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Typhoid is a bacterial disease caused by Salmonella typhi, which spreads through contaminated food and water. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.
Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Human Health and Disease, Topic: Immunity, diseases and health maintenance.
IgM is the first antibody produced during an initial immune response to an infection.
Ref: NCERT Class 12 Biology Chapter 7: Human Health and Disease Immune Disorders - Allergies Autoimmunity and AIDS
In 1898, 'M.W. Beijerinck' made a monumental biological discovery. According to NCERT, he demonstrated that the filtered, cell-free extract from tobacco plants infected with the mosaic disease could actively cause the same infection in completely healthy plants. To describe this mysterious, soluble infectious agent, he famously coined the descriptive Latin phrase 'Contagium vivum fluidum' (infectious living fluid).
Ref: NCERT Class 11 Biology > Chapter 2: Biological Classification > 2.6 Viruses, Viroids, Prions and Lichens
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