Test Details: The Typhidot - IgM and IgG tests are done to detect antibodies against Salmonella typhi. Salmonella typhi is responsible for causing typhoid fever. Contaminated food and water or close contact with an infected person cause typhoid fever. Signs and symptoms usually include; high fever, headache, stomach pain, constipation or diarrheal. This test is done: As a part of the fever panel In case of signs or symptoms of typhoid fever. The typhidot test becomes positive within 2 days of infection and separately identifies IgM and IgG antibodies. IgM shows recent infection whereas IgG signifies remote infection.