (3)

A sheet of thick, grey matter covers the back of the throat, making breathing hard

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