for example pneumococcal pneumonia cause(etiology ): pneumococcus condition: cold. tired pulmonary tuberculoSIS cause: tubercular bacillus condition: worry, malnutrition IlL. pathogenesis of disease It studies how the etiology can cause the disease in the bodyfor example pneumococcal pneumonia cause(etiology): pneumococcus condition: cold, tired pulmonary tuberculosis cause: tubercular bacillus condition: worry, malnutrition Ⅲ. pathogenesis of disease It studies how the etiology can cause the disease in the body