Important Diagnostic Points 
1:-Fever + constipation +relative bradycardia =Typhoid
2:-Fever (3 weeks) then 10 days free +arthralgia +lymphadenopathy + History of contact with milk products =Brucella
3:-Fever+tender hepatomegaly +GIT upset =ambeobic liver abscess
4:-Fever +chills +sweats+jaundice+travelling to endemic area =malaria
5:-Fever +lymphadenopathy+history of dealing with cats =Toxoplasmosis
6:-Night Fever = T.B , lymphoma , brucella or Malaria
7:-Fever + arthritis +UTI =gonococcal or chlamydia infection
8:-Fever +strawberry tongue =scarlet fever or kowasaki disease
9:-Fever +diarrhea +Heamolytic anemia =Hemolytic uremic syndrome or TTP
10:-Fever +fatigue +lymphadenopathy +bil hilar lymphadenopathy =sarciodosis or histocytosis X
12:-Fever +relative bradycardia=Typhoid
13:-Fever +low platletes+sub conjuctival hge = Dengue fever
14:-Fever +rigidity +history of atypical anti psychotic within 1 week =Neuroleptic Malignant syndrome
15-Fever +neck rigidty+photophopia+headache -+ agitation= meningitis
16-Fever +headache +nick stiffness+manifestation of cerebral dysfunction(aphasia , convulsion , monoplegia or flexion U.L and extension L.L ) ± urinary incontinence=encephalitis
17:-Fever + cardiac murmer +vegetations on Echo= infected endocarditis
18:-Fever +High E.S.R >100+renal impairment+hypercalcemia in old age =multiple myloma