Sleeping sickness is caused by protozoan organism namely Trypanosoma (shown in the image given below).
Kala-azar or black fever is caused by a protozoan parasite of genus Leishmania (shown in the image given below).Īcne is caused by staphylococci bacteria (shown in the image given below).
Some diseases are caused by the multicellular organisms such as worms. Some of the major agents of infectious diseases are viruses, bacteria, fungi, and some single-celled animals (protozoans). When microbes are the immediate causes of a disease, it is known as infectious diseases. asthma, osteoporosis, etc.Ĭhronic diseases, normally, have very severe long-term effects on people’s health as compared to the acute diseases. The diseases that last for a long period of time, even as much as a lifetime, are known as chronic diseases. Some diseases, last only for a short period of time, are known as acute diseases. The public cleanliness is the key of good health. Major causes of poor health are - the garbage, which is thrown in an open area nearby residence or streets, or/and the open drain water lying stagnant around the residence area. The health of an organism largely depends on his/her surroundings or the environment. Health means a state of mental, physical, and social well-being.
