These are the Most Contagious Diseases on Earth

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Many illnesses are contagious, but some are so contagious that one person having it almost guarantees that multiple others will also get it. These are the most contagious diseases you’ll ever encounter.
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Leprosy

Leprosy isn’t as common as it once was due to better hygiene and sanitation, but it is highly contagious and can lead to major health complications when it spreads.
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Rabies

Rabies can’t be spread from person to person, but it is highly contagious with contact with an animal that has it.
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Malaria

Malaria is contracted from mosquitos, which is why it is so contagious. It can lead to death in many people.
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Smallpox

Fortunately, this disease has almost been eradicated, but it spreads like wildfire and usually results in death. Most countries vaccinate for the disease.
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Bubonic Plague

There have been many historical instances of the plague tearing through a community and killing almost everyone in its wake. It’s not as common today, but still just as contagious.
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Influenza

Also known as the flu, this disease is super contagious and can be deadly to young kids, older people and those with compromised immune systems.
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Typhoid Fever

Typhoid fever isn’t as highly dangerous as the other diseases on this list, but it is very contagious because it is transmitted before a person knows he has it.
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HIV

Luckily, most countries have a handle of HIV transmission through education, but it is very contagious through sexual contact, exchange of bodily fluids and sharing drug paraphernalia.
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Ringworm

This skin disease can easily be passed through skin to skin contact as well as sharing towels and clothing.
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Giardiasis

This parasite infects the water supply and can spread from person to person with poor hand washing techniques. It causes severe digestive disturbances and can be hard to treat.
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