<prompt> Which of the following is not associated with food poisoning?Onset with vomitingTenesmusLeukocytosisHigh skin subrface temperature  <response>: In case of food poisoning blood investigation should be normal. Leucocytosis is seen in cholera, a differential diagnosis of food poisoning. Reference:Park;s textbook of preventive and social medicine,K.Park,23rd edition,page no:240. p 