What are the causes of Fever with chills and rigor ?
Pyelonephritis, pneumonia, lung abscess, acute cholangitis, malaria, kala-azar, sepsis
Simply, (chills) is a feeling of coldness, while (rigor) is chills with shiverings, i.e. Rigor is more severe than chills
Are you sure about typhoid and HIV? I think it's not fever with rigor and about typhoid it is step ledder pattern type of fever..