Received: January 8, 2013 Revised: February 20, 2013 Accepted: February 27, 2013 KEYWORDS: fatality rate, incidence, medical service, typhoid fever, water service
Received: January 8,2013Revised: February 20,2013Accepted: February27, 2013KEYWORDS:fatality rate,incidence,medical service,typhoid fever,water service