Salinity is described as the mass in grams of the dissolved inorganic matter in 1 kg of water (Stumm and Morgan 1996). It is hence asserted as S‰in parts per thousand. Seawater has a notably uniform salinity between 33‰ and 37‰. Salinity is also usually measured using the electrical conductivity of water, or more correctly, its specific conductance. The units generally used are either Siemens.cm À1 or mhos.cm À1 (Harris 2009). Infectious disease (or communicable disease) is defined as a sickness caused by a specific infectious agent or its toxic product that appears from the transmission of that agent or its products from an infected person, animal, or reservoir to a susceptive host, either directly or indirectly through an intermediate plant or animal host, vector or inert environment (Last 1988). At the same time, infection is the word that characterizes the entry and development of an infectious agent in a human or animal body, whether or not it develops into a disease (Barreto et al. 2006).