The Widal test aids in diagnosing enteric fever, also known as typhoid and paratyphoid fever, which is brought on by consuming tainted food or water with Salmonella bacteria. Bacteria that cause this include Salmonella typhi and Salmonella paratyphi A, B, and C. Typhoid fever is brought on by the bacteria Salmonella typhi, which is disseminated through the intake of tainted food or water. It can be used to help determine if an individual has been exposed to S. Typhi infection within the past six months, as well as whether they have been exposed during pregnancy or birth (as part of their postpartum period). The growing antibody liters are advised to do the test on two blood samples at intervals of 7 to 10 days. Widal test in Delhi are relatively cheaper than other states. The usual value ranges may differ slightly between laboratories. Some laboratories may test various samples or use multiple metrics. Widal blood test in Delhi is very affordable depending on the facility where the test is being conducted