Microbes and disease

microorganisms Pathogens (cause disease) Microscopic Bacteria (cause cholera, boils, MRSA,TB,typhoid) Viruses (cause warts,polio,flu,mumps,measles) Fungi (cause athletes foot, ringworm) Parasites also cause disease but these are not microorganisms ( eg fleas, worms)

Pathogens (cause disease)

Microscopic

Bacteria (cause cholera, boils, MRSA,TB,typhoid)

Viruses (cause warts,polio,flu,mumps,measles)

Fungi (cause athletes foot, ringworm)

Parasites also cause disease but these are not microorganisms ( eg fleas, worms)

Important scientists in this area Ignaz Semmelweiss – noticed that when doctors washed their hands fewer women died giving birth Louis Pasteur – proved germs in air caused disease Joseph Lister – developed carbolic soap and ensured surgeons and their instruments were cleaned before operations

Ignaz Semmelweiss – noticed that when doctors washed their hands fewer women died giving birth

Louis Pasteur – proved germs in air caused disease

Joseph Lister – developed carbolic soap and ensured surgeons and their instruments were cleaned before operations

Cleaning chemicals Disinfectants - for surfaces Antiseptics - for wounds/sores Why cleaning is important – good hygiene removes dirt/grease that pathogens stick to and use as a source of energy to multiply

Disinfectants - for surfaces

Antiseptics - for wounds/sores

Why cleaning is important – good hygiene removes dirt/grease that pathogens stick to and use as a source of energy to multiply

Protection against disease Skin - barrier Blood clots and scabs Tears Hairs in nose filter dirt Mucus in nose and bronchi sticks to dirt/dust Acid in stomach kills microbes White blood cells – ingest microbes/make antibodies Vaccination – with weak/dead microbe to make antibodies Antibiotics – drugs to kill bacteria

Skin - barrier

Blood clots and scabs

Tears

Hairs in nose filter dirt

Mucus in nose and bronchi sticks to dirt/dust

Acid in stomach kills microbes

White blood cells – ingest microbes/make antibodies

Vaccination – with weak/dead microbe to make antibodies

Antibiotics – drugs to kill bacteria

homework Read p38-9 about drug development Find out about the drug trials that went wrong at northwick park hospital in North London Revise the whole topic ( first chapter in your text book) Practise tests next week

Read p38-9 about drug development

Find out about the drug trials that went wrong at northwick park hospital in North London

Revise the whole topic ( first chapter in your text book)

Practise tests next week