List Of Human Diseases Caused By Virus, Bacteria, Protozoa And Worm

The word disease implies that dis-ease (not easy). In other words, malfunctioning or improper functioning of various body parts like genetic disorder, hormonal imbalance, malfunctioning of the immune system of the body are some factors which affect human health. The diseases caused by intrinsic sources are called organic or metabolic diseases like cardiac failure, kidney failure, diabetes, allergies, cancer, etc and the diseases caused by extrinsic factors are Kwashiorkor, obesity, Night blindness, scurvy, etc. Some diseases are also caused by micro-organisms due to an unbalanced diet such as viruses, bacteria, and fungi, protozoans, helminths, worms, etc.; environmental pollutants, tobacco, alcohol, and narcotic drugs are also important extrinsic factors that upset human health.

Types of Diseases: On the basis of its nature, character and causes of its sadness is of two types:

1. Congenital Disease is the diseases which are present since birth. These are caused due to genetic abnormality or due to metabolic disorders or malfunctioning of any organ. They are basically permanent, generally not easily curable, and may be inherited to the children like Harelip, Cleft Palate, Club foot, etc. Also due to imbalance in the chromosomes the appearance of Mongalism, to born the blue baby due to cardiac disorder, etc are also some examples of it.

2. Acquired Disease is those defects or disorders which are not present by birth but appear due to the various causes and factors. These may be further categorized into the following heads:

(i) Communicable or infectious diseases: These are caused by a variety of pathogenic viruses, bacteria, protozoa, fungi, and worms. The pathogens are generally carried with the help of a vector.

(ii) Non-communicable or non-infectious or degenerative diseasesThese occur due to the malfunctioning of some organ or organ system in the body. It may be of various types like Deficiency diseasesThese occur due to the deficiency of some nutrients, minerals or vitamins, Cancerous diseasesAllergy, Genetic diseases.

Diseases Spread through Blood Transfusion

AIDS (Acquired Immuno Deficiency Syndrome): It destroys the immune system of the body & is caused by the Human Immunodeficiency Virus (HIV). There are two types of HIV namely HIV-1 and HIV-

2The most common virus currently associated with AIDS is HIV-1. A virus found in the blood of wild African green monkey called the Simian Immunodeficiency Virus (SIV) is similar to HIV-2. HIV is a retrovirus. It can synthesize DNA from RNA. The major cell infected by HIV is the helper T-Lymphocyte that bears the CD-4 receptor site. HIV progressively destroys T-Lymphocytes. The patient occasionally will suffer from swollen lymph nodes, mild prolonged fever, diarrhea, or other non-specific symptoms.

Disease caused by Viruses:

Chickenpox - It is caused by the Varicella-zoster virus.

Small Pox - It is caused by the Variola virus.

Common Cold - It is caused by Rhinovirus.

AIDS (Acquired Immuno Deficiency Syndrome) - It is caused by Human Immunodeficiency Virus (HIV).

Measles -It is caused by the Measles virus.

Mumps -It is caused by the Mumps virus.

Rabies - It is caused by the Rabies virus (Rhabdoviridae family).

Dengue fever -It is caused by the Dengue virus.

Viral encephalitis - It is an inflammation of the brain. It is caused by the rabies virus, Herpes simplex, poliovirus, measles virus, and JC virus.

Disease caused by Bacteria:

Whooping Cough - It is caused by a bacterium called Bordetella pertussis.

Diphtheria - It is caused by Corynebacterium diphtheriae.

Cholera - It is caused by Vibrio cholera.

Leprosy - It is caused by Mycobacterium leprae.

Pneumonia- It is caused by Streptococcus pneumonia.

Tetanus - It is caused by Clostridium tetani.

Typhoid - It is caused by Salmonella typhi.

Tuberculosis - It is caused by Mycobacterium tuberculosis.

Plague - It is caused by Yersinia pestis.

Disease Caused by Protozoans

Malaria is spread by Anopheles mosquitoes. The Plasmodium parasite that causes malaria is neither a virus nor a bacteria

Sleeping sickness: It is caused by Trypanosomabrucei.

Kala-azar: It is caused by Leishmaniadonovani.

Disease Caused by Worms

Tapeworm: They are intestinal parasites. It cannot live on its own. It survives within the intestine of an animal including a human.

Filariasis: It is caused by a thread.

Pinworm: It is caused by a small, thin, white roundworm called Enterobiusvermicularis.


Cancer: They are characterized by the uncontrolled growth and division of cells which leads to a mass of cells known as a neoplasm. Abnormal and persistent cell division localized in a particular region is called a benign tumor.

Gout: It results from the accumulation of uric acid crystals in the synovial joints. It is a disease associated with an inborn error of uric acid metabolism that increases production or interferes with the excretion of uric acid.

Haemophilia is called bleeder's disease. It is a disorder that is sex-linked and is a recessive condition. In a patient of hemophilia, blood clotting is deficient.

Haemophilia A, is characterized by a lack of anti- hemophilia globulin factor VIII. About four-fifths of the cases of hemophilia are of this type.

Haemophilia B or Christmas disease results from a defect in the plasma thromboplastin component.

Hepatitis: It is a viral disease, causes hepatic anorexia resulting in liver damage (liver cancer) or jaundice. It is transmitted by the fecal-oral route. Children and young adults are susceptible to it and no vaccines are acceptable.

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