Fever +backpain +farm animal >>> Brucella
Fever + meningism in Haji>>> Meningococci type A
Fever + hepatosplenomegaly +headache + relative bradycardia >>> Typhoid
Fever + severe retro orbital headache + Asia >>> Dengue fever
Diarrhoea in a number of patients or outbreaks >>> Norovirus
Diarrhoea within 24 hours after a meal >>> salmonella or compylobacter if after 24 hours immediately ( may be bloody)
Septic arthritis >>> gonococci if young …Staph aureus if older
Meningitis after head trauma >> Staph aureus
Pneumonia in alcoholic >> klebsiella
Diarrhoea in HIV >>> cryptosporidium first possibility …CMV if with esophagitis and very low CD4