Surgical removal of thymus of a new born shall result in the failure to produce

‘Black death' is related with

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What precautions should be taken to avoid smoking ?

Assertion : Escherichia coli, Shigella sp. and Salmonella sp. are all responsible for diarrhoeal diseases.

Reason : Dehydration is common to all types of diarrhoeal diseases and adequate supply of fluids and electrolytes should be ensured.