What health means, and which germs cause typhoid, pneumonia, the common cold, dengue, chikungunya, malaria, amoebiasis, ascariasis, filariasis and ringworm. You follow the malarial parasite through a mosquito and a person, and learn how clean water, clean food and control of mosquitoes prevent disease.
3 lessons, about 1 h 30 min3 simulations11 problems3 practice questionsPython in every lesson
Health is more than the absence of disease. A disease that passes from person to person is caused by a pathogen, such as a bacterium, a virus, a fungus, a protozoan or a worm. This lesson names the pathogen, the way of spreading and the symptoms of typhoid, pneumonia, the common cold, dengue and chikungunya.
Malaria is caused by a protozoan, Plasmodium, and spread by the female Anopheles mosquito. The parasite lives in two hosts. It multiplies in the liver and in the red blood cells of a person, and the sexual stages unite in the gut of the mosquito. The fever comes when many red cells burst together.
Amoebiasis, ascariasis, filariasis and ringworm are caused by a protozoan, a roundworm, a filarial worm and fungi. Most diseases are prevented by personal hygiene, public hygiene, control of vectors and vaccination. A short weekly routine of emptying water containers breaks the life cycle of a mosquito.
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