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Dec 2, 2025

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Understanding Communicable Diseases

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e @uwu_fpjs

Communicable diseases are illnesses that can spread from person to person through different methods. These diseases are caused... Show more

Communicable diseases
A communicable disease is a disease that can be passed on person to person using
different methods. E.g. common cold,

Communicable Diseases and Their Causes

Ever wondered how you catch a cold? Communicable diseases pass from person to person through various routes. These illnesses can be caused by different types of pathogens that attack our bodies in unique ways.

Viruses are tiny invaders about 100,000 times smaller than bacteria. Unlike bacteria, all viruses are harmful. They invade your cells, multiply inside them, and eventually cause the cells to burst and die. This releases more viruses that attack other cells, continuing the destructive cycle. You often catch viral infections through the air when someone coughs, sneezes, or even talks.

Bacteria come in both helpful and harmful varieties. Good bacteria help maintain your health, treat sewage, and produce medicines and food. They're also vital decomposers in the environment. Harmful bacteria are pathogens that produce toxins as they divide through binary fission, damaging your cells directly. Bacterial infections like gonorrhoea spread through direct contact between people.

Health Alert Gonorrhoea is a bacterial infection of the sexual organs. You can reduce your risk by avoiding contact with infected sex organs and using protection. If infected, antibiotics can treat the disease.

Diseases spread through three main routes direct contact (through infected plants, sexual contact, cuts, or animal vectors), water (contaminated food or water entering through the digestive system), and air (breathing in pathogens expelled when people cough, sneeze, or talk).

We thought you’d never ask...

What is the Knowunity AI companion?

Our AI companion is specifically built for the needs of students. Based on the millions of content pieces we have on the platform we can provide truly meaningful and relevant answers to students. But its not only about answers, the companion is even more about guiding students through their daily learning challenges, with personalised study plans, quizzes or content pieces in the chat and 100% personalisation based on the students skills and developments.

Where can I download the Knowunity app?

You can download the app in the Google Play Store and in the Apple App Store.

Is Knowunity really free of charge?

That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.

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iOS user

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Food & Nutrition

390

Dec 2, 2025

1 page

Understanding Communicable Diseases

user profile picture

e

@uwu_fpjs

Communicable diseases are illnesses that can spread from person to person through different methods. These diseases are caused by various pathogens, including viruses, bacteria, fungi, and protists, and understanding how they spread is crucial for preventing infections.

Communicable diseases
A communicable disease is a disease that can be passed on person to person using
different methods. E.g. common cold,

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Communicable Diseases and Their Causes

Ever wondered how you catch a cold? Communicable diseases pass from person to person through various routes. These illnesses can be caused by different types of pathogens that attack our bodies in unique ways.

Viruses are tiny invaders about 100,000 times smaller than bacteria. Unlike bacteria, all viruses are harmful. They invade your cells, multiply inside them, and eventually cause the cells to burst and die. This releases more viruses that attack other cells, continuing the destructive cycle. You often catch viral infections through the air when someone coughs, sneezes, or even talks.

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Health Alert: Gonorrhoea is a bacterial infection of the sexual organs. You can reduce your risk by avoiding contact with infected sex organs and using protection. If infected, antibiotics can treat the disease.

Diseases spread through three main routes: direct contact (through infected plants, sexual contact, cuts, or animal vectors), water (contaminated food or water entering through the digestive system), and air (breathing in pathogens expelled when people cough, sneeze, or talk).

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What is the Knowunity AI companion?

Our AI companion is specifically built for the needs of students. Based on the millions of content pieces we have on the platform we can provide truly meaningful and relevant answers to students. But its not only about answers, the companion is even more about guiding students through their daily learning challenges, with personalised study plans, quizzes or content pieces in the chat and 100% personalisation based on the students skills and developments.

Where can I download the Knowunity app?

You can download the app in the Google Play Store and in the Apple App Store.

Is Knowunity really free of charge?

That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.

7

Smart Tools NEW

Transform this note into: ✓ 50+ Practice Questions ✓ Interactive Flashcards ✓ Full Mock Exam ✓ Essay Outlines

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Flashcards
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Explore Freud's psychodynamic theory of criminality, focusing on the tripartite model of personality: id, ego, and superego. Understand how unconscious drives and early childhood experiences influence behavior and the potential for criminality. This summary provides key insights into the role of the unconscious mind and the implications of a weak superego in criminal behavior.

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Samantha Klich

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David K

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Sudenaz Ocak

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Greenlight Bonnie

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I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend

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Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀

Marco B

iOS user

THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮

Elisha

iOS user

This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!

Paul T

iOS user

The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.

Stefan S

iOS user

This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.

Samantha Klich

Android user

Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.

Anna

iOS user

I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️

Thomas R

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Brad T

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David K

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Greenlight Bonnie

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Marco B

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THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮

Elisha

iOS user

This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!

Paul T

iOS user