Test: Diseases In Humans And Immunity

The antibody recognizes a small portion of the antigen called the antigenic determinant or epitope. Each antibody recognizes and binds to a specific antigen in a lock and key type model. The variable regions , which make up the two identical antigen-binding sties, are different in each specific type of antibody, giving these sites specific shapes that fit certain antigenic epitopes. The remainder of the molecule consists of light and heavy chain constant regions where these amino acid sequences vary little form antibody to antibody.

Snake antivenom is a medication made up of antibodies used to treat snake bites by venomous snakes. It is a type of antivenom.
It is a biological product that typically consists of venom neutralizing antibodies derived from a host animal, such as a horse or sheep. The host animal is hyperimmunized to one or more snake venoms, a process which creates an immunological response that produces large numbers of neutralizing antibodies against various components (toxins) of the venom. The antibodies are then collected from the host animal, and further processed into snake antivenom for the treatment of envenomation.

The combination of antibodies and complement promotes rapid clearing of pathogens. The production of antibodies by plasma cells in response to an antigen is called active immunity and describes the host's active response of theimmune system to an infection or to a vaccination.

Antibodies are produced by specialized white blood cells called B lymphocytes (or B cells). When an antigen binds to the B-cell surface, it stimulates the B cell to divide and mature into a group of identical cells called a clone.

Japanese encephalitis (JE) is a disease spread through mosquito bites. Symptoms usually take 5-15 days to develop and include fever, headache, vomiting, confusion, and difficulty in moving. Symptoms that develop later include swelling around the brain and coma. Japanese encephalitis is a serious disease that may cause death.

The female Anopheles mosquito when bites an infected person,the malarial parasites enter into the mosquito's body and undergo further development to form sporozoites in the intestine that finally move to salivary gland of the insect.

Microorganisms that cause disease are collectively called pathogens.
Pathogens cause disease either by disrupting the body's normal processes and/or stimulating the immune system to produce a defensive response, resulting in high fever, inflammation and other symptoms.

Sporozoite is the infective stage of the malarial parasite. They are present in the saliva of infected female anopheles mosquito.

The baby is given the following vaccines from the first month to the third month:
1& (½) DTaP (diphtheria, tetanus, acellular pertussis) vaccine
2 &(½)Hib (Haemophilus influenzae type b) vaccine
3 &(½)IPV (polio vaccine)

Cells develop from "pluripotential hematopoietic stem cells" starting from a gestational age of about five weeks. They circulate through various organs in the lymphatic system as the foetus develops. T and B lymphocytes are the only units of the immune system that have antigen-specific recognition powers; they are responsible for adaptive immunity. In other words, the T and B cells are important in the immunity that vaccination promotes.

Both sickle cell anaemia and Huntington's chorea are congenital genetic disorders. Sickle cell anaemia was first opened by James Herrick (1904). In this disease the patient's haemoglobin level reduced to half of the normal and the RBCs become sickle shaped. A single mutation in a gene can cause sickle cell anaemia.

Huntington's chorea is caused by autosomal mutation which is dominant. The gene is present on chromosome number 4.

Acquired Immune Deficiency Syndrome or AIDS is a set of symptoms caused by the HIV virus. It is in fact, the most advanced stage of infection caused by HIV. This disease modifies and corrupts the immune system, making people susceptible to infections and diseases. The susceptibility worsens as the syndrome progresses.

The function of IgE antibody as mediators in allergic reactions of Type I is explained by their ability to interact both with antigen and with receptor molecules on the membrane of blood basophils and tissue mast cells. However, it is not understood how the interaction of an allergen with cell-bound IgE antibody will induce basophil (mast) cells to release a great number of biologically active substances of which some will be further discussed at this meeting, nor is it known what role the IgE-mast cell system plays in the development and control of a normal immune response.

Widal test is a serological test for typhoid or enteric fever.ESR is done to check out the concentration of Erythrocytes in blood.PCR is done to amplify the amount of DNA molecules.ELISA is done in AIDS.

Mosquitoes become infected when they feed on a person already infected with the virus. Infected Mosquitoes can then spread the virus to other people through bites. Chikungunya virus is most often spread to people by Aedes aegypti and Aedes albopictus mosquitoes. These are the same mosquitoes that transmit dengue virus.