1. Wasfy MO, Oyofo BA, David JC et al. Isolations and antibiotic susceptibility of Salmonella, Shigella, and Campylobacter from acute enteric infections in Egypt. J Health Popul Nutr 2000; 18: 33–38.
2. Ivanoff B, Levine MM, Lambert PH. Vaccination against typhoid fever: present status. Bull World Health Organ 1994; 72: 957–971.
3. Agarwal K S, Singh S K, Kumar N et al. A study of current trends in enteric fever. J Commun Dis 1998; 30(3): 171–174.
4. Sood S, Kapil A, Das B, Jain Y, Kabra SK. Re-emergence of chloramphenicol-sensitive Salmonella typhi. Lancet 1999; 353: 1241–1242.
5. Sinha A, Sazawal S, Kumar R et al. Typhoid fever in children aged less than 5 years. Lancet 1999; 354: 734–737.