Chills

Infection (bacterial with a bacteremic abscess, viral, TB, fungal), Hodgkin's disease, drug and transfusion reactions, hypothermia, malaria.

Clubbing

 Pulmonary causes (bronchiectasis, empyema, lung abscess, bronchial carcinoma, fibrosing alveolitis, A-V malformations), cardiac (congenital cyanotic heart disease, infective endocarditis, unilateral aneurysm of the subclavian artery), gastrointestinal (ulcerative colitis, Crohn's disease, liver cirrhosis, malabsorption syndrome), congenital.