More people are at risk of infectious diseases than at any other time on history. Infectious diseases are worldwide problem requiring worldwide attention. Infectious diseases can weaken the strength of a nation's resources. In developing nations this poses even a greater threat. Diseases are threatening the economic stability of many developing nations. 50,000 people die everyday from infectious disease.

Rift Valley Fever infects both livestock and humans. Rift Valley Fever is most commonly found in regions of eastern and southern Africa. It also exists in Madagascar and sub-Saharan Africa. The Bunyaviridae family includes the Rift Valley Fever disease. It is primarily spread from infected mosquitoes, who then infect animals. Generally they infect domestic animals, such as buffalo, cattle, sheep, camels and goats. Once the livestock are infected, other mosquitoes can spread the disease. It is also possible that the infection can be spread from other biting insects.

The Rift Valley Fever outberak of 1997-1998 in eastern Africa killed both humans and livestock. It economically hurt

Severe cases also require fluid replacement. People who develop severe diarrhea and vomiting should seek medical attention immediately. Fewer than 1% of cholera patients die with rehydration.

Control of the disease is still a major medical problem in several countries. The World Health Organization estimates that 78 percent of the population in less developed countries is without clean water and 85 percent without adequate fecal waste disposal(1). Epidemics of cholera occurred in 1953 in Calcutta, India; between 1964 and 1967 in South Vietnam; among Bangladeshi refugees fleeing to India during the civil war of 1971; and in Peru in 1991. The 1971 outbreak killed about 6500 persons.

trase in animals and the dairy indusrty.. the economy was crushed by trade imbargoes. Humans can get Rift Valley Fever in numerous ways. Humans can be infected from the mosquitoes or the bodily fluids of the infected animal. Contact such as slaughtering the infected animal can occur also. Symptoms include, an infuenza like illness, fever, liver abnormalities, muscle and back pain and vomitting. In the early stages of Rift Valley Fever, these symptoms are some times mistaken for meningitis. This fever may also perceive itself to be haemorrhagic fever. Fatalities occur mostly in patients who have developed haemorrhagic fever.

Cholera is a diarrheal illness that is spread by contaminated water and food. It is caused by an infection of the intestine, and in many cases it can be very severe. It is characterized by lavish watery diahehrea, leg cramps and vomiting. Rapid loss of body fluids leads to dehydration and shock. The agent that causes cholera is the bacterium Vibrio cholerae, which was discovered by Robert Koch in1883. Without proper treatment, death can occur within hours. Even though, Cholera can be prevented very easily. In regions of the world with advanced water and sanitation systems, cholera is less widespread. In highly endemic areas, it is main

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