Contagious diseases and their effect on human kind.

... Contagious diseases and their effect on human kind Contagious diseases are caused by pathogens which can pass from one person to another, many are spread by vectors which can carry disease without being affected themselves. Pathogens include viruses, protozoa, fungi, bacteria, parasites and worms. Contagious diseases can be transmitted by a number of methods. Direct contact can transmit a disease, this can occur by sexual intercourse in the case of syphilis or transmission through other surfaces like damp floors in the cause of athlete's foot. Another way disease is spread is via food, water or a vector. Bacteria such as Salmonella can affect chicken which has not been cooked properly and cholera can be transmitted through dirty water. An example of a disease carried by a vector is typhoid. Finally, diseases can be transmitted through blood, as in the case of AIDs. Cholera is an example of a contagious diseases caused by

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