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Dig into the history of pandemics to learn how viruses and disease spreads and what we can do to stop future outbreaks.

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In our increasingly globalized world, a single infected person can board a plane and spread a virus across continents. Mark Honigsbaum describes the history of pandemics and how that knowledge can help halt future outbreaks.

Lesson by Mark Honigsbaum, directed by Patrick Blower.

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Pathogens are disease causing microorganisms.

They can be spread in many ways; by direct contact, by water or by air. Different pathogens are spread by different mechanisms.

How can transmission be reduced or prevented?
Depending upon which disease you are trying to reduce transmission for, depends upon which methods you need to engage.

Simple hygiene measures can reduce or prevent the spread of many diseases, including flu and the common cold.

To reduce or prevent cholera and other diarrhoea causing pathogens, communities need access to safe drinking water, adequate sanitation so that dirty water is not exposed and basic hygiene needs such as washing hands properly, boil water properly and keep surfaces clean.

Malaria and yellow fever both have mosquitos as their vector, and lyme disease uses ticks. A vector is an organism that has an active role in transmitting pathogens from one host to another. To prevent or reduce infection from vector borne diseases, the vectors need to be controlled or humans protected against the vector such as wearing mosquito repellent and wearing long sleeved clothing. Insecticide and spraying techniques can be used to reduce the populations of the vectors, but this is trickier and more expensive.

If a disease is highly contagious, such as rabies, people may need to be isolated to prevent the infection spreading to others.

Vaccinations are also an option for preventing and reducing pathogens. Vaccinations involve putting a small amount of inactive or dead pathogen into the body, which stimulates the body to produce antibodies against the specific pathogen. This enables the body to be prepared to attack and destroy this pathogen if they are infected in future.

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“Although the environment around an organism changes, the organism maintains relatively stable internal conditions. This ability to maintain internal stability, called homeostasis.

For example if a person stands in a cold wintery night or hot sub sahran africn weather , the person is able to maintain a normal internal body temperature 36-37C (97-99F) through homeostasis.
The main mechanism to maintain a homestatic environment is through negative feedback. Negative feedback is where the body senses change and activated mechanisms that negate or reverse it.”

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Explore homeostasis with the Amoeba Sisters and learn how homeostasis relates to feedback in the human body. This video gives examples of negative feedback (temperature and blood glucose regulation) and positive feedback (events in childbirth). Handout available here: http://www.amoebasisters.com/handouts See table of contents below 👇

Table of Contents:
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Homeostasis 0:21
Negative Feedback (and how this keeps homeostasis) 1:50
Positive Feedback 4:05

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-Black people in about every state with racial data available have higher contraction rates and higher death rates from COVID-19. Those numbers could be about more than following the rules of social distancing.

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This video “Bacterial Meningitis (CNS Infection)” is part of the Lecturio course “Infectious Diseases” ► WATCH the complete course on http://lectur.io/bacterialmeningitiscnsinfection

► LEARN ABOUT:
– Neisseria Meningitidis (Meningococcus): Signs & Symptoms
– Streptococcus Agalactiae
– Bacterial Meningitis: Diagnosis & CSF Findings
– CSF CSF Graim’s
– CSF Rapid Tests
– Bacterial Meningitis: Management & Empirical Treatment When Gram’s Stain
– Bacterial Meningitis: Prognosis
– Bacterial Meningitis: Etiology & MCV-4 Meningococcal Vaccine

► THE PROF: Your tutor is Dr. John Fisher, who is certified by the American Board of Internal Medicine in both Medicine and Infectious Diseases. In his 30 years on the faculty of the Medical College of Georgia he has received multiple awards for his excellent teaching. Dr. Fisher is also the author of 61 original publications in refereed journals and 44 book chapters.

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Study for your classes, USMLE Step 1, USMLE Step 2, MCAT or MBBS with video lectures by world-class professors, recall & USMLE-style questions and textbook articles. Create your free account now: http://lectur.io/bacterialmeningitiscnsinfection

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Learn about infection control techniques and how to properly wash your hands to prevent the spread of infections.
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Dirty towels can carry a huge variety of microbes, and they’ve even been linked to spreading infectious disease. You can’t keep your towels 100% germ-free, experts say, but you can limit the grossest ones by washing your towels—only way more often than you probably do now.
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Your Towels Are Way Dirtier Than You Think & You Should Probably Wash Them More Often | TIME
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Practicing hand hygiene, correct cough etiquette, physical distancing and knowing your symptoms are among the main ways people can protect themselves from COVID-19. The creators of the Mr Bean animated character are lending their support to the World Health Organization to raise awareness on these simple yet essential measures to prevent infection from the new virus.

More information: www.who.int/COVID-19

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Lesson on Hepatic Stigmata and the clinical signs and symptoms of liver disease including cirrhosis and hepatitis. The liver has many critical functions for maintaining health and well-being. If liver function is impaired, many signs and symptoms (stigmata) can occur.

In this lesson, you will learn a list of clinical signs and symptoms of hepatic (liver) disease, and you will also learn why these signs and symptoms occur and the pathogenesis surrounding these clinical issues.

If you found this video helpful, please like and subscribe for more videos like this one 🙂

JJ

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Check out some of my other lessons.

Medical Terminology – The Basics – Lesson 1:

Fatty Acid Synthesis Pathway:

Wnt/B Catenin Signaling Pathway:

Upper vs. Lower Motor Neuron Lesions:

Lesson on the Purine Synthesis and Salvage Pathway:

Gastrulation | Formation of Germ Layers:

Introductory lesson on Autophagy (Macroautophagy):

Infectious Disease Playlist

Dermatology Playlist

Pharmacology Playlist

Hematology Playlist

Rheumatology Playlist

Endocrinology Playlist

Nephrology Playlist

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**MEDICAL DISCLAIMER**: JJ Medicine does not provide medical advice, and the information available on this channel does not offer a diagnosis or advice regarding treatment. Information presented in these lessons is for educational purposes ONLY, and information presented here is not to be used as an alternative to a healthcare professional’s diagnosis and treatment of any person/animal.

Only a physician or other licensed healthcare professional are able to determine the requirement for medical assistance to be given to a patient. Please seek the advice of your physician or other licensed healthcare provider if you have any questions regarding a medical condition.

—————————————————————————————————-

*Although I try my best to present accurate information, there may be mistakes in this video. If you do see any mistakes with information in this lesson, please comment and let me know.*

I am always looking for ways to improve my lessons! Please don’t hesitate to leave me feedback and comments – all of your feedback is greatly appreciated! 🙂 And please don’t hesitate to send me any messages if you need any help – I will try my best to be here to help you guys 🙂

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JJ
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“Dr. Oz Show” host Mehmet Oz joins TODAY to take a closer look at where germs lurk in your home, from your pets’ bowls to your dish sponges. He also reveals how dirty smartphones can be by swabbing the TODAY anchors’ phones!
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Dr. Oz Reveals Where Germs Lurk: Pet Bowls, Sponges, Cellphones | TODAY
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Many of us take our phones with us wherever we go, including the bathroom. We were curious how this affected the phones, and if there could be any bacteria, pathogens, or anything else on them.

We sampled 19 phones for bacteria and brought them to Dr. Susan Whittier — Director of Microbiology at the NewYork-Presbyterian/Columbia University Medical Center. Here are the results.

Disclaimer: Our results are from a small, selective sample and do not necessarily apply to the general population.

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This video is a brief overview of Infectious Diseases. We will take a look at what they are, some terms used to describe characteristics of infectious diseases and different types. Historically, infectious diseases were the main cause of deaths around the world. Even now, they are a significant global public health issue leading to millions of deaths each year.

This video was created by Ranil Appuhamy
Voiceover – James Clark

For more information about infectious diseases, have a look at these websites:

http://www.who.int/topics/infectious_diseases/en/
https://www.cdc.gov/diseasesconditions/
https://wwwnc.cdc.gov/eid/

——————————————————————————————————–
Disclaimer:
These videos are provided for educational purposes only. Users should not rely solely on the information contained within these videos and is not intended to be a substitute for advice from other relevant sources. The author/s do not warrant or represent that the information contained in the videos are accurate, current or complete and do not accept any legal liability or responsibility for any loss, damages, costs or expenses incurred by the use of, or reliance on, or interpretation of, the information contained in the videos.
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Aetiology of disease caused by external factors.
The cause of a disease is correctly described as the aetiology. Aetiology is ‘that which causes’. Factors which may be involved in disease causation are therefore termed aetiological factors. So the aetiology causes the pathophysiology which in turn generates the clinical features of the disease. Aetiological factors may arise from within the individual, or from the environment the person is exposed to. Factors arising from within are called endogenous; those from the environment are exogenous.
Any factor from the environment which contributes to disease aetiology is exogenous. These factors are also commonly referred to as environmental. This environment includes the one experienced in the uterus, before birth.

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Dr. Nipunie Rajapakse discusses COVID-19 and social distancing

Visit us (http://www.khanacademy.org/science/healthcare-and-medicine) for health and medicine content or (http://www.khanacademy.org/test-prep/mcat) for MCAT related content. These videos do not provide medical advice and are for informational purposes only. The videos are not intended to be a substitute for professional medical advice, diagnosis or treatment. Always seek the advice of a qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read or seen in any Khan Academy video. Created by Vishal Punwani.

Watch the next lesson: https://www.khanacademy.org/test-prep/nclex-rn/rn-infectious-diseases/rn-hiv-and-aids/v/how-hiv-infects-us-mucous-membranes-dendritic-cells-and-lymph-nodes?utm_source=YT&utm_medium=Desc&utm_campaign=Nclex-rn

Missed the previous lesson? https://www.khanacademy.org/test-prep/nclex-rn/rn-infectious-diseases/rn-hiv-and-aids/v/how-hiv-infects-us-mucous-membranes-dendritic-cells-and-lymph-nodes?utm_source=YT&utm_medium=Desc&utm_campaign=Nclex-rn

NCLEX-RN on Khan Academy: A collection of questions from content covered on the NCLEX-RN. These questions are available under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 United States License (available at http://creativecommons.org/licenses/by-nc-sa/3.0/us/).

About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We’ve also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content.

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