The infections have highly varied presentations and usually but not necessarily heralded by fever. Other symptoms depend upon the site of infection-like cough and shortness of breath for lungs, burning sensation while passing urine and flank pain for urinary tract, altered sensorium and confusion for brain etc. Fever may be absent and only vague symptoms like behavioural change, malaise, loss of appetite reduced urine output may be the only features in few conditions like extreme of ages, immunocompromised state like cancer patients, cases with sepsis etc.