34 The endotoxin is responsible for symptoms caused by which of the following or

Question

34 The endotoxin is responsible for symptoms caused by which of the following organisms? N. meningitidis. b. S. pyogenes d. C. tetani. C. botulinum 5) Smallpox can be controlled by a) Antibiotics b) Antiserum Vaccination d) solation of infected persons e) None of the above 36 Which of the following may be spread by respiratory secretions? ) Measies b) Influenza d) e) Smallpox All of the above Only A and C above 37 Whieh of the following is an intrecellular parasite? Rickettsia. e. Bacillus 38) The main antibiotic effective against Salmonella typbosa is a) Penicillin Chloramphenicol Sulfanilamide e) d) None of the above 9IG and IgMl antibodies. Autoimmunity is due to bIgA antibodies. c. IgD antibodies. d. IgB antibodies. e. All of the above.

Explanation / Answer

34) ans is a) N meningitidis . Enditoxin is a bacterial toxin present in outer membrane of gram negative pathogen such as E. Coli, salmonella, shigella, psuedomonas etc. Lipopolysaccharide, lipid A portion is responsible for toxicity. These toxins are heat stable, weak antigenic, not converted to toxoid and usually produce fever in host by releasing interleukin 1. Here, in option all other are gram +ve bacteria with no endotoxin only meningitidis is gram -ve bacteria with endotoxin.

35) ans is c) there is no cure for small pox , but vaccination can be used effectively to prevent infection from developing if given period of upto 4 days after person has been exposed to virus.

36) ans is b) many disease caused by respiratory droplets that spray into air when an infected person coughs or sneezes. These diseases are influenza, mumps, whooping cough, meningococcal disease etc.

37) ans is a) intracellular parasite are capable of growing and repeoducing inside the cell of a host. Here, rickettsia are obligate intracellular parasites. It is spread by arthropod vector.

38) ans is c) chroloamphenicol is an antibiotic effective against salmonella typhosa.

39) ans is e) all of the above

Autoimmunity means immune reponse of an organism against its own antigen. Due to genetic or environmental changes B cell start to produce antibody that are react with self antigen. All kind of ab are produced but mainly IgG, IgM.

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