Received: January 8, 2013 Revised: February 20, 2013 Accepted: February 27, 2013 KEYWORDS: fatality rate, incidence, medical service, typhoid fever, water service
Received: January 8, 2013 Revised: February 20, 2013 Accepted: February 27, 2013 KEYWORDS: fatality rate, incidence, medical service, typhoid fever, water service