None of these diseases pdf

Invertebrates are very common vectors of disease. A vector is an organism which spreads disease none of these diseases pdf one host to another. Invertebrates spread bacterial, viral and protozoan pathogens by two main mechanisms.

Either via their bite, as in the case of malaria spread by mosquitoes, or via their faeces, as in the case of Chagas’ Disease spread by Triatoma bugs or epidemic typhus spread by human body lice. Many invertebrates are responsible for transmitting diseases. Mosquitoes are perhaps the best known invertebrate vector and transmit a wide range of tropical diseases including malaria, dengue fever and yellow fever. Another large group of vectors are flies. Ticks and lice form another large group of invertebrate vectors.

Although invertebrate-transmitted diseases pose a particular threat on the continents of Africa, Asia and South America, there is one way of controlling invertebrate-borne diseases, which is by controlling the invertebrate vector. For example, one way of controlling malaria is to control the mosquito vector through the use of mosquito nets, which prevent mosquitoes from coming into contact with humans. Fever, lung, heart or mucous membrane symptoms. Bull’s-eye pattern skin rash around bite, fever, chills, fatigue, body aches, headache, joint pain. Fever, headaches, skin rash, body aches. This page was last edited on 24 October 2017, at 00:07. This is a featured article.

Click here for more information. This can occur over a few hours to a few days. Many but not all people fully recover. In those with muscle weakness about 2 to 5 percent of children and 15 to 30 percent of adults die. These people are usually back to normal within one or two weeks.

Those who are infected may spread the disease for up to six weeks even if no symptoms are present. The disease only occurs naturally in humans. Once infected there is no specific treatment. In 2016, there were 37 cases of wild polio and 5 cases of vaccine-derived polio.