2objectives Define microbiology Describe the contributions of scientists to the conquest of diseaseIdentify basic health care procedures used to prevent and control disease
3Microbiology Study of microscopic (living ) things E.g. viruses, bacteria, algae, protists, fungiDerived from greek micro-small, bios=life and logy =the study of. These minute living orgnisms are referred to as microbes or microorganisms because they can only be seen through a microscope. The term microbiology encompasses the study of all microbes, including bacteria, fungi, parasites, and viruses.
4History of Microbiology 1590 – First compound light microscope Zacharias Janssen
5History 1676 –first observation of bacteria “animalcules” Anton Von LeeuwenhoekFather of Micro, Was by trade a dutch drapery merchant, and had no scientific educacation he had a keen knowledge and understanding of the art of lens grinding and optics. His highly inquisitive mind led him to test examine a diverse amount of materials. 300X magnification.
6Spontaneous generation or abiogenesis Life can suddenly or spontaneously arise from decomposing nonliving matter
7Decaying meat gave rise to maggots Sweat laden shirts stored with wheat in a dark area gave rise to miceHairs from horses tail when placed in water produced wormsFrancesco Redi disproved this with 3 jars guaze, parchment paper open. Other scientist suggested that gauze could not keep out microorganisms and that organic matter could give rise to microbes
8Lazzaro spallananzani Lazzaro spallanzaniPerformed experiments to disprove the theory of spontaneous generation.Conducted the boiled meat broth experiment in a sealed flaskDisputed the micro level theory of spon gen. he boiled meat broth in a flask and sealed the neck of the flask by melting it. If neck was broken microbes were allowed to enter and became turbid or cloudy with growth of animacules
9History 1796 – First vaccine (smallpox) Edward Jenner Was impressed by the fact that milkmaids in england who had contracted cowpox while milking, came immune to the ravages of smallpox. He tested this theory by transferring a small amt of the material from a cow pustule to the arm of an uninfected boy, six weeks later the boy was innoculated with smallpox and failed to develop.
10History 1857 – Germ Theory of Disease Louis Pasteur French biochemist devised several simple but clever experiments. PG 7. germ theory of fermentation, microorganisms are responsible for the fermentation of sugars while examining the spoilage of beer and wine. Yeast ferments sugar in grapes to produce alcohol, if bacterium enters alcohol is changed to aceitic acid and alters the taste or ruins the wine.
11Oliver wendall holmesSuggested that childbed fever a highly contagious disease, might be spread by the hands of doctors and nurses who went from one patient to another
12Ignaz phillipp semmelweis obstetrician Sometime later, noted death rates of patients being visited by physicians and medical students who had come from morgue or autopsy room were much higherEstablished first real safety precautions in a hospital. All hands had to be carefully cleansed before examining pt rooms to be kept very clean. Mortality rate on his ward dropped dramatically.
13Developed a method of killing heat resistant bacteria John TyndallDeveloped a method of killing heat resistant bacteriaHeat resistant bacteria = endospore. Heated and cooled repeated 5 times to kill all endospores Process of tyndallization.
14History 1867 Antiseptic Surgery Joseph Lister Applied pasteurs germ theory of disease to his surgical practice. If microbes could fall and grow on a nutrient broth, they could do the same on an open surgical wound= sepsis=death. Used carbolic acid (phenol) in the washing or disinfection of his hands and surgical tools. Sprayed the room, phenol on dressings. Today surgeons use the aseptic method in which surgical tools are sterilized prior to use.
15History 1884 Koch’s Postulates of Disease Transmission Robert Koch Developed elaborate technique of isolating and identifying specific pathogens that cause a specific disease. Koch and his pioneers were pioneers in isolating organisms in pure culture. First to isolate the bacterium that causes anthrax in sheep, took blood from sheep that had died of anthrax and then growing the bacteria in culture. Then in\jectected into other animals. Estalished rules for proving a organism causing a specific disease. Kochs postulates pg 9. discovered causitive agents to TB, diptheria, typhoid fever, cholera, and gonorrhea.
16Golden age of bacteriology Pasteur, lister, and KochPasteur institute paris 1888Germany infective disease institue Koch became professor
17History 1929 Discovery of Penicillin (first antibiotic) Still most widely used antibiotic, oldest and safest.Discovery of Penicillin(first antibiotic)Alexander Fleming
18History 1938 – First Electron Microscope The electron microscope is capable of magnifying biological specimens up to one million times. These computer enhanced images of 1. smallpox, 2. herpes simplex, and 3. mumps are magnified, respectively, 150,000, 150,000 and 90,000 times.ALLOWED VIROLOGIST TO SEE VIRUSES
20History 1954 Polio Vaccine Jonas Salk POST WWII BROUGHT ACTIVE RESEARCH INTO SOME OF THE MOST DREADED DISEASES. POLIOMYELITIS ARRESTED WITH VACCINE. MEASLES VACCINE PRODUCED. TODAY A VACCINE IS ROUTINE FOR FELINE LEUKEMIA VIRUS
21CHICKEN POX 1995 CONTRVERSIAL Disease not serious enough to warrant vaccineEffective about 10 years, child becoming adult and risk catching
22Haemophilus influenza type B Must part of all infant/children2,4,6 monthsCauses meningitis, pneumonia, pericarditis, osteomyelitisspread by respiratory secretions by direct person to person contact
23hepatitis A,B,C,D,E,F,G alphabet soup Cure not on horizon Good hygiene, educationHep C stealth disease blood to blood contact
24HIV/ Aids Linked to several conditions Karposis sarcoma Pneumocystitis Much research continues in the U.S and around the world