[CBSE AIPMT 2001]
Correct Option (a)
Reason : Salmonella typhi causes typhoid fever. The incubation period is about two weeks. The patient first suffers from high fever of 40°C and continual headache. Polio, TB and tetanus are caused by polio virus, Mycobacterium tuberculosis and Clostridium tetani respectively. Polio is being eradicated by polio vaccine. TB and tetanus can be cured by antibiotics.