Diphtheria is caused by
Poisons released by living bacterial cells into the host tissues
Poisons released from dead bacterial cells into the host tissues
Poisons released by virus into host tissues
Excessive immune response by the host's body
A person is suffering from frequent episodes of nasal discharge, nasal congestion, reddening of eyes and watery eyes. These are the symptoms of
Which of the following is not correctly matched
When children play bare footed in pools of dirty water and flood water, they may suffer from diseases like