Discussion and video relating steps being taken to lessen the contamination of the water supply resulting in the spread of water borne diseases. The main subject area today is malaria, how it is spread, and the infectious disease caused. Indicate that it is transmitted by a mosquito vector, the female anopheles mosquito. The protist Plasmodium is picked up by the female after biting an infected organism and spread to a second organisms when bitten. Stagnant water is the site of egg laying and larvae of the mosquito, along with contaminated water from waste. Discuss symptoms and geographic areas affected. Discuss ways to prevent the development of larvae, and some biological methods used to prevent fertilization of the eggs.