[Draft] T9.3 Human Infection & Response + Drug Development

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Year 9 Topic 3 @ SGS

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51 Terms

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Disease

Caused by pathogens such as bacteria, viruses, protists or fungi.

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Pathogens

Microorganisms which cause disease

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Spread of Pathogens

Direct Contact, Water or Air

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Toxins

Created by bacteria in our body, making us feel ‘ill’

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Viruses

Live & reproduce inside the cell, causing damage

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Prevention of Disease

  • Basic hygiene

  • Destroying vectors (carriers)

  • Isolating the infected individuals

  • Vaccination

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Measels

Viral disease that can be fatal, spread by inhaling droplets from sneezes or coughs

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Symptoms of Measels

Fever and red skin rash

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Prevention of Measels

Vaccination during childhood

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HIV (Human Immunodeficiency Virus)

Viral disease which attacks the immune cells, spread by sexual contact or exchange of bodily fluids.

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AIDS (Acquired Immune Deficiency Syndrome)

Advanced stage of HIV. The body is too weak to fight other infections or cancers

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Symptoms of HIV

Initially causes a flu-like illness

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Treatments of HIV

Antiretroviral drugs

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Salmonella

Food poisoning spread in unhygienic food

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Symptoms of Salmonella Toxins

Fever, Cramps, Vomiting, Diarrhoea.

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Prevention of Salmonella

Poultry vaccinations

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Gonorrhoea

Sexually Transmitted Disease, caused by bacteria

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Symptoms of Gonorrhoea

Thick, yellow or green discharge from penis or vagina & pain during urinating

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Treatments of Gonorrhoea

Antibiotics or barrier contraception (Condoms)

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Malaria

Caused by a protist involved in the life cycle of a mosquito

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Symptoms of Malaria

Fevers, Vomiting, Diarrhoea. Can become fatal

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Prevention of Malaria

Preventing vectors (mosquitoes) from breeding and using bug nets

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Human Defence Systems

  • Skin

  • Nose

  • Trachea & Bronchi

  • Stomach

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Skin

Physical barrier that secretes antimicrobic substances

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Nose

Traps particles that could contain pathogens

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Trachea & Bronchi

Secrete mucus which traps pathogens. Cilia waft the mucus to the throat

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Stomach

Acid that kills the majority of pathogens

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Immune System Reactions

  • Phagocytosis

  • Antibody production

  • Antitoxic production

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Phagocytosis

Process of white blood cells engulfing and destroying pathogens

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Antibody Production

Producing specific antibodies that bind onto antigens of the pathogen.A

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Antitoxin Production

Counteract the effects of the toxins produced by the bacteria

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Vaccination

Injection of dead or inactive microorganisms to stimulate the production of antibodies

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Benefits of Vaccination

  • Can control lots of common communicable diseases effectively

  • Large outbreaks of disease (epidemics) can be prevented if a high percentage of people are vaccinated

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Downsides of Vaccination

  • Their efficacy is not guaranteed

  • You could have bad side effects to the vaccine

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Antibiotics

Medicine that kills bacteria, not viruses, in the body

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Resistant Bacteria

Bacteria mutations can cause resistance to certain antibiotics, so it becomes ineffective

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Preventing Resistant Bacteria

  • Avoiding over-prescription/usage of antibodies

  • Using the full course of antibodies

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Painkillers

Alleviate symptoms, but does not treat the disease/pathogen

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Examples of Painkillers

Paracetamol, Ibuprofen, Codeine, Aspirin

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Example of Antibiotics

Penicillin

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Importance of Plants in Medicine

Many chemicals derive from plants. Eg. Digitalis - Foxglove, Aspirin - Willow

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Pre-clinical Testing

Drugs are tested on human cells & tissues in the lab, and live animals.

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Clinical Testing

  • Drug is tested on healthy adults, who volunteer.

  • Dosage is gradually increased, and those with the illness are introduced to find the optimum dosage.

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Double Blind Trial

One group is given a placebo to see the actual effects of the drug, without the patients or doctors from knowing.

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Peer Review

Results are peer reviewed before publication to prevent false claims

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Monoclonal Antibodies

Genetically identical antibodies that target only one antigen

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Production of Monoclonal Antibodies

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