Yellow: Difference between revisions

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'''Yellow fever''' is an acute viral disease. It is known to be caused by the [[Yellow fever virus]] and is spread through the bite of an infected female mosquito. Yellow fever can lead to serious illness and even death. It is named for the jaundice that affects some patients.
{{short description|Color}}
{{other uses}}


== Symptoms and Transmission ==
[[File:CMYK_color_swatches.svg|thumb|right|Yellow in the CMYK color model]]


[[Symptoms]] of yellow fever include fever, headache, jaundice, muscle pain, nausea, vomiting and fatigue. A small proportion of patients who contract the virus develop severe symptoms and approximately half of those die within 7 to 10 days.
'''Yellow''' is the color between [[orange (color)|orange]] and [[green]] on the spectrum of visible light. It is evoked by light with a dominant wavelength of roughly 570–590 nanometers. It is a primary color in subtractive color systems, used in color printing. In the [[RGB color model]], used to create colors on television and computer screens, yellow is a secondary color made by combining red and green at equal intensity.


The [[virus]] is endemic in tropical areas of Africa and Central and South America. Large [[epidemics]] of yellow fever occur when infected people introduce the virus into heavily populated areas with high mosquito density and where most people have little or no immunity, due to lack of vaccination. In these conditions, infected mosquitoes transmit the virus from person to person.
==Etymology==
The word "yellow" comes from the Old English "geolu," which is derived from the Proto-Germanic "gelwaz." The term has been used in the English language since the 14th century.


== Prevention and Control ==
==Color science==
[[File:SubtractiveColor.svg|thumb|left|Yellow in the subtractive color model]]
In the [[subtractive color]] model, used in color printing, yellow is one of the three primary colors, along with cyan and magenta. When combined with cyan, it produces green, and when combined with magenta, it produces red. In the [[additive color]] model, yellow is created by combining red and green light.


[[Vaccination]] is the most important means of preventing yellow fever. The yellow fever vaccine is safe, affordable and a single dose provides life-long protection against yellow fever disease. A booster dose of yellow fever vaccine is not needed.
==Perception==
Yellow is perceived as a bright and cheerful color. It is often associated with sunshine, warmth, and happiness. However, it can also be associated with caution and cowardice.


Other preventive measures against yellow fever include using insect repellent, wearing protective clothing, and getting rid of potential mosquito breeding sites.
==Cultural associations==
Yellow has various cultural meanings around the world. In many Asian cultures, it is associated with royalty and prosperity. In Western cultures, it is often associated with caution, as seen in yellow traffic lights and warning signs.


== Treatment ==
==Natural occurrences==
[[File:Fall_colors_near_the_Eagle_Lake_trailhead.jpg|thumb|right|Yellow leaves in autumn]]
Yellow is a common color in nature, seen in flowers such as [[daffodil]]s and sunflowers, and in fruits like [[banana]]s and lemons. In autumn, many leaves turn yellow as chlorophyll breaks down.


Good and early supportive treatment in hospitals improves survival rates. There is currently no specific anti-viral drug for yellow fever but specific care to treat dehydration, liver and kidney failure, and fever improves outcomes.
==Pigments and dyes==
Historically, yellow pigments were made from natural sources such as ochre and saffron. Modern yellow pigments include cadmium yellow and chrome yellow.


== See Also ==
==Uses==
Yellow is used in various applications, from art and design to safety and transportation. It is a popular color for highlighting text and is used in high-visibility clothing and equipment.


* [[Dengue fever]]
==Related pages==
* [[Zika virus]]
* [[Color theory]]
* [[Malaria]]
* [[Primary color]]
* [[Subtractive color]]
* [[Additive color]]


== References ==
[[Category:Colors]]
 
<references />
 
[[Category:Viral diseases]]
[[Category:Tropical diseases]]
[[Category:Health in Africa]]
[[Category:Health in South America]]
 
{{stub}}
<gallery>
File:CMYK_color_swatches.svg|Yellow
File:SubtractiveColor.svg|Yellow
File:NIEdot367.jpg|Yellow
File:Red_and_green_make_yellow.png|Yellow
File:PlanckianLocusWithYellowComplements.png|Yellow
File:Fall_colors_near_the_Eagle_Lake_trailhead.jpg|Yellow
File:Cornwall_Daffodils.jpg|Yellow
File:Bananas.jpg|Yellow
File:Raw_egg.jpg|Yellow
File:Duckling_chicks_(Unsplash).jpg|Yellow
File:European_wasp_white_bg.jpg|Yellow
File:Snowbowlaspens.jpg|Yellow
</gallery>

Latest revision as of 11:16, 23 March 2025

Color


Yellow in the CMYK color model

Yellow is the color between orange and green on the spectrum of visible light. It is evoked by light with a dominant wavelength of roughly 570–590 nanometers. It is a primary color in subtractive color systems, used in color printing. In the RGB color model, used to create colors on television and computer screens, yellow is a secondary color made by combining red and green at equal intensity.

Etymology[edit]

The word "yellow" comes from the Old English "geolu," which is derived from the Proto-Germanic "gelwaz." The term has been used in the English language since the 14th century.

Color science[edit]

Yellow in the subtractive color model

In the subtractive color model, used in color printing, yellow is one of the three primary colors, along with cyan and magenta. When combined with cyan, it produces green, and when combined with magenta, it produces red. In the additive color model, yellow is created by combining red and green light.

Perception[edit]

Yellow is perceived as a bright and cheerful color. It is often associated with sunshine, warmth, and happiness. However, it can also be associated with caution and cowardice.

Cultural associations[edit]

Yellow has various cultural meanings around the world. In many Asian cultures, it is associated with royalty and prosperity. In Western cultures, it is often associated with caution, as seen in yellow traffic lights and warning signs.

Natural occurrences[edit]

Yellow leaves in autumn

Yellow is a common color in nature, seen in flowers such as daffodils and sunflowers, and in fruits like bananas and lemons. In autumn, many leaves turn yellow as chlorophyll breaks down.

Pigments and dyes[edit]

Historically, yellow pigments were made from natural sources such as ochre and saffron. Modern yellow pigments include cadmium yellow and chrome yellow.

Uses[edit]

Yellow is used in various applications, from art and design to safety and transportation. It is a popular color for highlighting text and is used in high-visibility clothing and equipment.

Related pages[edit]