The weil felix test in Delhi test is a blood test that is used to detect some types of bacterial infections caused by the members of rickettsia family which includes some organisms that are responsible for diseases like spotted fever. It generally works for detecting the antibodies produced by your body in response to bacterial infections. The weil felix in Delhi test helps in diagnosing infections caused by bacteria. Next time a positive result might suggest exposure to the bacteria that helps your doctors and confirms the disease. The results from the test can also guide the doctors in prescribing appropriate treatment for the infection.