Subjects

Biology

Infection and response

Plant disease

Symptoms and Spread of Communicable Diseases - GCSE Biology AQA

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Symptoms and Spread of Communicable Diseases - GCSE Biology AQA

Imy

@studywithimy

689 Followers

Communicable Diseases: Symptoms, Spread, and Treatment

This comprehensive guide covers various communicable diseases, their symptoms, modes of spread, and available treatments. It focuses on viral, bacterial, and protist-caused diseases affecting humans and plants, including measles, HIV/AIDS, Tobacco Mosaic Virus, Salmonella, gonorrhea, and malaria.

Key points:

Diseases are caused by different pathogens: viruses, bacteria, fungi, and protists
Symptoms, spread mechanisms, and treatments vary for each disease
Preventive measures like vaccines and hygiene practices are crucial
Some diseases have no cure but can be managed with medications
Plant diseases can significantly impact crop yields and require specific control measures

08/08/2023

347

Symptoms:
Fever
Red skin
-
Spread:
May cause:
-
-
Inhalation of droplets from
coughs and sneezes, air
droplet particles
Blindness
Measles
Br

View

HIV/AIDS: A Complex Viral Infection

HIV (Human Immunodeficiency Virus) is a virus that attacks the immune system, potentially leading to AIDS (Acquired Immunodeficiency Syndrome) if left untreated.

Symptoms of HIV infection include:

Fever
Fatigue
Headache
Sore throat
Swollen lymph glands
Short-term nausea
Muscular aches and pain
Rash

Vocabulary: HIV stands for Human Immunodeficiency Virus, which targets and weakens the body's immune system.

Transmission occurs through:

Direct sexual contact
Exchange of body fluids

Highlight: HIV hides inside the immune system, gradually damaging it until it can no longer effectively combat infections or cancers.

Treatment and Prevention: While there is no cure for HIV/AIDS, antiretroviral drugs can significantly slow the progression of the disease and prevent the development of AIDS for many years. Currently, there is no vaccine available to prevent HIV infection.

Example: Antiretroviral therapy (ART) is a combination of medications that suppress HIV replication and help maintain a functioning immune system.

View

Tobacco Mosaic Virus: A Plant Pathogen

Tobacco Mosaic Virus (TMV) is a viral plant disease that affects various plant species, particularly tobacco and other members of the Solanaceae family.

Symptoms of TMV infection:

Distinctive 'mosaic' pattern of discoloration on leaves
Stunted growth in infected areas due to impaired photosynthesis

Definition: A mosaic pattern refers to a mottled appearance of light and dark areas on plant leaves, often indicative of viral infection.

Transmission methods:

Contact between diseased and healthy plant material
Insects acting as vectors (carriers) of the virus

Highlight: TMV can remain infectious in plant material for up to 50 years, making it a persistent threat to crop health.

Management and Prevention:

No direct treatment is available for infected plants
Farmers now grow TMV-resistant strains of many crop plants
Good crop hygiene and effective pest control help prevent the spread of TMV

Example: Sanitizing tools and equipment between handling different plants can help reduce the risk of TMV transmission in agricultural settings.

Vocabulary: A vector, in the context of plant diseases, is an organism that transmits a pathogen from one plant to another.

View

Salmonella Food Poisoning: A Bacterial Infection

Salmonella is a bacterial infection that commonly causes food poisoning, with symptoms typically appearing within 8-72 hours of consuming contaminated food.

Key symptoms of Salmonella infection:

Fever
Abdominal cramps
Vomiting
Diarrhoea

Highlight: Salmonella bacteria disrupt the natural gut flora, leading to gastrointestinal distress.

Transmission:

Eating food where bacteria have not been killed by proper heating

Potential complications:

Dehydration, particularly dangerous for the elderly and very young

Example: Undercooked poultry is a common source of Salmonella infection, emphasizing the importance of proper food handling and cooking practices.

Prevention and Control:

No specific treatment once infection occurs; antibiotics are not typically prescribed
In the UK, poultry is vaccinated against Salmonella to control the spread of the disease

Vocabulary: Dehydration is a condition where the body loses more fluids than it takes in, potentially leading to serious health complications if left untreated.

View

Gonorrhea: A Sexually Transmitted Bacterial Infection

Gonorrhea is a communicable disease caused by bacteria and primarily transmitted through sexual contact. It affects both men and women, often with different symptoms.

Common symptoms in men:

Penile discharge (often green or yellow)
Burning or painful urination
Testicular swelling

Common symptoms in women:

Vaginal discharge
Burning or painful urination
Bleeding between periods

Highlight: Many people infected with gonorrhea may not experience noticeable symptoms, making regular testing crucial for sexually active individuals.

Transmission:

Unprotected sexual contact with an infected person

Potential complications:

Pelvic pain
Infertility
Ectopic pregnancies

Definition: An ectopic pregnancy occurs when a fertilized egg implants outside the uterus, typically in a fallopian tube, and can be life-threatening if left untreated.

Treatment and Prevention:

Gonorrhea can be treated with antibiotics, but antibiotic-resistant strains are emerging
No vaccine is available; barrier methods (e.g., condoms) are recommended for prevention

Example: The rise of antibiotic-resistant gonorrhea strains highlights the importance of responsible antibiotic use and the need for new treatment options.

View

Bacterial Diseases in Plants: Crown Gall Disease

Agrobacterium tumefaciens is a bacterium that causes crown gall disease in plants, primarily affecting dicotyledonous species.

Key symptoms:

Crown galls: masses of unspecialized cells that often grow at the joint between the root and shoot of infected plants

Vocabulary: Crown galls are tumor-like growths on plants caused by bacterial infection, disrupting normal plant growth and function.

Characteristics:

Usually found in tropical and subtropical regions
Bacteria insert plasmids into plant cells, causing the growth of genetically modified, undifferentiated cells

Highlight: Agrobacterium tumefaciens has become a valuable tool for scientists in genetic modification of plants due to its natural ability to insert DNA into plant cells.

Scientific applications:

Scientists manipulate the bacteria to carry desirable genes into plant cells for genetic modification purposes

Example: Agrobacterium-mediated transformation is widely used in agricultural biotechnology to develop crops with improved traits such as disease resistance or enhanced nutritional value.

View

Fungal Diseases: Affecting Plants and Humans

Fungal diseases can affect both plants and humans, causing a range of symptoms and potential complications.

Common symptoms in humans:

Irritation
Scaly skin
Redness
Itching
Swelling

Severe fungal infections in humans:

Can attack the lungs or brain in immunocompromised individuals
May develop on damaged heart valves

Highlight: While many fungal infections are superficial, they can become life-threatening in people with weakened immune systems.

Treatment for human fungal infections:

Antifungal drugs are usually effective against skin fungi
Deep-seated tissue infections are more challenging to treat

Fungal diseases in plants:

Common cause of crop loss
Include stem rusts and various rotting diseases

Example: Wheat stem rust is a devastating fungal disease that can cause significant yield losses in wheat crops worldwide.

Vocabulary: Stem rust is a fungal disease that affects cereal crops, causing reddish-brown pustules on stems and leaves, leading to reduced grain quality and yield.

View

Rose Black Spot: A Common Fungal Plant Disease

Rose black spot is a fungal disease that affects roses, causing distinctive symptoms and potentially weakening the plant.

Key symptoms:

Purple or black spots on leaves
Leaves turning yellow and dropping early

Transmission and spread:

Spores carried by wind
Spread over the plant by rain splashing from one leaf to another
Spores remain dormant over winter on dead leaves and stems

Highlight: The disease reduces the area of leaves available for photosynthesis, weakening the plant and affecting its ability to flower well.

Treatment and prevention:

Remove and burn affected leaves and stems to prevent spread
Chemical fungicides can treat the disease and prevent its spread
Some rose varieties have been bred for relative resistance to black spot

Example: Proper pruning and spacing of rose plants can improve air circulation, reducing the likelihood of black spot infection.

Vocabulary: Fungicides are chemical compounds used to kill or inhibit the growth of fungi, often applied to protect plants from fungal diseases.

View

Protist-Caused Diseases: Malaria as a Prime Example

Protists are single-celled organisms that can cause a range of diseases in animals and plants. While relatively rare as pathogens, the diseases they cause can be serious and damaging.

Characteristics of protist-caused diseases:

Often involve a vector that transfers the protist to the host
Malaria is a prime example of a serious protist disease

Definition: A vector is an organism that transmits a disease-causing agent from one host to another, such as mosquitoes in the case of malaria.

General impact of protist infections:

Can affect various organs, including the liver
May damage red blood cells
Often cause fever and weakness over time

Highlight: Protist pathogens that cause diseases like malaria are parasites, living and feeding on other living organisms.

Vocabulary: Parasites are organisms that live in or on a host organism and benefit by deriving nutrients at the host's expense.

View

Malaria: A Complex Protist-Caused Disease

Malaria is a serious and potentially life-threatening disease caused by protist parasites of the Plasmodium genus, transmitted through the bite of infected Anopheles mosquitoes.

Key symptoms and effects:

Fever
Shaking chills (when protists burst out of blood cells)
Progressive weakening of the affected person

Disease mechanism:

Protists damage red blood cells and affect liver function
The parasite's life cycle includes stages in both human and mosquito hosts

Highlight: The complex life cycle of malaria parasites, involving both human and mosquito hosts, makes the disease challenging to control and eradicate.

Transmission:

Female Anopheles mosquitoes act as vectors, transmitting the parasite between human hosts

Example: The use of insecticide-treated bed nets has been an effective measure in reducing malaria transmission in endemic areas.

Vocabulary: Endemic refers to the constant presence of a disease or infectious agent within a given geographic area or population group.

View

Measles: A Highly Contagious Viral Disease

Measles is a communicable disease caused by a virus, characterized by distinct symptoms and a specific mode of transmission.

Symptoms of measles include:

Fever
Red skin rash

The virus spreads through:

Inhalation of droplets from coughs and sneezes
Air droplet particles

Potential complications:

Blindness
Brain damage

Highlight: There is no specific treatment for measles, necessitating isolation of infected individuals to prevent further spread.

Definition: A communicable disease is an illness that can be transmitted from one person to another through various means.

Prevention: A vaccine is available to prevent the spread of measles, making it a crucial tool in public health efforts.

Example: The measles vaccine is typically administered as part of the MMR (Measles, Mumps, Rubella) vaccine in childhood immunization schedules.

Can't find what you're looking for? Explore other subjects.

Knowunity is the #1 education app in five European countries

Knowunity has been named a featured story on Apple and has regularly topped the app store charts in the education category in Germany, Italy, Poland, Switzerland, and the United Kingdom. Join Knowunity today and help millions of students around the world.

Download in

Google Play

Download in

App Store

Knowunity is the #1 education app in five European countries

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Pupils love Knowunity

#1

In education app charts in 12 countries

950 K+

Students have uploaded notes

Still not convinced? See what other students are saying...

iOS User

I love this app so much, I also use it daily. I recommend Knowunity to everyone!!! I went from a D to an A with it :D

Philip, iOS User

The app is very simple and well designed. So far I have always found everything I was looking for :D

Lena, iOS user

I love this app ❤️ I actually use it every time I study.

Subjects

Biology

Infection and response

Plant disease

Symptoms and Spread of Communicable Diseases - GCSE Biology AQA

Imy

@studywithimy

689 Followers

Communicable Diseases: Symptoms, Spread, and Treatment

Key points:

Diseases are caused by different pathogens: viruses, bacteria, fungi, and protists
Symptoms, spread mechanisms, and treatments vary for each disease
Preventive measures like vaccines and hygiene practices are crucial
Some diseases have no cure but can be managed with medications
Plant diseases can significantly impact crop yields and require specific control measures

08/08/2023

347

10/11

Biology

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HIV/AIDS: A Complex Viral Infection

HIV (Human Immunodeficiency Virus) is a virus that attacks the immune system, potentially leading to AIDS (Acquired Immunodeficiency Syndrome) if left untreated.

Symptoms of HIV infection include:

Fever
Fatigue
Headache
Sore throat
Swollen lymph glands
Short-term nausea
Muscular aches and pain
Rash

Vocabulary: HIV stands for Human Immunodeficiency Virus, which targets and weakens the body's immune system.

Transmission occurs through:

Direct sexual contact
Exchange of body fluids

Highlight: HIV hides inside the immune system, gradually damaging it until it can no longer effectively combat infections or cancers.

Example: Antiretroviral therapy (ART) is a combination of medications that suppress HIV replication and help maintain a functioning immune system.

Sign up to see the content. It's free!

Access to all documents

Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Tobacco Mosaic Virus: A Plant Pathogen

Tobacco Mosaic Virus (TMV) is a viral plant disease that affects various plant species, particularly tobacco and other members of the Solanaceae family.

Symptoms of TMV infection:

Distinctive 'mosaic' pattern of discoloration on leaves
Stunted growth in infected areas due to impaired photosynthesis

Definition: A mosaic pattern refers to a mottled appearance of light and dark areas on plant leaves, often indicative of viral infection.

Transmission methods:

Contact between diseased and healthy plant material
Insects acting as vectors (carriers) of the virus

Highlight: TMV can remain infectious in plant material for up to 50 years, making it a persistent threat to crop health.

Management and Prevention:

No direct treatment is available for infected plants
Farmers now grow TMV-resistant strains of many crop plants
Good crop hygiene and effective pest control help prevent the spread of TMV

Example: Sanitizing tools and equipment between handling different plants can help reduce the risk of TMV transmission in agricultural settings.

Vocabulary: A vector, in the context of plant diseases, is an organism that transmits a pathogen from one plant to another.

Sign up to see the content. It's free!

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Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Salmonella Food Poisoning: A Bacterial Infection

Salmonella is a bacterial infection that commonly causes food poisoning, with symptoms typically appearing within 8-72 hours of consuming contaminated food.

Key symptoms of Salmonella infection:

Fever
Abdominal cramps
Vomiting
Diarrhoea

Highlight: Salmonella bacteria disrupt the natural gut flora, leading to gastrointestinal distress.

Transmission:

Eating food where bacteria have not been killed by proper heating

Potential complications:

Dehydration, particularly dangerous for the elderly and very young

Example: Undercooked poultry is a common source of Salmonella infection, emphasizing the importance of proper food handling and cooking practices.

Prevention and Control:

No specific treatment once infection occurs; antibiotics are not typically prescribed
In the UK, poultry is vaccinated against Salmonella to control the spread of the disease

Vocabulary: Dehydration is a condition where the body loses more fluids than it takes in, potentially leading to serious health complications if left untreated.

Sign up to see the content. It's free!

Access to all documents

Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Gonorrhea: A Sexually Transmitted Bacterial Infection

Gonorrhea is a communicable disease caused by bacteria and primarily transmitted through sexual contact. It affects both men and women, often with different symptoms.

Common symptoms in men:

Penile discharge (often green or yellow)
Burning or painful urination
Testicular swelling

Common symptoms in women:

Vaginal discharge
Burning or painful urination
Bleeding between periods

Highlight: Many people infected with gonorrhea may not experience noticeable symptoms, making regular testing crucial for sexually active individuals.

Transmission:

Unprotected sexual contact with an infected person

Potential complications:

Pelvic pain
Infertility
Ectopic pregnancies

Definition: An ectopic pregnancy occurs when a fertilized egg implants outside the uterus, typically in a fallopian tube, and can be life-threatening if left untreated.

Treatment and Prevention:

Gonorrhea can be treated with antibiotics, but antibiotic-resistant strains are emerging
No vaccine is available; barrier methods (e.g., condoms) are recommended for prevention

Example: The rise of antibiotic-resistant gonorrhea strains highlights the importance of responsible antibiotic use and the need for new treatment options.

Sign up to see the content. It's free!

Access to all documents

Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Bacterial Diseases in Plants: Crown Gall Disease

Agrobacterium tumefaciens is a bacterium that causes crown gall disease in plants, primarily affecting dicotyledonous species.

Key symptoms:

Crown galls: masses of unspecialized cells that often grow at the joint between the root and shoot of infected plants

Vocabulary: Crown galls are tumor-like growths on plants caused by bacterial infection, disrupting normal plant growth and function.

Characteristics:

Usually found in tropical and subtropical regions
Bacteria insert plasmids into plant cells, causing the growth of genetically modified, undifferentiated cells

Highlight: Agrobacterium tumefaciens has become a valuable tool for scientists in genetic modification of plants due to its natural ability to insert DNA into plant cells.

Scientific applications:

Scientists manipulate the bacteria to carry desirable genes into plant cells for genetic modification purposes

Example: Agrobacterium-mediated transformation is widely used in agricultural biotechnology to develop crops with improved traits such as disease resistance or enhanced nutritional value.

Sign up to see the content. It's free!

Access to all documents

Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Fungal Diseases: Affecting Plants and Humans

Fungal diseases can affect both plants and humans, causing a range of symptoms and potential complications.

Common symptoms in humans:

Irritation
Scaly skin
Redness
Itching
Swelling

Severe fungal infections in humans:

Can attack the lungs or brain in immunocompromised individuals
May develop on damaged heart valves

Highlight: While many fungal infections are superficial, they can become life-threatening in people with weakened immune systems.

Treatment for human fungal infections:

Antifungal drugs are usually effective against skin fungi
Deep-seated tissue infections are more challenging to treat

Fungal diseases in plants:

Common cause of crop loss
Include stem rusts and various rotting diseases

Example: Wheat stem rust is a devastating fungal disease that can cause significant yield losses in wheat crops worldwide.

Vocabulary: Stem rust is a fungal disease that affects cereal crops, causing reddish-brown pustules on stems and leaves, leading to reduced grain quality and yield.

Sign up to see the content. It's free!

Access to all documents

Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Rose Black Spot: A Common Fungal Plant Disease

Rose black spot is a fungal disease that affects roses, causing distinctive symptoms and potentially weakening the plant.

Key symptoms:

Purple or black spots on leaves
Leaves turning yellow and dropping early

Transmission and spread:

Spores carried by wind
Spread over the plant by rain splashing from one leaf to another
Spores remain dormant over winter on dead leaves and stems

Highlight: The disease reduces the area of leaves available for photosynthesis, weakening the plant and affecting its ability to flower well.

Treatment and prevention:

Remove and burn affected leaves and stems to prevent spread
Chemical fungicides can treat the disease and prevent its spread
Some rose varieties have been bred for relative resistance to black spot

Example: Proper pruning and spacing of rose plants can improve air circulation, reducing the likelihood of black spot infection.

Vocabulary: Fungicides are chemical compounds used to kill or inhibit the growth of fungi, often applied to protect plants from fungal diseases.

Sign up to see the content. It's free!

Access to all documents

Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Protist-Caused Diseases: Malaria as a Prime Example

Protists are single-celled organisms that can cause a range of diseases in animals and plants. While relatively rare as pathogens, the diseases they cause can be serious and damaging.

Characteristics of protist-caused diseases:

Often involve a vector that transfers the protist to the host
Malaria is a prime example of a serious protist disease

Definition: A vector is an organism that transmits a disease-causing agent from one host to another, such as mosquitoes in the case of malaria.

General impact of protist infections:

Can affect various organs, including the liver
May damage red blood cells
Often cause fever and weakness over time

Highlight: Protist pathogens that cause diseases like malaria are parasites, living and feeding on other living organisms.

Vocabulary: Parasites are organisms that live in or on a host organism and benefit by deriving nutrients at the host's expense.

Sign up to see the content. It's free!

Access to all documents

Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Malaria: A Complex Protist-Caused Disease

Malaria is a serious and potentially life-threatening disease caused by protist parasites of the Plasmodium genus, transmitted through the bite of infected Anopheles mosquitoes.

Key symptoms and effects:

Fever
Shaking chills (when protists burst out of blood cells)
Progressive weakening of the affected person

Disease mechanism:

Protists damage red blood cells and affect liver function
The parasite's life cycle includes stages in both human and mosquito hosts

Highlight: The complex life cycle of malaria parasites, involving both human and mosquito hosts, makes the disease challenging to control and eradicate.

Transmission:

Female Anopheles mosquitoes act as vectors, transmitting the parasite between human hosts

Example: The use of insecticide-treated bed nets has been an effective measure in reducing malaria transmission in endemic areas.

Vocabulary: Endemic refers to the constant presence of a disease or infectious agent within a given geographic area or population group.

Sign up to see the content. It's free!

Access to all documents

Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Measles: A Highly Contagious Viral Disease

Measles is a communicable disease caused by a virus, characterized by distinct symptoms and a specific mode of transmission.

Symptoms of measles include:

Fever
Red skin rash

The virus spreads through:

Inhalation of droplets from coughs and sneezes
Air droplet particles

Potential complications:

Blindness
Brain damage

Highlight: There is no specific treatment for measles, necessitating isolation of infected individuals to prevent further spread.

Definition: A communicable disease is an illness that can be transmitted from one person to another through various means.

Prevention: A vaccine is available to prevent the spread of measles, making it a crucial tool in public health efforts.

Example: The measles vaccine is typically administered as part of the MMR (Measles, Mumps, Rubella) vaccine in childhood immunization schedules.

Can't find what you're looking for? Explore other subjects.

Knowunity is the #1 education app in five European countries

Knowunity has been named a featured story on Apple and has regularly topped the app store charts in the education category in Germany, Italy, Poland, Switzerland, and the United Kingdom. Join Knowunity today and help millions of students around the world.

Download in

Google Play

Download in

App Store

4.9+

Average app rating

15 M

Pupils love Knowunity

#1

In education app charts in 12 countries

950 K+

Students have uploaded notes

Still not convinced? See what other students are saying...

iOS User

I love this app so much, I also use it daily. I recommend Knowunity to everyone!!! I went from a D to an A with it :D

Philip, iOS User

The app is very simple and well designed. So far I have always found everything I was looking for :D

Lena, iOS user

Symptoms and Spread of Communicable Diseases - GCSE Biology AQA

HIV/AIDS: A Complex Viral Infection

Tobacco Mosaic Virus: A Plant Pathogen

Salmonella Food Poisoning: A Bacterial Infection

Gonorrhea: A Sexually Transmitted Bacterial Infection

Bacterial Diseases in Plants: Crown Gall Disease

Fungal Diseases: Affecting Plants and Humans

Rose Black Spot: A Common Fungal Plant Disease

Protist-Caused Diseases: Malaria as a Prime Example

Malaria: A Complex Protist-Caused Disease

Measles: A Highly Contagious Viral Disease

Similar content

Can't find what you're looking for? Explore other subjects.

Knowunity is the #1 education app in five European countries

Knowunity has been named a featured story on Apple and has regularly topped the app store charts in the education category in Germany, Italy, Poland, Switzerland, and the United Kingdom. Join Knowunity today and help millions of students around the world.

4.9+

15 M

#1

950 K+

Still not convinced? See what other students are saying...

I love this app so much, I also use it daily. I recommend Knowunity to everyone!!! I went from a D to an A with it :D

The app is very simple and well designed. So far I have always found everything I was looking for :D

I love this app ❤️ I actually use it every time I study.

Symptoms and Spread of Communicable Diseases - GCSE Biology AQA

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HIV/AIDS: A Complex Viral Infection

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Tobacco Mosaic Virus: A Plant Pathogen

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Salmonella Food Poisoning: A Bacterial Infection

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Gonorrhea: A Sexually Transmitted Bacterial Infection

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Bacterial Diseases in Plants: Crown Gall Disease

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Fungal Diseases: Affecting Plants and Humans

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Rose Black Spot: A Common Fungal Plant Disease

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Protist-Caused Diseases: Malaria as a Prime Example

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Malaria: A Complex Protist-Caused Disease

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Measles: A Highly Contagious Viral Disease

Similar content

Can't find what you're looking for? Explore other subjects.

Knowunity is the #1 education app in five European countries

Knowunity has been named a featured story on Apple and has regularly topped the app store charts in the education category in Germany, Italy, Poland, Switzerland, and the United Kingdom. Join Knowunity today and help millions of students around the world.

4.9+

15 M

#1

950 K+

Still not convinced? See what other students are saying...

I love this app so much, I also use it daily. I recommend Knowunity to everyone!!! I went from a D to an A with it :D

The app is very simple and well designed. So far I have always found everything I was looking for :D

I love this app ❤️ I actually use it every time I study.